[G4] Liquid Cooled new g5 2.5 ghz

[sr ferenczy]

actually, apples website says that the 2.5 ghz is the 90 nm process.

http://www.apple.com/g5processor/ibmprocess.html

as far as the cooling setup, it seems like apple could easily have one 
fan and one radiator as shown on their website, as the internal pics 
seem to simply show a metal cover on the processors, rather than 2 
honking large heat sinks as are on the rev 1 G5s.

http://www.apple.com/powermac/design.html

this would make sense, as if they are relying only on liquid cooling, 
there is no need for a large heat sink, simply a plate resting on top 
of the processor to pass the liquid through. both plates then pass on 
to the single fan and radiator (didnt some rumor site also mention the 
lack of dual processor fans on the new dual processor models??)

as far as cars, well, my car is rear engined, oil cooled, and has no 
grill through which air is forced, and it stays cool.


i am thinking that apple may just be product testing this liquid 
cooling system, getting ready for a short time in the future when they 
will absolutely need liquid cooling. especially since the specs on the 
90 nm processors are stating that the chips are dissipating 1/2 the 
wattage, the 2.5 ghz has to be running cooler than the old 2.0...


sandor


On Jun 9, 2004, at 4:41 PM, Joseph B. Gurman wrote:

>     Steven wrote:
>
>> It seems to me that if I read the diagram correctly one of the
>> processors will be much hotter than the other...
>
>     The diagram is a little misleading, as it shows only one fan and 
> only one liquid-coolant radiator. If the pictures of the G5 innards 
> are still correct (and have not been changed to those shown on the 
> AppleInsider Website last week), then the 2 x 2.5 will still have 
> upper and lower fans corresponding to upper and lower CPU's, and the 
> marginal difference in temperature caused by convection of heat from 
> the lower processor should be handleable by the upper 
> fan-plus-radiator combo.
>
>     Of course, this isn't quite like a car or (even more so) a 
> motorcycle, which can use the speed of the radiator through the air to 
> carry heat away a lot faster than the fans can.... unless you plan to 
> strap your G5 to the hood of your 'Vette.
>
>     Seriously, this design, cool (no pun intended) as it is, 
> represents a setback: it means IBM isn't producing enough 970FX chips, 
> which produce much less heat than the 970's thanks to smaller die 
> size, to roll them out in desktop machines. To deal with the > 50% 
> additional thermal output of a 2.5 GHz processor relative to a 2.0 GHz 
> one's, Apple's had to add liquid cooling. For that matter, has anyone 
> heard of anybody who's received a dual G5 Xserve (970FX-powered) yet? 
> We're still waiting for ours....
>
> 						Joe Gurman
> -- 
> "I love deadlines. I like the whooshing sound they make as they go by."
>                                                          - Douglas 
> Adams, 1952 - 2001
>
> Joseph B. Gurman, NASA Goddard Space Flight Center, Solar Physics
> Branch, Greenbelt MD 20771 USA
>
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