Mac Pro Early 2008 with ASUS 8800GTS

Hi guys
I have Apple Mac Pro Early 2008 2x3.2GHz Xeon Mac OS 10.6.8 and stock graphic card 8800GT
Recently my graphic card gets damaged and didn't work. I bought Asus 8800GTS P/N:EN8800GTS/HTDP/640M/A
I checked this card on PC - it works, on Mac - don't work
I found ROMs on this site: http://forum.netkas.org/index.php?topic=2187.0
First i flash this card with 8800GT EFI64
Result: PC - don't work, Mac - don't work
After this I flashed it with 8800GT EFI32
Result: PC - don't work,...

Mac Pro Early 2008 with ASUS 8800GTS