GeForce 7800 GTX... the best card for a PCIe G5 Power Mac?

I have started out on the rocky road to upgrade the graphics card on my Power Mac G5 Quad 2.5GHz running Mac OS X 10.5.8. The standard card, a GeForce 6600, does not do justice to this wonderful computer, and struggles with any serious video work.
The first step is easy – deciding on the best card. A little Googling shows that the GeForce 7800 GTX wins hands down over the competition.
The next needs patience – these cards appear from time to time on eBay; I will need a 512 MB PCI-e version (not 256 MB) as I am running 10.5.
I've waited a month or two, put in a winning bid and the card has arrived. Now all I need is the code to flash the ROM to make it work in myG5. Not so fast! I'll need a 128kb ROM chip! The idea of using a soldering iron terrifies me, so I'll have to find someone, who does this sort of thing for a living, to remove the 64kb ROM from my 7800 GTX and solder on a 128kb ROM.
But what's is the right spec/manufacturer/supplier for the 128 kb ROM?
If I am lucky my friend with the soldering iron may know. If not, I'm stuck. I've not been able to find this information anywhere on the Internet.
Now all I need is the right code for the ROM. It seems that there are two versions that people have used: one, which seems quite common, is lightly edited Quadro FX 4500 ROM code which does not use the full power of the 7800 GTX, which after flashing reports itself as a FX 4500; the other, which seems to be as rare as gold dust, has been fine-tuned to use the 7800 GTXs full potential. Cards flashed with this version report correctly as 7800 GTX. I really want this optimised code, but neither version is available from any of the usual places.
Can anyone please help?

I've waited a month or two, put in a winning bid and the card has arrived. Now all I need is the code to flash the ROM to make it work in my G5. Not so fast! I'll need a 128kb ROM chip! The idea of using a soldering iron terrifies me, so I'll have to find someone, who does this sort of thing for a living, to remove the 64kb ROM from my 7800 GTX and solder on a 128kb ROM.
Many thanks to japamac, who kindly sent me an e-mail which put me on the right track re finding the ROM code, editing it and flashing.
I also now know that I no longer have to worry about soldering ROM chips. Yippee! The 7800 GTX code has been 'shrunk' to fit on a 64kb ROM.

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Hey, best regards for all users. I have a question about changing graphics card. I'll be gratefull for all help.
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Hello, I got a AMD64 3200 (socket 754) processor with a K8N Neo Platinum motherboard.
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