SillyDog701

[Antony]

Another picture about the inside liquid cooling unit of the upcoming dual 2.5GHz G5.


(Again, thanks to AppleTalkAU)

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[Edward]

It looks like the motherboard is attached to an automobile air conditioning system.

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[Antony]

Jobs promised 3GHz before the end of the year, and I don't know if we'll see it, but IBM is richer than anyone really knows and has superior marketing techniques (ie, they milk any new competing processors by sticking them in IBM servers and selling them) not to mention the fact that they throw ridiculous amounts into research when they actually feel like beating their competetors.

Well, according to this InfoWorld news OR MacCentral article (New G5s announced; no 3GHz, G5 laptops planned, 9 June 2004)

"It's actually quite simple," said Boger. "When we made that prediction, we just didn't realize the challenges moving to 90 nanometer would present. It turned out to be a much bigger challenge than anyone expected."
"All-in-all, no we are not getting to 3GHz anytime soon, but what we are announcing today is a very significant upgrade in performance and its something that are customers will be very happy with."

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[Don_HH2K]

Judging by that picture the new G5 is going to be bigger than some of the circa-1994 PCs in my basement.

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[Antony]

The new 2.5GHz speed might be some disappointing to some Mac users as Steve Jobs promised 3GHz. According to many resources, the 2.5GHz 90-nanometer processor is a huge challenge. Apple's solution is using liquid cooling technique, which is not new.

internetnews.com has a report:

"It's a completely maintenance free system," Tom Boger, Apple senior director of desktop product marketing, told internetnews.com. "The processor was built using the 90-nanometer process. When you do that, you challenge the power density. You could see the same problem happening with Intel's 90-nanometer chips."

The cooling technique is nothing new. For years, computer enthusiasts and gamers have used various refrigeration techniques, including the use of ethylene glycol or propylene glycol to reduce surface temperature on hot-running chips. Running at top speed, some Mac users report their G5 machines run at temps of 85 Celsius or 185 Fahrenheit. Apple said it designed its G5 systems so that the fluid encircles the two G5 processors and transfers heat from the chips as they work harder. The computers are outfitted with 21 different temperature sensor points to help monitor the system.

Apple said speed is not the only factor in the design of its systems, but boasted that its 2.5GHz ran significantly faster than Intel's 3.4 GHz Pentium 4 systems in benchmark tests of Adobe Photoshop, Logic Pro 6, and Final Cut Pro.

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[Antony]

Photo of inside of the new dual 2.5GHz G5


and the radiator,


(photos stolen from Mac Rumors)

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[Antony]

inside the new PowerMac G5 dual 2.5GHz.

Overclockes Australia has posted pictures of the liquid cooling unit from a PowerMac G5 dual 2.5GHz in their website,

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