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This possibly a noob question, but my searching didn't turn up an answer. I built a Hackintosh and the system is running OS X 10.9.1, but the graphics performance is not as expected: Redraw is slow and flickering for example when moving a window. One possible reason: The card is supposed to have 2 GB GDDR5-RAM, but the Mac System profiler shows it as having only 7 MB (see below). The screen is connected via HDMI to the GTX760. I tried to run OpenMark 1.6 to test OpenGL, but that gives the message "Unable to choose right pixel format for this device." The settings in org.chameleon.Boot.plist are as follows, but also with IGPEnabler set to "yes" the flickering <key>GraphicsEnabler</key> <string>No</string> <key>IGPEnabler</key> <string>No</string> From Mac System Profile: Display: Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 7 MB Vendor: NVIDIA (0x10de) Device ID: 0x1187 Revision ID: 0x00a1 Kernel Extension Info: No Kext Loaded Displays: Display: Resolution: 1920 x 1080 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes