dddh@node9 ~ $ ./a.out 
[a.out] starting...

Checking for multiple GPUs...
CUDA-capable device count: 2
> GPU0 = "GeForce GTX 680" IS  capable of Peer-to-Peer (P2P)
> GPU1 = "GeForce GTX 580" IS  capable of Peer-to-Peer (P2P)

Checking GPU(s) for support of peer to peer memory access...
> Peer access from GeForce GTX 680 (GPU0) -> GeForce GTX 580 (GPU1) : No
> Peer access from GeForce GTX 580 (GPU1) -> GeForce GTX 680 (GPU0) : No
Two or more SM 2.0 class GPUs are required for ./a.out to run.
Support for UVA requires a GPU with SM 2.0 capabilities.
Peer to Peer access is not available between GPU0 <-> GPU1, waiving test.
PASSED