NVIDIA has released their alternate graphics drivers for OS X Yosemite 10.10.4. These are separate from the drivers Apple ships as standard, and should be considered experimental. These drivers have been known to solve OpenCL issues with certain applications, as well as providing better native GPU power management for certain devices. NOTE: These drivers are currently the only method to get full acceleration for NVIDIA GeForce GTX 750, 750Ti, 960, 970, and 980 'Maxwell' graphics cards. There are no current Macs with these cards, so support is absent natively in OS X. If you've installed the drivers before, you may get a notification to update to the new drivers from the built in System Preferences pane. Download the NVIDIA Web Drivers (10.10.4 Build 14E46) (NEW 2015-07-30) http://www.nvidia.com/download/driverResults.aspx/88655/en-us How to Install the Web Drivers: In order to use the alternate drivers on a CustoMac, you must first install the driver package. Also make sure to choose NVIDIA Web Driver using the standard menubar or system preference pane then reboot. NOTE: In addition to setting nvda_drv=1 to NVRAM, as required by real Macs, NVIDIA now adds nvda_drv=1 kernel flag to /Extra/org.Chameleon.boot.plist automatically. There are no additional steps to take. Related: http://www.tonymacx86.com/os-x-updates/162108-os-x-10-10-4-update.html http://www.tonymacx86.com/graphics/...ate-graphics-drivers-10-10-3-346-01-02-a.html http://www.tonymacx86.com/graphics/...ate-graphics-drivers-10-10-2-343-02-02-a.html http://www.tonymacx86.com/graphics/...ate-graphics-drivers-10-10-1-343-01-02-a.html http://www.tonymacx86.com/threads/n...01-01-with-maxwell-geforce-gtx-970-an.143435/ http://www.tonymacx86.com/graphics/...ate-graphics-drivers-10-9-5-334-01-03f01.html NVIDIA Releases Alternate Graphics Drivers for 10.9.4 (333.01.02f02) NVIDIA Releases Alternate Graphics Drivers for 10.9.3 (331.01.01f01) NVIDIA Releases Alternate Graphics Drivers for 10.9.2 (331.01.01) NVIDIA Updates Web Drivers for 10.8.5 (313.02.03f01) NVIDIA Updates Web Drivers for 10.8.4 (313.01.02f01) NVIDIA Releases Mountain Lion 10.8.3 Graphics Drivers Please note that these drivers should be considered experimental. If you aren't having any issues, do not install- the native OS X drivers work great for most people.