The New Nvidia 6800 Ultra DDL Graphics Card
Dr. q00p writes "Since Apple doesn't offer much information on the new Nvidia 6800 Ultra DDL graphics card (and NVIDIA even less) which is required to drive the new 30-inch Cinema HD Display the readers of Slashdot might be interested to read a reply from Ujesh Desai, Nvidia's General Manager of Desktop GPUs, to a series of questions from Accelerate Your Mac."
Reading that "interview" I can almost see the lawyer going over every answer and neutering it before it went out. Either that or Mr Desai is the most boring and lifeless fellow in the history of electronics.
Hank! White!
Also, I liked this:
* Do you have any idea how performance compares on the Mac between the GeForce 6800 Ultra and the ATI 9800 Pro/XT card?
GeForce 6800 Ultra represents the largest leap forward in graphics performance in our company's history. As expected, they are much faster than previous generation products from ATI. We will let the benchmarks speak for themselves.
Translated: We'll release some actual numbers when we sell more of these mini-space heaters.
I felt the same just now... until I learned of the limit between clicking "reply" and "submit" ;)
Oh well... leave the idiotic first postings to the NGAA or whatever they call themselves. Insightful/Informative/Interesting first posts are much more... valuable.
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more than some PCs. Amazing!
:)
From the site:
"The combination of a GeForce 6800 Ultra with a dual processor Power Mac G5 driving two 30-inch Apple Cinema HD Displays is the definitive tool for the creative professional."
Yes because I need 2 30" screens to watch Carrie Ann Moss on one screen and Natalie Portman on the other
Are these Cinema Displays essentially a dual-monitor-in-one setup (from the computer's POV, that is.)
(YFI, BTW)
One man's -1 Flamebait is another man's +5 Funny.
It won't replace my S3 - 1 meg
Never..
Never......
Never !!!!
As expected, they are much faster than previous generation products from ATI
Thats basically like saying "Hey, this new souped Mustang is much faster than a 1992 Taurus!"
I mean, it better be whole hell of a lot faster than the old cards for the huge premium you are paying right now.
All I know is that the 6800 won't in in my iMac, or (soon to arrive) PowerBook ..... Damn you nVidia!
Slightly off topic, has anyone seen a way to upgrade (even if it includes needed a new case) the video card on an iMac? (lamp type)
Q & A with Nvidia on the Mac
Nvidia 6800 Ultra DDL Graphics card
Posted: 7/20/2004
Shortly after Apple announced the Mac Nvidia 6800 Ultra DDL card for the PowerMac G5s (which is required to drive the 30in Cinema Display), I sent a series of questions to a contact at Nvidia on the card. Yesterday I received the reply from Ujesh Desai, Nvidia's General Manager of Desktop GPUs. Although some questions didn't get as complete an answer as I hoped (often due to the fact Apple controls OEM Mac Nvidia products), I appreciate his taking the time to reply.
* How does the NVIDIA GeForce 6800 Ultra DDL card for the Mac differ from the PC version (i.e. Does the PC version have dual link DVI?)
The GeForce 6800 Ultra DDL card was designed specifically for the Mac to provide two dual-link outputs to support Apple's displays.
* Does the Apple version of the GeForce 6800 Ultra GPU run at the same core/memory clock as the PC version?
The Apple cards run at 400/550, just like the GeForce 6800 Ultra GPU on the PC.
(Note: Some vendor's 6800 cards are clocked higher than the standard/reference design.)
* The GeForce 6800 Ultra for the PC has two Molex power connectors - does the Mac version source all the power from the G5's AGP pro slot? (or does it have a aux power connector?)
There is an on-board power connector on the graphics card and the motherboard to provide power, so there is no need for an external power connector from the power supply.
(although the only Mac 6800 photos I've seen are tiny, it appears there's a stub connector on the card that (I suspect) uses the ADC (28V or 24V usually) DC power connector on the motherboard that's normally used for ADC display power to provide additional power (regulated down) for the 6800 card. That eliminates the need for Aux. (Molex) P.S. connector(s) like the PC/standard 6800 card versions have.)
* Does the GeForce 6800 Ultra DDL have a low-noise fan?
Yes, the GeForce 6800 Ultra DDL runs very quiet.
* Will there ever be a control panel with 3D/GL/FSAA controls for the NVIDIA cards on the Mac platform? (ATI's retail Radeon cards (and OEM models with the 3rd party patch) have a '3D/GL overrides' feature - which is seen as a big plus by many end users.)
