Yes it's PCI express,,and I flew abit today and just to try I set the setting to the highest setting and I was only getting arround 5 and 6fps,,that really sucks!!! some itmes 10 to 15 but I wish I had 20 at least.

I did some messures and I'm not even sure if I can fit the geforce 8800gts the specs says it's like 9'' long but I'm not sure if it is 9'' long from the actual Card or the whole thing from the mounting brackets,,,my old 6800GS is 8 1/2'' long tyhe actual card not messured from the brackets so the 8800gts it's like 1/2'' longer and I only got 1/4'' gap before it touches on the MB power cables.
So if you have the 8800GTS would you mind messuring how long the actual card is???

thank you