I have two Nvidia 8800GT cards. They are SET up in SLI formation inside the computer, but I do not get confirmation of that from the software.

The Device Manager LISTS only one card and there is no SLI option on the Nvidia Control Panel under 3D. PhysX configuration is all it has. I have loaded the latest drivers.

Could this be a hardware problem?

Your thoughts please...

SLI connector cable in place ? ?

Does this MBoard support SLI ? ?Another thought: Possibly one of the cards is under-powered? This is an ODD problem if you have both cards hooked up right. I used to have two 9600gt's in SLI, I recall having a similar problem and resolved it by simply re-seating the video cards.

Good luck!The bridging is down to drivers from what I remember. At some point, Nvidia made the bridge optional. Perhaps that only applies to certain cards, though.

You might have to enable SLI from the Nvidia control panel. It isn't turned on by default. At least it didn't use to be.

(I went ATI) The SLI bridge is used to reduce bandwidth constraints of your chipset by allowing data to be sent directly between the two cards. While it is possible to run two nVidia cards in SLI WITHOUT the bridge, it can cause severe performance decreases especially in HIGHER end cards. Your best bet is to use it.This system in the past did run SLI - but I don't recall exactly when. I think it was over a year ago.

There is no SLI option available in the nVidia control panel, only physx under the 3D heading.

I do have the SLI bridge attached and the cards are connected to the power supply. It is VERY dusty in there though.

I will try to switch the cards and see what happens.

Thanks

Do some housekeeping...