I've been waiting to play this game since it came out. Unfortunately, it walked, more than "ran", on my old box. Thefore I built a new box. I'm now running a 2.6GHz Quad Core, 8 GB DDR2 240 pin PC2-6400 RAM, nVidia 280 GTX all on a nForce 750i motherboard. Now when I play GTA 4 it starts off beautiful...then it starts into slow motion...then back to normal...then back to slo mo again. I'm completely baffled as to what could be causing the slow down. I have the most recent drivers, well I switched to a slight older motherboard driver because Rockstar lists it as the "recommeded driver for GTA 4". If anyone has any ideas of what I could look at next to remove these slowdowns, I would appreciate it greatly!