Apple provides all the drivers for NVIDIA-based add-in cards. We supply them with the source code and they provide the final driver.
* Regarding the previous question - if there's no chance of an Apple supplied NVIDIA card control panel (for advanced features/FSAA, etc.) - if a 3rd party wanted to do this, can NVIDIA provide some assistance?
Apple is our customer, so if this is something that they requested, then we would support it.
* There's been talk of previous NVIDIA cards taking a bigger than expected performance hit from using some types of shaders (on the Mac) - is this a concern with the GeForce 6800 Ultra DDL?
GeForce 6 Series GPUs have the most advanced shading engines on the market. Compared to previous generation parts, the vertex and pixel shader engines on GeForce 6 Series GPUs have been completely redesigned from the ground-up. Pixel Shader performance is 4 to 8 times faster. Vertex shader performance is twice as fast. Performance numbers have been outstanding.
* Will there updated/new drivers for the GeForce 6800 Ultra?
Yes. Apple provides all the drivers for NVIDIA-based add-in cards. We supply them with the source code and they provide the final driver. Apple will control the release schedules for drivers that provide even more performance, features and image quality enhancements.
* Do you have any idea how performance compares on the Mac between the GeForce 6800 Ultra and the ATI 9800 Pro/XT card?
GeForce 6800 Ultra represents the largest leap forward in graphics performance in our company's history. As expected, they are much faster than previous generation products from ATI. We will let the benchmarks speak for themselves.
(Note: There's no Mac 6800 perf
Does ATI have anything in the pipeline to combat this new card from nVidia?
I'd google it, but it's too late and I'm too lazy to bother..
Friends don't let Friends use Internet Explorer.
Not that it's in any livable price-range; but two 30" displays connected to a card like that running MacOS-X, can you image that? ;-)
The beauty, the beauty...
GeForce 6 Series GPUs have the most advanced shading engines on the market. Compared to previous generation parts, the vertex and pixel shader engines on GeForce 6 Series GPUs have been completely redesigned from the ground-up. Pixel Shader performance is 4 to 8 times faster. Vertex shader performance is twice as fast. Performance numbers have been outstanding.
Absolut (tm) Garbage!! Here's another, this time with the question:
* Do you have any idea how performance compares on the Mac between the GeForce 6800 Ultra and the ATI 9800 Pro/XT card?
GeForce 6800 Ultra represents the largest leap forward in graphics performance in our company's history. As expected, they are much faster than previous generation products from ATI. We will let the benchmarks speak for themselves.
Talk about trash!! A simple NO would have sufficed. Looks like he's made the most of his Business-for-dummies Manual. Man, why am I so angry over this?
For n=1 to 12 Q: Blah[n] A: 42! Next n
I still have a Cirrus Logic 1mb you insensitive clods!
The 6800 DDL is just a 6800 that supports the new ADC. Apple releases the drivers, don't bitch at us if you don't like the drivers. No, we're not going to tell you about our contract with Apple. The X800 sucks.
Much faster to read, no PR speak to deal with.
-Erwos
Plausible conjecture should not be misrepresented as proof positive.
I'm a heavy mac user, and I read this site pretty much on a daily basis, as the guy responsible for the site puts up a LOT of decent Mac hardware and software info on there. But this has got to be one of the most UNinformative, useless things he's posted. I know there's a desire for info about this card - but shouldn't we wait till some more detailed specs are released, or till someone has some actual silicon so benchmarks can be run ?
... As many other people have said, "Nothing to see here. Move along !!"
Yet another example of "no news" being news
We always give significant performance increases after we have leveled out the stability of the new architecture. GeForce 6 should continue that trend.
They made the same promises regarding the NV30/NV35 series and the shader performance NEVER approached the shader performance of the R300 series. Even Carmack was talking potential scheduling efficiencies during the NV30 launch that never materialized.
ATI may have similar problems as R500+ are going to the pool of ALUs approach where software scheduling becomes paramount to delivering on the performance of the hardware.
I was really interested in this article till about the 2nd question. The responses are extremely limited and seem right out of standardized corporate response. But good job for trying to get some more facts!
Does anyone have any links for Dual-Link DVI cards for the PC?
I believe there are a couple of them out there, but I wanna run one of these 30" Cinema displays on a PC you see!
There was actually a really great, informative article about the 6800 on Tom's Hardware a few weeks ago.
