X399 OC Guide | Page 14

Advanced Notes For experienced users, here are some notes that may aid you If you try to manually adjust your memory timings you will notice that at above 2666 system memory multiplier your CAS Latency timing when measured in Windows will always go up to the next even number. For example a CAS Latency timing setting of 15 in the BIOS will show a setting of 16 in Windows. If your settings are too aggressive you might see the two following codes on your Diagnostic LED: 00followed by no monitor signal : Turn off your PSU for 20 seconds and then turn it back on. 00 followed by monitor signal : It’s all good. It happens few times instead of OC. OC followed by no monitor signal: CMOS the motherboard. 78 : Try to press the “Reset” button few times. If it doesn’t pass it again then CMOS the motherboard. 4F : If the poster stops there eventually the motherboard will switch to the backup bios. In order to avoid that CMOS the motherboard. On Ryzen Threadripper the Northbridge frequency is tied to memory frequency. 3200 DDR4 frequency is 1600 DDR frequency which gives us 1600MHz of Northbridge frequency. Last but not least, always tighten the screws of the socket at the very end. 13