Slashdot Mirror
DIY Mac mini Overclocking
mirko writes "So, you wanted a 1,42GHz Mac mini but either because of some distribution woes or because of your tight budget you could just get a 1,25GHz ?
Don't worry : Leo Bodnar just found out how to overclock your machine. Of course, you'll have to open it prior to anything else but you already know how to do this."
So, you wanted a 1,42GHz Mac mini but either because of some distribution woes or because of your tight budget you could just get a 1,25GHz ?
No, not really. 1.42 GHz isn't really so much faster than 1.25 to justify voiding the warranty.
Well, if you're just moving up the speed from 1.25 to 1.42, cooling shouldn't be an issue since they are shipping minis at the higher speed in the upgraded one.
I would bet the chips are the same core in both, but the default 1.42 chips are certified qualitywise to run at that speed. Overclocking the 1.25 chip to 1.42 should really be no big deal.
When it comes to the Mac mini, you might want to consider this:
The default warranty (if you don't buy the extended AppleCare) is one year.
This is a $499 electronic device.
A 1-year hardware warranty on a gadget this cheap is worth, what? Maybe $50?
So whenever you are considering doing something like this (and yes, overclocking pretty much alwasys voids warranties, even if all the early FUD about opening the mini case turned out to be false), the judgement call you need to make is: Will this mod be worth more than about $50 to me?
In the case of this mod, it's a way to turn a 1.25 GHz mini into a 1.42 GHz mini.
But for $20 more than the price of upgrading the HD from 40GB to 80GB, you can get an actual 1.42 GHz mini with an 80GB drive already installed, and keep the warranty intact.
So in this case, no. Probably not really worth it.
However, on a system this inexpensive, it's really just a matter of time before some people start coming up with interesting hacks which are more than worth it.
I doubt the mini will replace the X-Box as the hardware hacker's favorite toy anytime soon, but it will be interesting to see what happens over the next year or so.
Information wants to be anthropomorphized.
I want one. badly. But the Mac mini is a perfect example.. I can't justify paying 500 dollars just for an operating system.
Actually, it's not just an OS. There's word processing, presentation, photo, video editing, and music creation applications provided as well. And I hear that they even throw in a cute little computer as a bonus.
If you check your preferences you will notice that you can block stories from the homepage on various topics, including Apple stories. Any "hardcore computer nerd" worth his salt would have noticed this immediately.
Smeghead every day of the week.
People complaining that the hack is really not worth voiding the warranty are missing the whole point. It is just the coolness factor out here. Somebody, somewhere figured out that by setting those specific tiny little jumpers (I still can't believe how tiny they are), the Mac Mini could be overclocked and shared this info with the whole wide world. Appreciate that and just think about what *you* have figured out lately. Losers.
Funnily enough, the BMW Mini One can be 'overclocked' too. Like the CPU in the two Mac Mini models, both the One and the Cooper have the same 1.6 litre engine, the only difference being the engine management software. Must be something in the name 'Mini'...
You must think in Russian.
Really the WHOLE point of having a real OS is that the interactive stuff is interactive and the batch stuff happens when you're not lookin'...
The MacMini will NOT make a good Doom3 machine. For interactive stuff (even, gasp, light video editing!) it's fine the way it is. For long term stuff (DVD encoding), background the app and do something else (even at the same time!) Who cares if it takes 25 minutes instead of 20 minutes?
Generally, 'make DVD' is the last thing I do befor e I go to bed...it's always done by morning.
If you wanted the last oomph of power, you shouldn't have bought apple's cheapest box!
"Draco dormiens nunquam titillandus."
Actually, this might be interesting to use for underclocking. Take your Mac Mini 1.42, underclock it a bit to 1.25, and it's even less likely that the included fan will turn on. Makes it all the more of a silent computing solution.
They do this type of thing all the time at silentpcreview, although they gain a bit more (by way of silence) because they can also adjust the CPU voltage down once the clockspeed is reduced. Just a thought. -- Paul
OpenSource.MathCancer.org: open source comp bio
I also found that this picture makes a great desktop wallpaper...
Kudos to the guy photographing this stuff.. He took some pretty good shots!
Just when you make it idiotproof, some idiot builds a better idiot.
