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OpenCL same cards but different transfer rates.

Hi,

   I have one hd7990 card in my pc, after crossfire it, in the opencl code, i can find two hd7970 GPU devices.

   But when i transfered data to them, they are in different rates. One is almost double time of another.

   Attachments are the CodeXL screen capture pictures.

   Anybody can tell me why?

   Thanks.

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1 Reply

Hi,

     It seemed that i had found the solution. I tried to reset the frequency of the card using 'aticonfig --odsc' command, and it turned out that both cards inside the hd7990 nearly work at the same data transfer rate.

     But I found my hd7990's Pci-e data transfer rate can just only reach to 4GB/s in one direction(each hd7970 inside it reached to 2GB/s), I know the Pci-e x16 can work to the peak bandwidth 8GB/s one direction, how can i raise up my 4GB/s rate?

     Thanks.