"NVIDIA has seemingly pulled out all stops in an attempt to deliver cutting edge graphics with its GeForce 6800 Ultra. After gamers for too long have had to be content with mere incremental improvements to graphics performance, NVIDIA new card delivers a performance jump not seen for a long time. The device is also solidly engineered as well as insanely fast."
My brain kept thinking that they were talking about the old Motorola 6800 chipsets that Apple used nine years ago... not a GPU marketed as "6800"... I got so confused...
Wait - I sold those things nine years ago!?!? Damn I'm old.
Can someone explain to me why a Mac would need such a powerful gaming card?!
If someone says he and his monkey have nothing to hide, they almost certainly do.
What? Big ugly icons?
why can't we buy and use "PC" Video cards? What is it that makes vendors have to build EPROMs differently (Different?) for the Mac vs. Windows machines for the exact same card otherwise?
It reduces our choices and makes $100 cost $400.
guns kill people like spoons make Rosie O'Donnell fat.
68000, not 6800.
I had those chips powering my amiga's, a 7.14mhz 68000 in my a500, a 14mhz 68020 in my 1200 and a 50mhz 68030/68882 in the blizzard board for my 1200.
damn, I feel old too now
dave
the already-hot temperatures emitted by my Duron @2.3 GHz.
You mean you pay out the ass for the latest video card and heatsinks, but you buy the cheapest CPU out there and push it to the very limits? That just sounds odd.
I answer questions with no add-ins of emotion. There is no technical reason why I would answer otherwise.
Sincerely,
Ujesh Desai
They should totally realease that card for the PC market. If anything it will let apple sell some really nice and pricey displays, hell the damned thing costs as much if not more then most of their computers they sell.
The Apple didn't use a Motorola 6800. They used a MOS 6502, which was sort of like a Motorola 6800, in the Apple II (Or various incarnations of the 6502, but never a 6800) They then used a Motorola 68000 in the Lisa and Macintosh.
Great monitors but I just noticed that the 30inch isn't actualy 30 inces! They've regressed to crt marketing!
Come on apple, everybody else is sizing their LCD's by their viewable size let's not go back to the assinine advertised vs. viewable screen size. http://www.apple.com/displays/specs.html
--
..."the new ACD", as in "the new 30" Apple Cinema Display", ok.
But if you actually meant ADC, or "Apple Display Connector", that is no longer used. With the new line of displays, Apple has (thankfully) gone back to standard DVI for the displays and for their future OEM video cards.
And of course stepping further back the Apple 2 series running the 6800 knockoff the 6502.
Food not Bombs is a nice platitude but it breaks down when you notice that the Bombees are usually well fed
Boo hoo. Why don't you use one of the 100's of graphics cards that work in your PC but not in my Mac.
Apple teeters on the precipice of doom, one step away from plummeting to its ultimate nadir of bankruptcy, chaos, and implosion.
I thought the release date for the OSX version of Doom III was still up in the air...
When you die, on your deathbed, you will receive total consciousness. So I got that goin' for me, which is nice.
He might need lots of screen real estate but not so much CPU power. Many design jobs and other tasks are like that, you know...
;-)
And those Durons aren't half bad, mind you. Or maybe he just ran out of money halfway through his upgrade
... you mean oppressor.
LAST YEAR(2nd year University) we learend to code in assembly using a Motorola 6800 board--no lie! We had to pay $150 for the damn book that looked photocopied... /bitter
Boxing Equipment Reviews
Bad Panda! No Bamboo for you! In matters of importance ACs will not be responded to. Want to say something critical,OK
For the Mac, dunno.
;-)
But Radeon X800 XT certainly matches (wins some, loses some) the GeForce 6800 Ultra in PC land. Reviews confirming this are in abundance.
But like said, dunno about Macs and driving 30" screens thru two dual-link DVI ports... Maybe not. I follow the developments in 3D hardware, and there haven't been any rumours or info about such a Radeon card (by ATI, Apple, or somebody else).
It would need four TDMS transmitters on board. Then again, the Evans & Sutherland four-way R300 card has eight
Actually there is a justificative for little-endian, just like there is one for the British driving on the left. Casting values from 16 bits to 8 bits and vice-versa in little-endian machines is automatic. In the old days of limited memory this was an advantage. (As for driving on the left side of the road, it came from horse riding: one mounts a horse from the left side)
That is, after all, the reason a PC would need such a powerful gaming card as well.
