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I did the following:

Needs["OpenCLLink`"]

OpenCLMersenneTwister[50]

(per documentation) on both my Dell Inspiron 530 Desktop PC (Radeon X1300/X1500 Series card) as well as my Mac Mini (Intel HD Graphics 3000 512 MB) (new 2 months old)

both returned:

OpenCLLink::nodev: OpenCLLink failed to detect a usable device.

But I verified with another friend who has a much older Mac Pro and on his Mac it worked. What should I do?

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Radeon X1300? Um, 2005 called and they want their video card back... perhaps you could try installing the Intel OpenCL SDK? As for the Mac, it's not clear what the problem might be. Can you run OpenCL programs other than Mathematica? Worth noting also is that performance on your hardware is going to be worse than if you didn't use OpenCL in the first place. – Oleksandr R. Nov 14 '12 at 13:42
works ok on my iMac from 2011. – cormullion Nov 14 '12 at 19:28
Did you try OpenCLQ[] ? – Rolf Mertig Nov 14 '12 at 20:19
Hi @Rolf Mertig, not sure how this OpenCLQ[] relates to the problem, can you clarify? – sebastian c. Nov 15 '12 at 0:09
It has to return True, and when you run it the first time it will download some necessary "paclets". Just try it (after Needs["OpenCLLink`"] of course) – Rolf Mertig Nov 15 '12 at 0:10

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