The 8600 GT is a joke in my opinion and does not deserve to be part of the x600 GT series. If anything, what we have see here today should have been performance delivered by the 8500 GT, not the 8600 GT. The results really spoke for themselves, as the GeForce 8600 GT was 12% slower in Far Cry, 17% slower in F.E.A.R, 7% slower in X3: Reunion and 19.5% slower in Company of Heroes. The only two games that the 8600 GT came out on top in was Prey (15.5%) and Supreme Commander (27.5%), making a two out of six effort very poor indeed.
Check it out over here.