I didn't mean to mislead you, the ROM I was referring to is for Intel-based Macs and it seems you're getting a PPC Mac??? If that's the case your flashing options are very limited. The best flashing forums went offline before PCI-e cards became the norm. There are lots of AGP ROMS available but I don't know of any reduced PCI-e ROMS for PPC 512 MB cards. You might want to max out your RAM and try your G5 with the GeForce card for a while before trying to upgrade the video card.