Well that card is designed for a 8xpro agp slot. You need to first tape over the correct pin
to convince you mac that it is a 4x. Also, that card take a TON of juice to operate. If you have
extras like lights, fans, or hds, you may find yourself with not enough juice to run it. Good luck, I would love to see one of these run in an older mac. One other thing. You wont get
the same performance because of that 4x bottleneck. Keep us posted, I wanna see this thing