GTX 295 1/2 working

I have a EVGA GTX 295 v2 that only seems to be running 1 GPU. I'm using it for SETI@Home and all I get are errors from the same GPU. Any know of a good way to test both GPUs to see how they operating and 1 GPU at a time?

I'm using XP Pro 64bit as well.

I'm not sure if you can test one GPU per time, but try with Unigane Heaven and compare results with another GPUs.