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Supermicro Z390 9th Gen OC Guide (Page 5)

By: Steven Bassiri from Jan 25, 2019 @ 10:00 CST

Memory and Stability Testing


Memory overclocking is pretty straightforward; we just set Memory Profile to "XMP1", which sets our voltage, frequency, and timings for the DRAM. If you change it from XMP to "Custom," the XMP timings will still stay, allowing you to fine-tune the manufacturer recommended timings. It is a convenient feature. Memory voltage can also be found on the memory page.


We also want to mention CPU Power Management Control is under the CPU menu and not the Overclocking menu. You can find individual C-states here, but whether the C-states are disabled or enabled doesn't matter too much due to the power of the Windows Power Plan. In Windows, you can set your power plan to High-Performance if you want the CPU to stay at maximum overclocked frequency all the time (use Override voltage). In Windows, you can also set the power plan to "Balanced" if you want the CPU frequency to go up between your maximum OC and base frequency depending on load (use Adaptive voltage mode).


While our CPU will pass Blender and Handbrake AVX benchmarks at 5.2GHz, they will not pass Prime95 with AVX, so we settled on an all-around 5GHz overclock, which not only lowered our thermals but also is easier on the CPU. We recommend using HandBrake or Blender for a quick OC test, but to leave a bit of thermal headroom since you will probably have to increase voltage a bit down the road when testing with Prime95.


Prime95 should be used for 24/7 stability testing, but it's pretty brutal on your CPU. SmallFFTs will stress the CPU the most, but Blend tests will test a bit of everything (core, uncore, memory, etc.). If you are using an AVX offset then we recommend you use both the older non-AVX Prime95 program and the new one with AVX, since your CPU will run at different frequencies depending on whether or not AVX is engaged. If you are using no offset, then just run the new one. Try an hour first, and then go for 24 hours or so. If you have any questions or comments, please leave them below.

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