Hi, Jer, I apologize if you feel "aged setup" was meant in a bad way (really just a fact of life with computers these days). I'm a heavy Mac user as well, and also had a very similar card to yours in my MacBook Pro. Needless to say, the CRJ would not work. To be more than frank with you, I'm quite surprised your dual core computer with only 256MB of vram can handle XP 10 with this add-on so well. We'll wait for Philipp to chime in here and see if he can figure out the culprit.