ohmygod2 wrote to us with a story from
SF Gate that Apple, unsurprisingly, is going to be one of the purchasers of IBM's PowerPC 970. At this time, though, it's unclear where Apple is going to actually *use* said chip.
Update: 10/14 15:53 GMT by
H : Follow-up to Tim's
story.
Slashdot Mirror
Google News of course has pretty much all the acticles. They are all based upon the same IBM press release, but many make slightly different predictions.
Both the Power4 and Itanium are tremendously powerful processors. See this page, ironically intending to promote the Itanium2 (which is a tremendously powerful chip), to see how a 1.3Ghz Power4 compares with a P4.
http://www.wired.com/news/mac/0,2125,55722,00.html
This is being discussed all over (here, Ars, Macworld) but the Wired article takes a much more "done-deal" tone than any of the other commentary I have seen yet. It suggests the possibility of Macs with 4TB of ram too :-)
--is not to be confused with user #672982 - Bame Flait
Slashdot: SF Gate: Wake me when one of the companies comments please. They will, but be patient before yelling CONFIRMED!
Thanks
So close and yet so far from the world's perfect ID number
The 'G5' will be whatever chip Apple slaps on their next 'big' processor upgrade. The G3, G4, G5 designations have nothing to do with the chips themselves or their model numbers. They're just spin that Apple uses to compete with the Pentium 3, Pentium 4, etc lineup. Apple could decide to throw AMD Hammers in their next generation systems and would still call the chip the 'G5'.
Ignorant consumers are unlikely to percieve any performace improvements in models unless there is some underlying technology that gets a new name or a new version number. It's like model years in cars, the 2002 has a higher number than the 2001 model, so it MUST be better, and people drool over it.
Article X: The powers not delegated... by the Constitution...are reserved...to the people
Disclaimer: I used to work for Intel's server motherboard division. I don't think I'm biased, but wanted to get that out of the way.
Another non-functioning site was "uncertainty.microsoft.com."
The purpose of that site was not known.
MHz and GHz are fine, but that's just RPMs. As anyone who has driven a bored out V8 or massive V10 will tell you, there is no replacement for displacement. You can rev a crappy 2L engine to 7,000rpm and make your itty bitty wheels spin and make a nice smell. But if you want to throw asphalt into the air and stike terror into living things you put the pedal to 8 or 10L of fire-breathing cast iron.
The Power line from IBM has that kind of displacement. You don't need GHz, or at least not as many, to get a lot of torque out the back end. And of course once you get torque, you can work on the revs. As we've all seen, higher revs happen with improvements to production technique, and are a given. But more torque (ie, more and better logic on the die) takes a strategic investment, and some amount of risk. But I'll take a bigbore Dodge Viper over this years higher-revving econo Tondabishi any day.
=^..^= all your rodent are belong to us
Despite the fact that the PPC 970 will be introduced at 1.8 GHz while the P4 is expected to be around 3GHz, the 970 will execute 8 instructions per cycle. I can't recall how many instructions per cycle the P4 executes but I believe it is far fewer than 8. Of the handful of articles I read about it, somebody said that the 970 would effectivly compete with a 4-6 GHz P4 as a result of the instructions per cycle efficiency of the chip.
Plus, it's gotta run cooler than a 6GHz P4 would. As a laptop owner, ignoring the superior performance potential of this chip, the cooling and power requirements alone would make me choose a 970 architecture over a Pentium.
The fabled G5 is the next generation chip from Motorola, Apple's current supplier of G3 and G4 chips.
Sorry, but you're wrong. IBM currently supplies Apple with the G3s (for the iBook). Motorola only supplies Apple with the G4s.
The Gn style of naming is Apple's doing. Motorola and IBM use names like PPC 750 or PPC 7440.
If Apple uses this chip in their future you can bet it will be called G5s (if they decide to keep with that naming convention).
sin(6cos(r)+5A)
Uhm, what are you talking about? This IS a PowerPC chip. It uses the PPC instruction set and is backward compatible with the 32 bit G3 and G4.
.technomancer
No need. The PowerPC 32bit ISA is a subset of the 64bit version. 32bit apps run in 32bit address space perfectly happily.
You only need to recompile if you need to see the full 64bit address space.
Oh, and don't worry about AltiVec. The AIM alliance jointly developed the Vector SIMD extensions. Apple calls the unit Velocity Engine, Moto uses AltiVec and IBM calls it VMX.
http://www-3.ibm.com/chips/news/2002/1014_powerpc. html
moox. for a new generation.
FYI, the G4s have 7 stage pipelines It's in the side bar about halfway down the page.
T Money
World Domination with a plastic spoon since 1984
Now here's a case of when life hands you lemons you make lemonade. The parent was talking about simultaneous execution, i.e. how many instructions per cycle can come out of the end of the pipeline. You're twisting it around to take that number and multiply it by the horribly long pipeline.
Let's go back to basics, every time the processor makes a mistake in guessing what's going to happen next, the pipeline has to be cleared. Every modern CPU faces this problem so you want short pipelines so your penalty is low. Intel has vastly longer pipelines and thus they pay a higher price every time predictive branching screws up.
So having a large number of instructions being simultaneously worked on is a *bad* thing unless they are also being pumped out and executed in large numbers as well. AFAIK, in the P4 they aren't.
According to Ars Technica the P4 in the real world gets 2.5 instructions per cycle done. With the new G5 getting 8 done per cycle with half the pipeline depth, performance should once again favor the Mac side of the PC wars.