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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 207.67+2.2%3:59 PM EST
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To: dougSF30 who wrote (239949)9/7/2007 1:15:36 PM
From: PetzRead Replies (2) of 275872
 
Intel's dirty little secret -- poor frequency scaling

re: AMD folks have publicly said that cHT is a problem w.r.t. higher frequencies?

Yea, maybe at 4 GHz. Doesn't seem to be a problem at 3.2 GHz, does it? Ever heard of 8224SE?

are you ignoring the fact that he's comparing 4-socket systems? Tigerton vs. 4S Barc?

I can't get the Chinese site to translate, but if I were you I wouldn't take much comfort from "clock-for-clock" comparisons at 2 GHz. Here's the scaling percentages for Clovertown from 2 GHz to 3 GHz:

SPECint      67%
SPECfp       56% from 2 GHz to 2.67 GHz -- no results for 3 GHz!
SPECint_rate 52%
SPECfp_rate  36%
note: all above based on Intel submission using Supermicro motherboard. 2-socket numbers, 4 socket undoubtedly worse.

Yes folks, it's true. Even using SPECint_rate, which the AMD bashers here claim is a good predictor of server performance, you get a 26% performance increase by increasing the clock 50%! Floating point? Forget about it! Even single thread, single core scaling is abysmal. Anyone who buys Intel's two highest speed grades, which also require more power, is stupid.

So Intel "just as fast" at 2 GHz may translate into Intel 20% behind at 3 GHz not many days from now.

Petz
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