OS X 10.9 Mavericks has for the moment CUDA support for Nvidia Fermi and later only.

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Profile Jord
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Message 51361 - Posted: 19 Nov 2013, 17:18:10 UTC

When OS X 10.9 was shipped, Nvidia's included driver would not support CUDA on any Nvidia GPU.
A slight fix has been released by Nvidia, but for Fermi and newer type GPUs only (GT/S/X 400 series and up). To get these to work with CUDA you need to:

* Manually install the 5.5.28 CUDA driver from NVIDIA. CUDA is not supported by the stock driver shipped by Apple.
* Install at least BOINC 7.2.28. Older versions disable CUDA on the dual-GPU MacBook Pro.

When you have an older videocard, you're out of luck and will have to wait until Nvidia release a fix for that.
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Message 53152 - Posted: 13 Mar 2014, 11:34:53 UTC - in response to Message 51361.  

Good news for the users of the older videocards on the Mac, Nvidia has released a new CUDA driver for OSX which reportedly supports the sm_1x GPU architecture on 10.9/Mavericks again!

Do test please and let us know!
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Message boards : GPUs : OS X 10.9 Mavericks has for the moment CUDA support for Nvidia Fermi and later only.

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