For the record, acceleration hardware is supposed to accelerate your framerate, not decrease it! [laughs] That seems like its just a messy tradeoff that they made there. You certainly want your physics hardware to improve your framerate. That means that the physics hardware might in some cases be able to update more objects so you can actually render another frame, so you need to have some sort of rendering LOD scheme for that to manage the object counts, and obviously you don't want to take this ultra fast physics card and plug it into a machine with a crummy video card. You really want to have a great video card to match up with your physics hardware and also a decent CPU to have your system in balance to really be able to take advantage of the full thing.