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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 231.80

+1.7%

Jan 16 3:59 PM EST

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To: j3pflynn who wrote (235602)	7/3/2007 4:08:48 PM
From: graphicsguru	Read Replies (1) of 275872

It's from a document dated Feb. It comes from this vd.verysell.ru realworldtech.com Hans' interpretation (below) is probably correct. The slides are talking about throughput improvements from doubling the number of cores. When you derate for the 15% lower clock speed of actual Barcelon vs. 2.3Ghz, the throughput improvement is rather unimpressive. Let's see. 1.4 * 2.0 / 2.3 = 1.21. So they're claiming that you'll get an average of 21% throughput increase for those server tasks by doubling your cores. Wow. I'm floored. I don't know how to break it to everyone, but if you replace a Woodcrest with Clovertown, you get a better throughput improvement than 21%. And Woodcrest outperformed Opteron to start with . . . . (yes, I've assumed linear scaling of performance with frequency to derate the numbers to 2.0Ghz just to get in the ballpark. But if Barcelona can't scale pretty well from 2.0Ghz to 2.3, it has even more issues than previously revealed). David Kanter (dkanter@realworldtech.com) on 7/2/07 wrote: --------------------------- > >I'm not sure about the scale on those relative barcelona performance slides. > >DK I would say they give the percentage of improvement of a two socket system (slide 71) and a four socket system (slide 72), when going from 3 GHz 2222's to 2.3 GHz Barcelona's This would correspond to a >40% median performance increase when 3 GHz SE2222's are replaced by 2.0 GHz Barcelona's (with a maximum of ~70%)

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