aj_guillon

nvidia oclBandwidthTest - HD 5970 is very slow

Discussion created by aj_guillon on May 16, 2010
Latest reply on May 18, 2010 by omkaranathan

I tried some of nvidia's OpenCL examples for bandwidth tests, and it shows that the bandwidth between my new HD 5970 and host is extremely slow... much slower than even my 9600GT.

Here are the results:

./bin/linux/release/oclBandwidthTest Starting...

WARNING: NVIDIA OpenCL platform not found - defaulting to first platform!

Running on...

 Device Cypress
 Quick Mode

 Host to Device Bandwidth, 1 Device(s), Paged memory, direct access
   Transfer Size (Bytes)        Bandwidth(MB/s)
   33554432                     196.7

 Device to Host Bandwidth, 1 Device(s), Paged memory, direct access
   Transfer Size (Bytes)        Bandwidth(MB/s)
   33554432                     603.7

 Device to Device Bandwidth, 1 Device(s)
   Transfer Size (Bytes)        Bandwidth(MB/s)
   33554432                     97552.1


PASSED

Is this a physical problem with the card, or is it the OpenCL implementation from AMD that makes the data transfer rate so slow?  What, if anything, can I do to fix this?

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