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.

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.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.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.