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fgaiddon
03-24-2010, 07:10 AM
Hello,

I am planning to buy a MacPro with two Nvidia GT120 to do some heavy OpenCL computation. I am wondering how are managed these 2 cards in OpenCL. Are they 2 different OpenCL devices (each with 4 compute units) ? Or is it an unique device with more compute units (8 compute units) ?
Many thanks

fabien

dbs2
03-24-2010, 11:10 AM
The two cards will show up as separate CL devices and you will have to figure out how to split your work across them.

With that said, the GT120 is a very low-end card. If you want to do serious work you'll want to get some GTX285s and put them in. With appropriate power splitters you can fit two of those and a GT120 for graphics in a Mac Pro. The GTX285s sold on the Apple store will work with OpenCL on OS X out of the box. Of course your best bet would be to wait for a Fermi card, but who knows when there will be an Apple-supported version of that available.

fgaiddon
04-02-2010, 01:51 AM
Many thanks for your response. I thought that graphic cards shipped with Mac Pros were good...
Maybe, I should wait for the new mac pro...
The GTX285 could be a good alternative.