Maybe this will get my PC up to spec for Doom 3.
That's right, I read at +2 and post at +1. Not even I care what I have to say.
The 30" monitors from Apple have a resolution that cannot be fed by a single-link DVI connection. So they use dual-link DVI. Both single-link and dual-link are part of the DVI 1.0 standard, nothing Apple specific about them.
The difference between single-link and dual-link is how many of the pins in the connector is used for transmitting data, in a nut shell 12 pins for the former and 24 pins for the later.
Apple is using DVI-D (digital only) DVI connectors with a dual-link pin out for the 30" display. So one dual-link DVI-D connection is capable of driving one 30" display. The 6800 adapter used for these displays provides two dual-link DVI-D outputs, so one adapter can drive two 30" displays.
As a reference...
DVI connector type summary
DVI 1.0 specification (PDF)
nope -- the monitor is two TFT "panels" that are side-by-side. these panels normally come ot of the "panel machine" 4-, 6-, or 8-up in a sheet and are then sliced apart into individual displays.
what they've done here is left two stuck together.
check out the resolution -- 2560x1600. if you take two 1600x1280 screens, orient them vertically, and stick them together side-by-side, you get 2560x1600.
and now size -- a 21" 4:3 ratio TFT is roughly 16.8" wide x 12.6" tall. turning two of these panels on their narrow edge and joining them at a long edge yields a panel with roughly a 30" diagonal measurement (30.2 to be exact, but my original numbers weren't precise).
the card with two DVI outs is necessary to drive this thing because there are essentially two TFT panels to be driven.
the price difference between a duron and the athlon xp of the same speed if generally 5-10 dollars.
in this case, its 3 dollars.
its amazing how cheap CPU's are to basically anything else in a computer.
I think you mean the 68000 series, as in 68020 / 68030 / 68040. No biggy, just an extra zero. Man, remember when you had to look for a computer with a floating point coprocessor listed as a feature? I used to have a Performa 630 without a FP. You would not believe how slowly things render when the FP is emulated. I eventually "upgraded" to a PPC 601, but that actually seem to slow the OS down because it had to emulate a lot of the old 68000 code present in Mac OS 7.5 at the time. Now I feel old and I'm only 22.
A: I guess I'll have to wait until my dual 2.5 G5 w/6800 & 30" display gets delivered in late August to find out.
Why is this modded flamebait?
It looks like this post was just explaining information about the new card - am I missing something? Seems like a pretty BS mod to me.
Since you seem to know what you're talking about ... does this mean I can drive any DVI monitor with this card, not just the 30"?
I'm curious because I have 23" Cinema HD Display and would like to drive it alongside the 30" when I buy it. Don't want to waste the old technology, don't you know.
Can I do this, assuming that I get a ADC to DVI adapter for the Cinema Display?
Thanks!
D
To a Mac near you!
;-)
Though, UT2004 runs quite well on a Mac. As do Call of Duty and BF 1942. Halo is a bit slow.
This at 1920x1200 resolution (23" Cinema Display)... played at WWDC on a 2x2.0 G5 with a Radeon 9800. Frame rates at that res were pretty consistent 70 FPS, never dropping below 40. So it's not ALL bad.
Though BUYING a Mac specifically to be a gaming machine, I might not advise that
I'm not sure about this, because I have two 1600x1200 displays, and I have a single DVI connector from the back of my FX5200(POS) that connects to a splitter cable that gives me two DVI connectors to connect both displays. What the above poster is talking about is the type of connector that I have, a 24-pin DVI that can drive two displays with a splitter, or theoretically, one dual display without. I once saw a page with all of the DVI connectors, and there must have been 8-10 different type of connectors. Some supported analog and digital, other just digital. Anyway, that's my thoughts. It's a still a very confusing technology.
Humm not fully sure... dual-link works by sending even and odd pixels for a given color channel down two different links. Single link transmits even and odd pixels over a single link.
Basically DVI defines 6 signal pairs for pixel data, in single-link 3 of the 6 are used, one for each color channel (RGB). In dual-link even pixels go down one bank of 3 while odds go down the other bank of 3.
From what I can see the channel definition for connections is the same for single-link and dual-link. So in theory it could work if the adapter could toggle between sending just even pixels to sending even and odd pixels on the first set of links.
A single dual-link DVI-I port can drive any DVI-I monitor, so the answer to the grandparent is Yes, as long as you get the ADC -> DVI adapter.
