on the Physx bit, when Physx games require the feature with Ati GPU owners, it's pushed to CPU mode rather than GPU accelerated (which Nivida cards do), hence often physx games offer disable or lower quality options to compensate, in some cases it's hard to tell the difference as the physx itself may only be lightly used so no performance hits. I've got APB reloaded myself and currently ATI GPU owner... never seen performance hit with it on in that title.