Well I seem to have a problem that others are having as well.
EVGA nForce 680i SLI motherboard
8GB Corsair DDR2 1066
Q6850 Core 2 Extreme
Quadro FX 4600 in Slot 1 PCI-E
Tesla C870 in Slot 2 or 3 PCI-E
Drivers: Nvidia CUDA drivers Vista 64 177.84, CUDA Toolkit 2.0, CUDA SDK 2.02.0811
Monitors: Two Dell 24â€ DVI
Operating System Vista 64bit SP1
I have done an uninstall and register clean of previous drivers. I installed the CUDA drivers, SDK and Toolkit ( listed above). Windows Device Manager shows the Quadro FX 4600 and the Tesla C870.
When I run â€œSimple multi-GPUâ€ from the SDK it only reports finding one device the Quadro FX 4600. When I run any of the Benchmarks or N-body it gives me the same results at having only the Quadro FX 4600 installed.
When I open the PhysX Properties is does not offer any selection for multi GPU.
Since the Tesla does not have any video connectors in the back I have no way of performing the â€œVista Fixâ€ that requires a monitor connected to the second GPU card. I have gone into the Windows Display Settings and set the 3. (Default Monitor) on Nvidia Tesla C870 the same resolution as the monitors on the Quadro FX 4600 (1920 x 1200) as well as check marked â€œExtend the desktopâ€¦â€, but when I click Apply it does not apply. I think this trick only works if you have an actual monitor connected to the card. Again the Tesla has no connector to connect a monitor.
I have also experimented with moving the Tesla from the SLI slot #2 to PCI-E slot #3. This did not solve the problem. My motherboard does not have jumpers or settings in the BIOS to turn SLI ON/OFF. To be expected the Nvidia Control Panel does not offer SLI anyway since the two cards are not identical.
Please help to resole this issue.