Clock for clock,Agena core was ~5-6% slower than Kentsfield core(in stuff people actually use on their computer-no superpi lovin' and smilar).This would mean that you would need ~3.78-3.8Ghz Agena chip to equal a 3.6Ghz Kentsfield(which will never happen since there are no 3.8Ghz Agena chips that can run like that 24/7).Deneb on average should be from 7 to 10% faster than Agena,clock for clock, in real world apps and with equal settings(ram,L3 etc).This means Deneb at 3.6Ghz is more than a match for Kentsfield(I'd say it would handily beat it in majority of applications-excluding SPi,Sisoftsandra and the likes).Also,at 3.6Ghz it will draw less power and dissipate less heat.At 4Ghz it would be no contest between the two since Kentsfield would never reach that clock for 24/7 and would be a good deal slower than Deneb...
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