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UEFI Configuration

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Alex James edited this page Jun 14, 2015 · 13 revisions

Before installing OS X, you should properly configure your UEFI BIOS to ensure maximum compatibility with OS X.

First, go over to the Save & Exit tab and Load Optimized Defaults. UEFI 1

After loading Optimized Defaults, go to M.I.T.\Advanced Frequency Settings and set CPU/PCIe Base Clock to 100.05, and if your RAM supports it, the proper Extreme Memory Profile (X.M.P.). UEFI 2

Then go to Advanced CPU Core Features and set the CPU Clock Ratio and the Turbo Ratios. If you are not overclocking, just set them to the default values, but don't set them to auto. This is needed for proper power management. UEFI 3

Go to BIOS Features and set Windows 8 Features to Windows 8 and disable Secure Boot. If your GPU supports UEFI GOP and you don't have any legacy OSes, you can disable the CSM (compatibility support module). Don't disable the CSM. There's a bug with the UEFI ROM for the FireWire chipset that will cause the GUID to fail to initialize, causing OS X to spam the console complaining about an invalid GUID. UEFI 4

Under Peripherals, set EHCI Hand-off to Enabled. If you have a dedicated PCI Express GPU, set Init Display First to PEG, and Internal Graphics to Enabled (not auto). If you are only using integrated graphics, set Init Display First to IGFX and set Internal Graphics to Enabled (not auto). Also verify that the SATA Mode is set to AHCI. UEFI 5

Save the changes to the UEFI configuration and exit. UEFI 6

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