Just because they make a 1.42ghz model does not mean that a 1.25 can be overclocked to 1.42 safely from a heat perspective. One of the reasons a particular part is sold at a particular speed is power consumption. A 1.25Ghz processor is a "lower-bin" part and is sold for a cheaper price. IE the transistors in the part do not function as efficently or quickly as the higher-bin 1.42ghz model. There is a lot of different things that can make that be so, but suffice it to say that Apple is probably buying parts based on a Power Consumption spec. ie... The cheap Mac Mini's are probably being built with parts that run at 1.25Ghz @ say for arguments sake 7 watts of power consuption. They are also buying parts that run at 1.42ghz @ 7 watts of power consumption. That way their heat profile is about the same regardless of which part they use. This isn't to say that either part won't run faster, but that they will generate more heat to do so. [Higher leakage currents etc]. Therefore it is patently false that you can safely overclock a slower part just because they have a faster model. The parts used in the faster model don't run hotter, they run more efficently typically. You're results will vary because IBM/Motorolla may have labelled a part that was technically good enough to be 1.42Ghz as 1.25 just to make quota... It depends on their yeilds. Physically the chips are made the same, higher speed chips just come from the center of the wafer while slower typically come from the edges, but in practice it's probabilistic thing and you may get a faster chip just because they didn't fully test the chip for fastest speed or that they needed more 1.25ghz chips then 1.42ghz chips.. Anyway's there is no guarantee, you're just as likely to have the part melt at 1.42ghz then work beautifully... Can also depend on your usage pattern low cpu usage in a cool environment will make things work much better then a 95 degree house with heavy usage...
-- Matthew Schiller
Electrical Engineer
Previous Apple Intern [Flat Panel iMac]
The only benefit I can see as far as using it as a media player or similar is that you don't need an Xbox to USB cable.
I see a few others.
1. The mini is very quiet, the X-Box is notoriously noisy.
2. The mini video card is modest by modern PC standards, but vastly superior to the one in the X-Box.
3. The mini is ready for use as a media server with no hacking required. iTunes is a fantastic app for storing your music library. Plug an EyeTV 500 into the firewire port, and you've got a digital broadcast Tivo-alike. Install VLC (which is a free download), and you're playing full-screen videos of whatever gray-market stuff you find on the Internet. The DVI out plugs right into most modern HD televisons and projectors without the need for an adapter. Plus, all of this can be controlled with an IR remote from Keyspan, which I've seen on the web for as little as $22. The built-in bluetooth and 802.11g options are nice to have, as well.
That said, it's not perfect.
1. The CPU isn't really fast enough to give you full-frame 1080i HDTV via the EyeTV. Not the end of the world if you are using an XGA or WXGA projector, but still...
2. You need a USB break-out box to get surround sound... but at least the OS supports both Dolby 5.1 and DTS.
3. Hmmm... actually, that's the whole list.
Information wants to be anthropomorphized.
Solder mask is basically a paint that isolates the various 'pads', or landing areas for component pins, physically in space, so that the solder has much less tendency to bridge gaps and cause shorts. Usually, it is green, but it can be made in any color. Myself, I've made boards with black, red or transparent solder mask. Green is the traditional color, and afaik, there is no performance difference electrically or physically between the colors.
Just for completeness' sake, the lettering you sometimes see on a PCB is called silkscreen, and is usually white, but again can come in a variety of colors like yellow or black. Again, tradition says it should be white.
PS: I'm not an electrical engineer, and I never will be.
Mostly random stuff.
Sorry, but if someone is going to tell me how to open my brand new computer and mess around with its internal workings, I don't want to read things like this:
Here is the bottom of the board. Or whatever you call it.
The next comment I write will be ready soon, but subscribers can beat the rush and see it early!
with everything you need
Assuming you can live with integrated video, no DVD, 128M RAM, Lindows OS, no FireWire, no DVI, no iLife, ugly box, etc.
Come on, you're not really suggesting that that computer would be a good purchase are you?
The video card in the mac mini is vastly inferior to the x-box card, since the x-box card is derived from a full power geforce 3.
The mini-card is a ATI Radeon 9200, which isn't better than a geforce 3.
You really have no clue, do you?
The X-Box is a 733 MHz Pentium system with 64 MB of system RAM, and the video "card" which you say is "derived from a full power geforce 3" is a 300 MHz GPU designed specifically for the X-Box by Microsoft and nVidia. It's an integrated chip which shares the system bus. It supports a maximum resolution of 1920x1080. Plenty good enough for hooking up to TV sets, even some HDTV sets, but pathetic by computer card standards.
I'll take the Radeon 9200 with it's own DDR video memory, thanks.
P.S. I've got both an X-Box and a mini, and have witnessed both of them perform. There's no question that the X-Box fails to even come close to the video performance of the mini. Sorry. It just isn't as good, no matter how much you might want it to be.
Information wants to be anthropomorphized.