My friend has two 8800gtx's in SLI he's running 1680x1050 on his monitor and recently just installed xp64. The problem is that when he loads into L4D his framerate drops to like 20 fps, yet when he ran it on xp32 it ran fine at like 170+ fps, can anyone explain this issue?
![[H]ard|Forum](/styles/hardforum/xenforo/logo_dark.png){kind=logo}