Yeah, it is strange, I play the game at 1024x768 with everything on Maximum, 4x FSAA and 16X Aniso with No Soft Shadows and the average is between 39 and 64fps, the lowest is around the 17fps (Horrible) and the maximum is about 138fps, but the stuttering is terrible, when you move to other rooms, you can see the game acting like it was in pause (Half a second long) and the hard drive reading like crazy. And when I activate FSAA the drop in performance is barely like 25% max in the worst case scenario, may be I'm GPU or VRAM Bandwidth limited. May be 1GB is not enough considering my RAM is Dual Channel and have very low latency (2-2-2-5) Changing the AGP Aperture Size doesn't help, it decreases the performance, so I have it to 64MB which shows the best performance.