I bet if you talked congress into giving the palestinians 3 billion dollars in cash and weapons every year, they would be happy to fight isreal with f-16's, ah-64's, tomahawk cruise missles, mavericks etc. Terrorism is a desperate act, by desperate people. Put yourself in their shoes. You have no money, and are fighting against the occupation of your land. The occupiers have an endless supply of money and weapons, supplied by a third nation (so they can fight forever, with no financial impact on their own country). What do you do? You fight however you can, wherever you can.
Besides, Israeli leaders advocate terrorism. They always have (read about the King David Hotel bombing, it was one of the first modern terrorist attacks). They advocate assasinations in other soveriegn nations, and have for decades. Read that again. It is POLICY to assasinate those they don't like, outside of their country. Including the wrong targets, more than once.
Support who you want, I think they are both wrong, but don't blind yourself to the truth. The Israelis are a bunch of scumbags, of the highest order (not Jews, Israelis). They use terror, they ignore UN resolutions, they torture, they murder, their leadership is filled with war criminals, and they whine like a bunch of spoiled schoolgirls. They brand anyone who disagrees with them as anti-semetic, and are as dangerous as allies as they are as enemies.
Everyone has a right to exist, be they Jew or Arab.
Oh, come on. It's several times more powerful than some of the computers people use, so why not put it to use? Linux in a ramdisk, set up at boot, while the system uses another (cheapo) PCI card. Kind-of sort-of possibly not entirely useless. If someone could hack up a DVI-to-PCI adapter and some ugly code to drive it, well, even better.
(Just don't ask me to make it work)
As other posters pointed out, you are thinking about the 68K family. Motorola produced a 6800 processor, though. It had an 8 bit data bus and a 16 bit addr bus. It was sort of an advanced 6502 (used in Apple II's). I'm not aware of any computer based on the 6800. Radio Shack sold the famous Color Computer based on the 6809 and the Micro Color Computer based on the 6803, IIRC. The 6800 was sold mostly in kits used by hobbists and in universities, to build small projects.
Donate free food here
xlr8yourmac is one of the best Mac sites out there, period, and has been for a decade or so. (Before I started using /., xlr8yourmac was my homepage for years.) It's truly a one-man operation, totally non-commerical, getting by on limited advertising revenue from Mac-only companies. Why are you trying to steal Mike's traffic on this?
Honestly, if I were there, I would try to forget the whole mess an do something productive in my life that had nothing to do with fighting.
That's what everyone else should be doing, too.
This is a decade-long war! Live with things as they are, people. It's not worth trying to change things.
D
We need that GPU power to drive the year's greatest advancement in Mac games... the new version of Chess.app in Mac OS X 10.3 Panther!!
Yessir, the 10.3 version of Chess now has a true OpenGL-baed 3D board. You can view from any angle and can even adjust the textures! Hooray!
For those not familar with Chess.app, it is the (opensource) bundled game for Mac OS X. Until the most recent version, it had been largely unchanged from its original form in the NeXTSTEP OS.
(BTW, the Apple Puzzle game, which has been around since System 1.0, isn't yet available native for OS X, but it might reappear as one of the Javascript+CSS3 applets in the Dashboard of 10.4 Tiger next spring)
Nope I was trying to answer if the dual-link DVI-D connection on the adapter can be used to drive a single-link DVI-D expecting display. I believe he is asking if he can use the 6800 dual-link adapter to drive displays other then a 30" display.
It would require that the adapter understand that the connected display is single-link and hence not do the even/odd splitting. I don't know if the adapter supports that or not. Pin out wise it should work if the adapter does the right thing.
A single dual-link DVI-I port can drive any DVI-I monitor, so the answer to the grandparent is Yes, as long as you get the ADC -> DVI adapter.
Actually this isn't true or we wouldn't have dual-link for example. It depends on the resolution and refresh rate, basically the bandwidth needs of the display.
Also...
DVI-I = connector carrying both a digital and analog signal
DVI-D = connector carrying just a digital signal
DVI-A = connector carrying just analog (extra to DVI specification)
For the digital aspect of DVI connections you can have either single-link or dual-link (supported by either DVI-I or DVI-D connectors, at least fully connected ones). So don't confuse DVI-D as implying dual-link, it just implies a digital only connector.
