We have purchased a HP ML 350p G8 server and a GTX 680 to do some CUDA testing. Everything runs fine, except the bandwidth D->H or H->D is only pcie 2.0 speeds. (Running the standard bandwidthTest confirms this). We have tried both the 4.2 devdriver and the 5.0 preview devdriver. We are running RHEL 6.2
The output from lspci shows that the card is not being recognized / activated as a pcie 3.0 device:
21:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 680] (rev a1) (prog-if 00 [VGA controller]) ... LnkCap: Port #0, Speed 5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <4us
Any ideas on how to get this to work properly?