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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 223.53+1.1%Jan 14 3:59 PM EST
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To: wbmw who wrote (236928)7/24/2007 1:35:29 AM
From: pgerassiRead Replies (3) of 275872
 
Dear Wbmw:

Don't you read? That 8W is at the CPU, not at the VRM input. You have to multiply by 1.3-1.5 depending on how good the VRM efficiency is. Second, not all MB makers push the boards to minimum power settings. Do you remember how long it took AMD for MB makers to even enable PowerNow?

And if you look at the low power states for Athlon 64 X2s here:

amd.com white_papers_and_tech_docs/33954.pdf

On page 30, look at the power for the 65nm 65W TDP 2.6GHz X2 5000+. It has the same frequency area as the E6700 but at lower power in the minimum C1E power state of 3.04A at 1.1V plus 350mW of I/O power. That's just 3.79W TDP. And thats that desktop 65W TDP that you said couldn't idle that low. Since it measured 8.8W at the VRM input, that puts the VRM efficiency at 43%. Using that on your 8W TDP when in C1E state, your Core 2 Duos use 18.6W, not far from the measured 20.4W. The E6700 still has a 12W TDP in C1E same as the E4300. Divide that by 0.43 and you get 27.9W. Evidently the VRM efficiency rises as more power is drawn. At 12W out and 20.4W in, VRM efficiency raises to 59%. And the AMD's include memory power and maintenance which don't happen with Core 2 Duo, but with the chipset and its NB and MCHs. I don't recall if C1E does ECC memory scrubbing on A64 X2s. And even the powerful 90nm A64 FX 74 using socket 1207+ with 3 HT links (1 coherent) and 2 DDR2 channels, uses just 12.25W in C1E with 4W of that going for I/O. And these are specs for Feb, 2007. Current K8s may even be lower now.

If you think Tyler based Turion X2s are going to be more than Brisbanes in idle power states, you are crazy.

Pete
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