Nvidia SLI Unattended

[Dynaletik]

Hey out there, is it possible to activate NVIDIA SLI on a Multi-GPU system?

I got 2 GeForce 6600GT cards in my pc since 10 minutes, now how can I activate SLI unattended? Is there a regkey? I didn't find anything. (Maybe I'm too stupid.)

[Bâshrat the Sneaky]

Isn't it the software that activates it?

[Dynaletik]

Hm, yes. You have to activate it in the ForceWare driver menu. But there must be a place, where the setting is saved. And this is the place I need. =)

[Bâshrat the Sneaky]

I can't find it... I WISH I had SLI

Use RegShot or RegSnap to determine the changes in the registry after enabling/disabling it.

[kenshin]

I believe I may have found what you're looking for...

Under HKLM\SYSTEM\CurrentControlSet\Control\Video, there should be a few keys, two of which representing your two video cards. From there, there should be a "0000" key, which has a "MB_Enable" key. If you set that to "01 00 00 00", it should enable SLI. I'm not sure if you're going to be able to pre-determine the parent key's names, though...

[Dynaletik]

Seems to be right, for me it is this code:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{00D4FE2C-2B80-49F1-8362-CF32DEAC70FC}\0000]
"MB_Enable"=hex:01,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{00D4FE2C-2B80-49F1-8362-CF32DEAC70FC}\0001]
"MB_Enable"=hex:01,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{E5F8B27F-3185-4315-8FFB-1F8440EAAD1E}\0000]
"MB_Enable"=hex:01,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{E5F8B27F-3185-4315-8FFB-1F8440EAAD1E}\0001]
"MB_Enable"=hex:01,00,00,00

It seems to enable SLI, now I hope that it works on a new installation, because I don't know, how Windows generates the

{00D4FE2C-2B80-49F1-8362-CF32DEAC70FC}\0000]

entries.

Thx kenshin