I’m running on a P5KC ASUS motherboard with quad 2.4GHz Q6600 and NVidia 8600GTS. I’m seeing a peak of about 730MB/s transfer rate, both to and from the device. The motherboard is definitely PCI-Express x16 and so is the video card (I don’t think the 8600GTS comes in anything BUT pci express x16).
PCIE16 should transfer at around 4GB/s. What I’m seeing is closer to PCI Express x1. I’m wondering what other people are seeing for transfer rates, and if there is anything specific I should do to boost the speed. I googled around a bit, looked in my bios, looks like it should “Just work”.
I’m seeing the 700mb transfer speed both, in the “bandwidth test” CUDA sample as well as my own CUDA programs. They are terribly bandwidth bound now so I would really like to get to the bottom of this. Anyone know of a non-cuda application that can tst GPU transfer speed? I wonder if this problem is specific to cuda or not.