Afew things. What the hell is Slam? You don't need a 3ghz computer to run BF1942 on high even and it still looks great. Can't compare to Quake 2 man, your on crack. I ran it maxed out on my 2.4ghz cpu awhile ago and it ran flawless though now I'm at 3.2ghz.
Thats another thing. This HDR seriously needs a good computer. I remember if you turned it on in Far Cry, man did it lag. I'm on a 3.2ghz P4, 1.5gb PC3200, and 6800 GT 256mb overclocked. I bet you need a monster for HL2 to handle it as well although I will admit HL2 runs so much better than Far Cry so it might be better at handling this as well. Adios!
Face your Fears, Live your Dreams, No Fear -Manny Pacquiao