I appreciate the hard data from a different PCIe system. I came to the 5000ns estimate because I tested some null-kernel a long time ago on a GPU. Basically a

I appreciate the hard data from a different PCIe system. I came to the 5000ns estimate because I tested some null-kernel a long time ago on a GPU. Basically a "hello world" of GPU kernels, and I tested to see how long it took for the kernel to be called. I hear that GPUs have sped up a bit since my test a few years ago, but I'd expect it to still be around 5000ns for a "CPU-GPU ping-pong".