Re: a dozen cpu's on a chip
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 08 May 2008 08:29:07 -0700
On Thu, 08 May 2008 08:26:56 -0700, Jeff Liebermann <jeffl@xxxxxxxxxx>
wrote:
On Wed, 07 May 2008 19:48:31 -0700, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
http://www.eetimes.com/news/latest/showArticle.jhtml;jsessionid=CESEXHWXUFJNKQSNDLSCKHA?articleID=207600531
I bet we'll see 256 one of these days.
John
Maybe. The problem is heat. The current E8500 Intel Wolfdale
Core2Duo chips are about 110 sq mm for 2 cores and burn about 65 watts
of heat running at 3GHz. Let's call it 50 sq mm and 30 watts per CPU.
Extrapolate that to 256 CPU's, and we have 12,800 sq mm and 7.7kw of
heat. If the chip were square, it would be 113mm on a size or roughly
the size of a CDROM disk. 7.7kw of heat would make it the equivalent
of about 15 coffee warmer hot plates running full blast. Using air
cooling is out as it would require enough air flow to launch the PC
into the air. Liquid metal cooling might work. At $0.15/kw-hr, this
machine will cost $1.15/hr in electricity to operate (without energy
management or shutting down un-used CPU's).
Of course there will be improvements in technology, but using the
existing available processes is a dubious proposition.
The real advantage of multiple cpu's isn't performance; it's
management. There's no reason to run all the cores flat-out all the
time.
John
.
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