
Don't come back crying that it screwed something....
Go in device manager, check properties of the GFX card, look in the detail tab then under Proerty check the Hardware Ids.
You will see stuff like this:"PCI\VEN_10DE&
DEV_0611&SUBSYS_00000000&REV_A2"
Stuff in bold is what matters.
Unpack the driver you DLed as normal, just cancel the installation.
Open in notepad the nv_disp.inf.
There two places where you will see similar stuffs as you just noted, one early in the file, the second in the end.
Ex:
The First:
"%NVIDIA_G92.
DEV_0612.1% = nv_G9x, PCI\VEN_10DE&DEV_0612"
The second:
"NVIDIA_G92.
DEV_0612.1 = "NVIDIA GeForce 9800 GTX""
Replace all DEV_XXXX with the one of your card.
Change the name string for your card.
You may use whatever.
Change only one card, no need to change all cards lol.
Remember that you will use a limited Beta drivers on a card not intended for it.