this seems to just keep the processors within their range. the system also has a liquid cooling system to quench the processors. the difference in noise in my room when i sleep the athlon is ridiculous - the G5 sounds like a slightly loud external hard drive that's spun up. So why so effing hot? i mean, this idles at the max temp my athlon 2500 peaks at! it certainly idles at a hotter temp than it needs to, but i have no problem with that: the system runs the fans dynamically to keep the noise down, so at idle it's not as cool as it could be.
#VLC FOR POWER MAC G5 FULL#
however, it's not the hottest thing, of course: at full load (DVD rip+encode or playing 15 videos at once + MP3 + tasks + flicking around Exposé) both CPUs have hit a max of 83C (181F) (the computer is supposed to automatically sleep around 90C or so). the memory controller is actually one of the hotter things, it idles at 62C (143F). My dual 2.5GHz PowerMac G5 idles at 52C (125F) on CPU A and 50C (122F) on CPU B. Hence, the liquid cooling system in the dual 2.5GHz G5.įor literal heat, this puppy is pretty hot. So you need much more efficient cooling to keep the chip temperature the same. So you have the same amount of power, but you are trying to suck it out of a smaller piece of silicon. If we assume that the 2.5GHz 970FX has that same power consumption, but has a die size of 60mm^2, then the 970FX will produce 700mW/mm^2. The 2GHz 970 had a die size of about 121mm^2 and put out a maximum of 42W. Lets use some numbers, these may not be 100% accurate, but they'll explain the basic concept.
Now, when you go from 130 nm to 90nm, the linear dimension across the chip is ~70% of what is was, and the area of the chip is (70%)^2 or about 50% of the previous chip. Other than the process change, I believe there were very few changes to the chip. So when IBM went from 130nm for the 970 to 90nm for the 970FX, the top clock speed went up from 2GHz to 2.5GHz. When you do a die shrink, you can lower the power required at particular clock rate, or you can run at a higher clock speed with the same power dissipated.
#VLC FOR POWER MAC G5 MOD#
I have mod points, but I figured I'd answer your question instead.
These days Apple is well known for its forays into the cluster computing space - but that's a far cry from the sort of transactional throughput capacity of IBM's high-end servers.The design rule (feature size on chip) is pulled back from the bleeding edge and other layout techniques are employed to make these processors rock solid, to avoid costly downtime from hardware failures in business servers. IBM's POWER-series chips are designed to trade away ultra-high-speed clock rates in favor of low failure rates.
#VLC FOR POWER MAC G5 SERIES#
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