The VRAM is limited to 256 MB. I'm just curious, is it a driver limitation that prevents it from accessing more memory from RAM or is it a hardware limitation? I'm wondering if it would increase graphics performance if there was away to allow the 9400M to access more memory than just the 256. If I have 4GB of RAM in my MB, I'd love to find a way to kick more than 256 over to the GeForce's way if it means better performance. I don't know a heck of a lot about GPU's so I figured I'd pick the collective MacRumor's Brain. I'm sure I'm missing a big part of the puzzle.