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To: BUGGI-WO who wrote (197984)	5/19/2006 3:21:49 PM
From: dougSF30	Read Replies (1) \| Respond to of 275872

More like 5W to 6W, and they are not going to be simultaneously driven to max power, so you can't simply multiply.

To: BUGGI-WO who wrote (197984)	5/19/2006 7:40:08 PM
From: pgerassi	Read Replies (1) \| Respond to of 275872

Dear Buggi-wo: 8.5W is for the MTH per FB-DIMM channel. Add another 8.5W for the AMB in each FB-DIMM and with just 4 FB-DIMMs (one for each channel), you get 68W of additional power. Add 14W for the Blackford NB and you get 82W additional for a 2S Woodcrest system. Divide by 2 and you have to add 41W to each Woodcrest TDP to match. Suddenly to use the same amount of power, Opteron would need to use 41W more, so with 65W Woodcrests, Opteron needs to use 106W and with 80W Woodcrests, Opteron needs to use 121W. Not even Opteron DC SEs use that much and there are likely to be 3GHz ones (x90s) real soon now. In addition, to get the amount of memory possible in 16 DDR2 DIMMs which 2S Opteron systems can, you need to add 6 more AMBs per Woodcrest for another 51W each socket. All of a sudden, to compete with 95W Opterons, Woodcrest will have to stay under 3W. There is no way they will do that except perhaps while halted. That's a lousy performance per watt, (0 divided by something positive), isn't it? Then there is the added latency in multi FB-DIMMs per channel making it even worse for Woodcrest. And while Opteron 2S gets 25.6GB/s of memory BW, Woodcrest will try with only 17GB/s. And one other thing Intel supporters don't want a customer to remember is that the on die memory controller speeds up with increasing clock rates while Blackford stays the same for every NGA clock speed. Thus higher speed bins means lower latencies for Opterons while NGAs stay the same. Pete