Asus M4A87T User Manual page 40

2. MemOK! switch
Installing DIMMs that are incompatible with the motherboard may cause system
boot failure, and the DRAM_LED near the MemOK! switch lights continuously. Press
and hold the MemOK! switch until the DRAM_LED starts blinking to begin automatic
memory compatibility tuning for successful boot.
M4A87T
M4A87T MemOK! switch
• Refer to section 1.12 Onboard LEDs for the exact location of the DRAM_LED.
• The DRAM_LED also lights when the DIMM is not properly installed. Turn off the system
• The MemOK! switch does not function under Windows® OS environment.
• During the tuning process, the system loads and tests failsafe memory settings. It takes
• Due to memory tuning requirement, the system automatically reboots when each timing
• If you turn off the computer and replace DIMMs during the tuning process, the system
• If your system fail to boot due to BIOS overclocking, press the MemOK! switch to boot
• We recommend that you download and update to the latest BIOS version from the
1-28
and reinstall the DIMM before using the MemOK! function.
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
DRAM_LED increases, indicating different test processes.
set is tested. If the installed DIMMs still fail to boot after the whole tuning process, the
DRAM_LED lights continuously. Replace the DIMMs with ones recommended in the
Memory QVL (Qualified Vendors Lists) in this user manual or on the ASUS website at
www.asus.com.
continues memory tuning after turning on the computer. To stop memory tuning, turn off
the computer and unplug the power cord for about 5–10 seconds.
and load BIOS default settings. A message will appear during POST reminding you that
the BIOS has been restored to its default settings.
ASUS website at www.asus.com after using the MemOK! function.
Chapter 1: Product introduction