I just followed the instructions on that russian tutorial.

However, after I modified the bios, and tried to open it with VBE7 program (just to verify it was valid) it says the checksum is wrong and won't open it. Then I actually flashed it to the card, and it showed the new information to be blank on the card like it normally says old info was Taithti PRO or whatnot, and new info says Taithti Pro.. But this time it was all blank for the new info, so I pussed out and put back the original bios on it. In never rebooted the system.

Is that normal for the new info fields to be blank, I wouldn't think so. Thanks.

Here's what ATiwinflash output on the modified bios.
C:\Users\1a\Desktop\biosstuff\atiflash_274>ATIFLASH.EXE -f -p 0 0mod.ROM
Old DeviceID: 679A
New DeviceID: 0
Old Product Name: TAHITI PRO GDDR5 3GB BIOS
New Product Name:
Old BIOS Version: 015.025.000.099.000000
New BIOS Version:
Flash type: GD25Q10TCP
20000/20000h bytes programmed
20000/20000h bytes verified

Restart System To Complete VBIOS Update.

After that I reverted to original.