I dont play quake or unreal, but I dont experience speed and performance degredation except on battle realms, my gaming experience is fine, i usually turn the 4X anti aliasing mode in games that doesnt need too much CPU and graphics card power, btw the games i played are Soul Reaver 2, Metal gear solid, ff8, counterstrike and red alert 2 and i dont experience problems turning 4X anti-aliasing, oh the reason why i turn 4X anti aliasing is that the games i currently playing (Final Fantasy 8) doesnt need too much CPU and graphics card power and they dont give any difference when turning 4x anti-aliasing and off anti-aliasing