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Слушайте, я вам наврал, перепутал вывод, взял не от того устройства

гигабайт - это на CPU (памяти для OpenCL рапортует 4 гига). А на обеих GPU (Nvidia, ATI) - 256M. Памяти - гиг на каждом GPU.

Вот в форумах нашел:
For every buffer object you can allocate 1/4th of the total memory (this is dictated by OpenCL spec, it is not an ATI limitation). For example, if you have 1Gb of total memory you can allocate a maximum of 256Mbytes, if you have 2Gbytes you can allocate 512Mbytes, and so on.

http://forums.amd.com/devforum/messageview.cfm?catid=390&threadid=127849

Я не понимаю, как именно это dictated by OpenCL spec, наизусть их не помню, но готов поверить на слово :)

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