hi i am building a system from scratch and i have all my parts except the os.i am using the quad core q6600 go stepping processor.i do a good amount of gaming crysis,flight sim, far cry etc.i have 2x1gb of corsair c4d 6400 dominator version 1.2 could get more but my question is will the 32bit hold back the q6600 as far as performance or is it better run with the 64? i have a purchased hp computer now its an athlon x2 dual core 5000.with 32bit vista ultimate .3gb ram never had a pc with the quad core or a 64bit version os.would love some pro and con advice .have heard compatabilty problems with the 64 .some have said the quad shines on the 64 bit but sounds like a double edged sword.i'm confused.