PS3 - 256 MB of RAM, can run MW3 at 60 FPS.
Xbox 360 - 512 MB of RAM, can run MW3 at 60 FPS.
My PC - 4 GB of RAM, can only run MW3 at like 20-30.
Any reason for this? I know that RAM isn't the only thing that determines frame-rate but it's a pretty important factor.