Mac Pro :: Quadro FX 4500 X2 Is Not Working?

I just got a PNY Quadro FX 4500 x2. I know some people has talked about Quadro FX 4500 before but after I got this card, I know it is different from single Quadro FX 4500 because it is two FX 4500 strap together, please refer to the product link here (URL)

I am currently using PC running Mac OSX 10.5.6 (iDeneb) and I think I probably need to flash this card before put into my computer. When I tried to use nvflash (the latest version) to flash the rom, I can back up two roms and it ask me two times when I used "nvflash -b" to back up each rom (rom 0 and 1). However, I can not put the fix rom back to my card. When I use "nvflash -4 -5 -6 -j" command. I know this must has something to do since my card has two roms.........but it is really beyond my knowledge and I don't know how to do it, when I tried to put the fix rom back to my card, it showed the error message below:

Checking for matches between display adapter(s) and image(s)......
Adapter: Quadro FX 4500x2 (10DE, 029F, 10DE, 0357) H:09:SP0 B:0A, PCI, D:00, F:00
Overriding PCI subsystem ID mismatch
Adapter: Quadro FX 4500x2 (10DE, 029F, 10DE, 0357) H:09:SP1 B:0B, PCI, D:00, F:00
Overriding PCI subsystem ID mismatch
No matches found

I think besides the flash rom problem, I also believe that I probably need someone help me to fix my original rom because the fixed rom I downloaded is not for FX 4500 x2, I couldn't find any fixed rom for FX 4500 x2, only FX 4500. Here I attach the original rom I back up from my card and hope some people can help me to look at it. Somehow I also think I might need to change my GFX string or something like that.

Again, this is just the problems I have found from now. After two weeks trying to search everything in the web I am very frustrating because it is hard to find people who use the same card like me. I am just a visual effects animator and I think some parts of flashing this card has gone beyond my knowledge. I know many people and genius here will know what's going on immediately and be able to help me out.

Here is my computer hardware configuration:

Motherboard: TYAN Tempest i5000XT (S2696)
CPU: Intel Xeon e5345 quadcore x 2
RAM: 6G ECC RAM
Sound Card: Sound Blaster Audigy 2 zs
Graphic Card: PNY nVidia FX 4500 x 2 1G
OS: Leopard 10.5.6