what is a quick cpu video card performance

GPUs has better memory bandwidth than CPU once the data is on the card. So in this instance, you might expect roughly 4x.Ĭaveats on why you might do better (or see results which claim far bigger speedups): I believe you need to cut that down by a factor of 4 for Fermi class non-Tesla to get to the double precision rating.

Note that the rating for GTX580 is for single precision. You can do similar computation for theoretical memory bandwidth.įor example, 1581.1 GFlops for a GTX580 vs. Thus, an upper bound is to divide the theoretical GFlops rating of a top end GPU by a top end CPU. Overall, it's fair to say that GPU is better at computation than CPUs. It depends very much on the algorithm and how efficient the implementation can be. adding a low budget card for video, and using the onboard video for GPGPU tasks Update 2 Quite often using a GPU that is shared with video output for this is not optimal. But the advise to check the border conditions thoroughly still stands. Update Newer GPUs seem to be able to upload/download and calculate at the same time using ping-pong buffers.

Pretty much the same thing applies to combining results of different GPU cards. I've seen this turning a claimed plus into a negative, because the upload/download time alone was longer than the main CPU would require to do the calculation. While there are a few cases where this doesn't matter (both are small or there is a second stage calculation that further reduces the result in size), usually one does have to transfer the results and initial data.

I'm in imageprocessing, and read many an article on the subject, but quite often in the GPU case, the time to upload input data to the GPU, and download the results back to main memory is not included in the calculation of the factor. Moreover only a small percentage of algorithms (the ones that deal without much shared state) are feasable with GPUs.īut I do want to urge you to be critical about claims. Your question is overly broad, and very difficult to answer.

What is a quick cpu video card performance