Maximum PC

I don't know if this belongs here, but I am trying to setup a separate CUDA card in my rig for learning(and hopefully in the future do it for research) CUDA programming.

My build consists of an AMD Phenom II x 6 1100T, 16GB of RAM, 2 Radeon HD 6870s in crossfireX, the CUDA card is a GTX 560Ti, all on a Gigabyte GA-990FXA-UD5 motherboard, and an OCZ 1250W power supply.

The first time I tried placing the 560Ti into my rig, Windows flipped out. And at the time, MSI Afterburner said that the drivers for the AMD cards were not properly installed or were not working properly. I set about fixing that issue. While I was fixing it I saw that Windows was trying to install both the NVIDIA and the AMD drivers for Windows. However, I fixed the problem for the AMD cards first, since they were top priority(still had a project to do....). Once the problem with the AMD cards were solved, I started working on the NVIDIA card. I re-placed it in the rig and booted up the machine. I tried installing the WHQL drivers for the card, and it said that no NVIDIA hardware was there. I checked the Device Manager, lo and behold, no NVIDIA card there. I have tried reseating it(but put it at the same spot on the motherboard) but to no avail.

Should I seat the 560Ti at the main PCI-Ex16 slot and install the stuff drivers and such and then move it to where I normally put it? Or is there some other way of setting up a CUDA card...?

The system should see the card in device manager. You said it wasn't there, so either the slot you have it plugged into is dead or the card is dead. To check the Nvidia card uninstall the amd driver and pull the both amd cards out of the system and plug the nvidia card in slot 1. If you get no post you know the card is dead.

Nasty

I have looked at the card while the machine is on, and the fan n the GTX 560Ti spins....so I do not know....I will test it out again when I get the chance(I'm heading back to my apartment today from my parents').

Just because the fan is running doesn't mean the GPU isn't dead.

Nasty

I realized that a bit after I said it.... I hate to say this, but, after setting up the rig in my apartment, and trying something out(that was not part of your suggestion, Nastyman, sorry), it is fixed, and I did not know how it is fixed.

While I was setting the rig back up, I thought about trying something out, so I plugged in my DVI connector into the NVIDIA card and sure enough, no signal. So I shut down the computer and unplugged the DVI from the NVIDIA card and plugged it back into my main 6870. I start up the computer again, log in to Windows, and after booting up(since I use a mechanical drive still, it takes a while), Windows tells me I have updates. I check the updates to see what they were, and one of them was for an NVIDIA display driver.....I then opened up the device manager and lo and behold, it said it had a third VGA controller..... So I guess I somehow managed to either not seat the NVIDIA card all the way in, or I seated it in such a way that either some or none of the PCI-E pins between the motherboard and the card connected(I don't know if that could possibly happen).

tl;dr The card miraculously fixed itself, or by something that I inadvertently did.

Well, ya got it fixed and that is all that matters!

Nasty