Hi Konrad,thanks for your explanation, very clear but I have one doubt the Q8200 has a clock of 2,33 GHz while the E8600 3,33 GHz does it mean that the Q8200 is still better having 4 CPUs or the E8600 is better.I'm not so expert.Best regards

Offhand it is hard to say exactly which one is better between the Q8200 and the E8600 for FSX but my money would be on the E8600. The extra 1 GHz on two cores with the larger L2 cache will help a lot with FSX. Furthermore the E8600 easily overclocks to 3.6 if not 4.0GHz. More if you know what you're doing. Quad core overclocking is a lot less reliable than dual core and the Q8200's low 7x multiplier makes it even harder. A 450 FSB only gives you a 3.1GHz chip...Having said that the Q8200 does offer some very good performance when compared to a Q6600 in games which use all 4 cores. FSX SP1 does use all 4 cores so "on paper" the Q8200 should perform as well as the Q6600. Without some direct performance comparisons in FSX between these 3 chips it will always remain a hard one to answer for sure.Konrad