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4x r9-280x/sky700 6GB cards memory allocation issue

Question asked by liwoog on Mar 14, 2014
Latest reply on Mar 27, 2014 by liwoog

Hi,

 

When we run more than 2x 6GB cards (either 4x R9-280x or 4x Sky700) in a 4 card machine, the AMD driver will not allocate more than 3GB (with 4 cards, for 3 cards, see below) per card even with the GPU_MAX_ALLOC_PERCENT and GPU_FORCE_64BIT_PTR set.

 

No problem with 2 cards.

 

Any pointers?

 

Thanks,

 

Lionel

 

PS: Here is the relevant clinfo when 3 Sky 700 cards are installed, I have highlighted the abnormal memory availability:

  Max memory allocation: 631242752

  Global memory size: 1173356544

  Unified memory for Host and Device: 0

  Max memory allocation: 6144655360

  Global memory size: 6315573248

  Unified memory for Host and Device: 0

  Max memory allocation: 6144655360

  Global memory size: 6315573248

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