SLI in Registry?

[Mirra]

Hi.

is there a key or something in the Registry to enable SLI?
Or how is it done by the NVidia driver?

 

[Arcuivie]

Uninstall the display drivers that came with your card and install the latest drivers from the nVidia website (66.93 I believe). Then go into the advanced display properties (this can be done by going to the display properties from the control panel, click the settings tab, then advanced), click on the tab that has the name of your video card, select SLI-Multi GPU from the menu on the left, and then check the enable box.

 

[Mirra]

I know but I have a problem because when I enable SLI in bios the forceware drivers detect a 2nd display which is on the secondary card(of course it doesn't exist) and so I am not able to check the SLI box.
So I have to find a way to get rid of the ghost display or find a way to enable SLI in the registry.

 

[Arcuivie]

Have you tried removing the drivers completely and doing a reinstall of them? Driver Cleaner is a good tool to use.

As for the registry thing, I'm not sure, I wouldn't think so, since SLI is driver controlled.

 

[obeythefist]

I have a friend who is experiencing exactly the same problem with this motherboard. BIOS, NForce, Forceware drivers - none of it makes any difference. He clicks the checkbox for Enable-SLI, hits on OK, then the window flashes up stating (more or less) "The second display adapter will not be available when running SLI because the second graphics card will be used to power the first, please disconnect your second display when you restart your computer", the checkbox for SLI is then *cleared* and SLI is not enabled. There's nothing wrong with any of the hardware, everything seems to be working just fine, both cards are good, everything else in the system is perfect. There must be a component in the registry that tells the video driver to use SLI capability. What we need is someone with SLI to do a snapshot of a SLI disabled system and a disabled system and tell us what to do to enable SLI, because this seems to be a real flaw with the ForceWare drivers.

 

[JavaAddict]

Have you had any luck? I am having the same problem. I can only get it reenabled by using windows restore to put the machine back into the state I got it from the vendor.

The reason I disabled SLI is that I am also having a problem with using SLI on a 23 widescreen display. With one card, everything works, yet the menu screen for overclocking is missing. I do get a menu screen to adjusting my LCD. With SLI enabled, no LCD menu and the screen goes to garabage for any game that tries to change the resolution to anything other than the LDC default of 1920 x1600. (Hence, all)

 

[quattro1]

What kind of motherboard and what drivers are you using? Do you have the paddle on your motherboard flipped so that it is in SLI mode?

 

[JavaAddict]

Yes, the paddle is inserted correctly.

The problems seem to lie with true DVI connections and wide screen support. When you connect a analog lcd, you can select SLI and the driver will state that it needs to restart your machine. Upon reboot, SLI is enabled. You can run games with SLI no problem. You can run 3D Mark 03 (20755) and games run fine. However, add a widescreen LCD and nothing works. Menu options disappear, once you disable SLI, you can't get SLI reenabled. When you select enable SLI, you get the message that the displays connected to your second video card will go blank ... as SLI will support your primary display. (Of course, no displays are connected to the second video card and never had any connected.) You hit ok, and the SLI box is unchecked. Ugh!!!

If you leave SLI enabled, or reconnect your Widescreen LCD after enabling SLI using an analog monitor, the screen is garabage at anything other than the default resolution. Not even minor interpolation. Hence, you have your new 23 screen to match you new system, but they don't play well. What was Nvidia thinking!?! If you have the money to fork out for two 6800 Ultras, don't they think we would also have the cash for the latest large screeen monitors?

 

[obeythefist]

My buddy is having the same problem but he's just using a single analog monitor. DVI displays haven't even come into the equation.

It occurs on all BIOS's up to 1003-005 (but we haven't tried much more because he experiences severe problems with his SATA drive with that BIOS, we had to step back down to 1002)

We've tried a number of different ForceWare drivers with the same results.
Clean windows builds, the lot.

The "secondary display" bug is still there.

 

[obeythefist]

Actually we found the problem!

Here is the cause and solution:

Some displays will detect "unusually" by the video cards. This is why some people have the problem and others don't, with *identical* systems in all other respects. My friend plugged in a newish 17" Sony Trinitron display and his SLI just worked. On an older HP model, he got the "seondary display" warning and his SLI setting would uncheck itself.

So basically switching monitors will solve this problem and allow SLI to be set and used.

Thanks for all the comments. Hope this can help anyone with similar issues.