As the title suggests, after almost 2 weeks of troubleshooting, i cant seem to use my 8800gt 512meg video card in the x16 pci-e slot on my ep43 gigabyte motherboard.. If I do, the computer eigther freezes on the first bootup screen, or freezes on the xp logo startup screen.. When i installed windows from scratch, it would boot up fine in the x16 slot up until I installed the nvidea drivers, soon after I started the driver installation I get a black screen with a flashing dos style prompt which is unresponsive, when i resart it freezes on xp logo... When the computer was in the shop getting fixed, they tried my video card in another pc and it worked fine.. The card also works fine in the x4 slot, although graphics doesnt look as crisp as what my old abit ip35 motherboard did with less ram.. The computer place basically lied to me and said this motherboard has 2 x16 slots, and said it doesn't matter what slot its used in, according to the spec's it has a 4X and a 16X slot.. http://www.gigabyte.com.tw/Products/Motherboard/Products_Spec.aspx?ProductID=2846 Can anyone shed some light as to why I cant get my 8800GT to work in the X16 slot, I feel as though i'm running a ferrari on diesel at the moment, and I play games like flight simulator X which I know require good graphics setups.. Thanks.