Hi Guys Ive just managed to get a PC ATI 4870 working my Mac pro 1.1 and with the Apple bootscreen but something strange is happening. I found some instructions on on how to create a mac rom from the pc rom by adding the efi part to it. Now heres the odd bit. It will only boot in slot 2 with with the pcie system config set at x1 if you change it to x8 it refuses to be seen. If you stick it in slot 1 as it runs at x16 it cant be seen. I know slots 1 and 2 work as i still have the old nv7300 and been testing. Ive also tested other 4870 roms, again it wont work in slot 1 at all and x1 in slot 2 Any thoughts?