Apple's new displays use DVI-D connectors (at least that is what I recall seeing) with the 20" and 23" screens using single-link and the 30" using dual-link. The older displays used ADC connectors (basically single-link DVI with pin out for usb and display power). Apple's DVI to ADC converter has a DVI-D connector on it (looked at the one under my desk). Apple doesn't provide a ADC to DVI converter but third parties do (also ones for ADC->VGA).
DVI -> ADC converter converts a DVI output to an ADC output (what you need to drive an ADC only monitor if you adapter doesn't sport ADC)
ADC -> DVI converter converts a ADC output to a DVI output
I am not sure if the adapter in question sports DVI-I or DVI-D outputs (traditionally I believe adapters have DVI-I, at least high end ones). You can plug a DVI-D cable into either a DVI-D or DVI-I output. Also having DVI-I outputs allows the easy split out of VGA if needed.
oops... I read your "single dual-link" as "single-link" in your statement "A single dual-link DVI-I port can drive any DVI-I monitor, so the answer to the grandparent is Yes, as long as you get the ADC -> DVI adapter.".
The same card is available (albeit in limited quantites right now for developers) for Windows machines!
Best Buy can have you arrested
"The Wildcat Realizm 200 boasts a VPU and 512 MB of onboard memory, the largest graphics memory available on an AGP 8x-based graphics accelerator to effortlessly handle large models and textures. Wildcat Realizm 200 is equipped with two, dual-link DVI-I connectors, which are ideal for driving multiple high-resolution professional displays from a single graphics accelerator, including the dual high-end 9.2 Megapixel displays."
why do i get the impression that the above interview was with one of those stupid chat bot's that give generic answers based on key words in the question?
Don't call me back. Give me a call back. Bye. So yeah. But bye our, well, but alright we are on a shirt this chill.
This is Apple we're talking about. It just works.
I think you are slightly misinformed with regard to graphics resolution capabilities of cards available on the general market. For some time 3Dlabs, and Matrox have had the ability to drive the IBM T221 displays which have a native resolution of 3840x2400 still higher than the new 30" cinema display offering from Apple. The connection interface wasn't designed by Apple to support the 30" display. Also if note Apple's offerings have yet to hit the market while the T221's have been available for over a year.
OF uses code stored in the card for hardware initialization. Since OF requires the firmware to be in a bytecode based on the forth programming language (F-code), and provides an interpreter for such language, OF devices are portable between different architectures. So, yes, the same card would work on Sun. It would be initialized and you would get a framebuffer, at least. For more advanced features you would still require high-level video drivers in native code.
PC hardware is locked to ACPI and other bunch of "standards" created by Intel. While there are some stuff similar to F-Code (AML) it is not used by anyone who is not x86 compatible. And I doubt that Intel would ever adopt OF, making hardware really CPU independent.
Of course, you usually can burn at your own risk a pirate firmware in your PC card. But the price difference is to justify the development and support costs of the "not mainstream" plaftorm.
2560 x 1600 pixels?!? Damn, if I has one of these, I'd have to invest it better porn!
Linux drivers would be nice also.
Saying "I'll probably get modded down for this" in a post is the best way to get it modded up.
he's doing this "mike" a favor, doof.
I got to put my fingerprints on the smaller two Apple Cinema Displays yesterday, and I've got to say: The thought of two 30" Cinema Displays gives me a stiffy. They are super badass looking screens.
Sorry. Just thought I'd share.
Why yes, I AM a rocket scientist!
You'd use one of the two dual-link DVI ports on the 6800 to run the Uber-Monitor, and the other one with a DVI->ADC adaptor dongle to run the 23" display.
Or, (and this is what I suggest) he should just get two new Cinema Displays and send me that crusty old 23" to me as a thank-you gift for explaining how this works.
*toothy grin*
Why yes, I AM a rocket scientist!
Yes but do you know for the fact that a given dual-link output on the 6800 will correctly fall back to being single-link when a single-link only device is connected?
I cannot find conformation of that in any docs, ideally it should but...
Good question. You'd think, right?
Why yes, I AM a rocket scientist!
If it says it conforms to the DVI standard, then yes, it must support single-link devices properly. It doesn't necessarily have to support any particular resolutions, but it seems unlikely they'd deliberately cripple it.
The DVI spec says that if a particular resolution CAN be done on a single-link, the adapter MUST use single-link. It can only shift up to dual-link if the bandwidth is too high at the chosen resolution, refresh rate and pixel color depth.