Even at 10% diff it's not enough to make up for 20% better perf/watt.
Wow, so 2 SAS drives @15W each (what you think it's 5W?

It's not 60W but it is a drop of 30W), who knows what RAM...hmmm, why should we care? To put AMD in better light?
Accept it, while the 24 core AMD system does better in performance only, it doesn't stack up in perf/watt.
And unless I missed some shopping sites, a SINGLE Opteron 8435 is more expensive than TWO X5570!
Opty 8435: $2650
http://www.google.com/products?q=AMD...8435&scoring=p
Xeon 5570: $1330
http://www.google.com/products?q=Int...5570&scoring=p
Quad-socket AMD mobos are not ice-cream cheap either, while Dual Nehalem boards peanuts compared to that.
Even space is not in AMD's favor, since Nehalems can fit in much less than a quad-socket AMD system.
There's not really a single point in Istanbul from above.
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