MemtestCL is a program to test the memory and logic of OpenCL-enabled GPUs, CPUs, and accelerators for errors.

Usage: memtestCL [flags] [MB GPU RAM to test] [# iters]
Defaults: GPU 0, 128MB RAM, 50 test iterations
Amount of tested RAM will be rounded up to nearest 2MB

Available flags:
--platform N ,-p N : run test on the Nth (from 0) OpenCL platform
--gpu N ,-g N : run test on the Nth (from 0) OpenCL device on selected platform
--license ,-l : show license terms for this build
--forcecomm, -f : DO send test results to Stanford (don't prompt)
--bancomm, -b : DO NOT send test results to Stanford (don't prom pt)
--ramclock X , -r X : Specify RAM clock speed (for returned results) as X MHz
--coreclock X , -c X : Specify core/ROP clock speed (for returned result s) as X MHz

MemtestCL is available for Windows, Linux, and Mac OS X-based machines. By default, MemtestCL will test 128 megabytes of memory on the first OpenCL device on the first OpenCL platform found,running 50 iterations of its tests. On typical machines, each iteration will complete in under 10 seconds with these parameters (the speed will vary both with the speed of the card tested and the amount of memory tested).

The license of this software is Freeware, you can free download and free use this memory optimizer software.