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Not to sure about the Quad Cores, but i was at a technology show when the Duals were being released and they were quoting a Dual Proc Dual core is approx 1.7 times as fast as its equivalent Single Core..
Yes, I've seen that 1.7 number thrown around before. I just need the paperwork to back that number up. For the cost savings and the power savings, 1.7 is very fair.
Single vs Dual..
Dual vs Quad..
I suppose its always worth remembering, the Quad Core H/D's are no quicker than the Dual or Single core H/D's..
It always depends on what your Apps are doing..
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The real performance increase depends on the applications.
With normal SPEC benchmarks the increase is between 70% and sometimes 100%. But these benchmarks hove nothing to do with the real world - especially not with virtualization.
acr already mentioned the magic 1.7.
To back it up take a look at the spec site (but see my note above).
I asked an AMD rep this recently at a VMUG meeting, and for the coming quad cores he said we could expect a 40% to 50% performance increase.
This Dell whitepaper:
compares the Intel 5160 (Dual core 3Ghz) with the 5355 (Quad core 2.66Ghz) in the PE2950 and performance gains vary between 47% & 69% depending on the VM.