Asus TUF Z390-PRO GAMING, Manual

Page: 23 / 88

TUF Z390-PRO GAMING 1-9
Chapter 1
1.1.6 Onboard switch
The onboard switch allows you to fine-tune performance when working on a bare or open-
case system. This is ideal for overclockers and gamers who continually change settings to
enhance system performance.
• Refer to section
1.1.8 Onboard LEDs
for the exact location of the Mem_LED.
• The DRAM LED also lights up when the DIMM is not properly installed. Turn off the
system and reinstall the DIMM before using the MemOK! II function.
• The MemOK! II switch does not function under Windows
®
OS environment.
• During the tuning process, the system loads and tests pretest profiles. It takes about
30 seconds for the system to test one set of profiles. If the test fails, the system
reboots and tests the next set of profiles. The system will reboot multiple times when
training, once the system has completed the training process the Mem_LED will turn
off, please refrain from doing anything before the Mem_LED turns off.
• Due to memory tuning requirement, the system automatically reboots when each
profile is tested.
• 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 5–10 seconds, then set the
MemOK! II switch to disabled.
• Ensure to replace the DIMMs with ones recommended in the Memory QVL (Qualified
Vendors Lists) at www.asus.com.
• We recommend that you download and update to the latest BIOS version from
www.asus.com after using the MemOK! II function.
1. MemOK! II switch (MemOK!_II)
Installing DIMMs that are not compatible with the motherboard may cause system
boot failure. The switch is enabled by default, allowing memory re-training when the
motherboard is unresponsive due to memory problems. The Mem_LED will light up
while re-training, and turn off when the re-training is complete.