Going to upgrade my computer to either a gtx 580/1.5gb ir 3.0gbFrist of all here are my specs: Cool Master half 932 windows 7 64 bit, fsx on its own drive, velcoraptor, evga x58 sli le, 980x processor, overclocked to 4.4ghz, 6gb of mushkin memory, and 2 video cards gtx 285, but use only one since fsx does not take advantage of sli, using driver 280.26 and nivida inspector as well/ along iwth 27" DEll monitor. still see some stuttering with PMDG 737-800 ngx, that is my major issue.Here are some questions if you can give me some good real decednt advise1- do you think with the gtx580 that might smooth things out a bit ????? Yes, I know its expensive2 would 3.0gb be more beneficial than 1.5gfb for FSX-would appreciatee all of your advise, and other thing have tired other drivers they all seem the same thats why its time to finally update my video card, instead of buying a whole new system which I cant afford now.