As of now, no game that I know of uses >4GB even running Vista 64. The only reason I could see getting 8GB of RAM would be if you do a lot of video editing or 3D work, or if you were building a server which could actually use it.
__________________ QX9650 @ ... | Asus P5Q-E |2x2GB Dominator @ ... VisionTek 4870 @ 825MHz/4.6Ghz|WD 640GB Black PCP&C 750W Silencer | HT Omega Claro X3350 @ 4187MHz |