3.MemOK! button
Installing DIMMs that are not compatible with the motherboard may cause system boot failure, and the DIAG_DRAM LED near the MemOK! button lights continuously. Press and hold the MemOK! button until the DIAG_DRAM LED starts blinking to begin automatic memory compatibility tuning.
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Refer to section 1.2.8 Onboard LEDs for the exact location of the DIAG_DRAM LED.
The DIAG_DRAM LED also lights up when the DIMM is not properly installed. Turn off the system and reinstall the DIMM before using the MemOK! function.
The MemOK! button does not function under Windows® OS environment.
During the tuning process, the system loads and tests failsafe memory settings. It takes about 30 seconds for the system to test one set of failsafe settings. If the test fails, the system reboots and test the next set of failsafe settings. The blinking speed of the DIAG_DRAM LED increases, indicating different test processes.
Due to memory tuning requirement, the system automatically reboots when each timing set is tested. If the installed DIMMs still fail to boot after the whole tuning process, the DIAG_DRAM LED lights continuously. Replace the DIMMs with ones recommended in the Memory QVL (Qualified Vendors Lists) in this user manual or at www.asus.com.
If you turn off the computer and replace DIMMs during the tuning process, the system continues memory tuning after turning on the computer. To stop memory tuning, turn off the computer and unplug the power cord for about
If your system fails to boot up due to BIOS overclocking, press the MemOK! button to boot and load the BIOS default settings. A message will appear during POST reminding you that the BIOS has been restored to its default settings.
We recommend that you download and update to the latest BIOS version from www.asus.com after using the MemOK! function.
Chapter 1
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