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r7 270x memory allocation issue

Question asked by nan on Sep 13, 2014
Latest reply on Nov 14, 2014 by dipak

Hi,

 

I'm having serious issues with some R7 270x. It runs 2 threads and each thread allocates a 512MB, 256MB, 128MB and 4KB buffer in global device memory (in total: ~1.8GB). On some 270x I observed that only ~1.3GB are allocated in device memory and ~500MB in host memory (Catalyst 14.6 and Catalyst 14.7 on Windows7 64bit). The performance decreases by a factor ~10 if some memory is allocated in host memory. Using a R9 280x I observed from time to time similar behaviour but a reboot always helped (my R9 290 never showed this). The 270x shows this behaviour permanently on some computers.

Here are GPU-Z screen shots: http://savepic.su/4323086.png and http://savepic.su/4321038.png

 

Does someone know why not all memory is allocated in device memory?

 

-- NaN

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