The VRAM test at maximum utilization in conjunction with Prime95 Large FFTs will stress FCLK and is recommended when testing FCLK stability.

Be sure to run Normal Mode as Extreme will not use as much RAM. The more you tune your ram, the harder it'll be to be stable in this test. The Large AVX2 CPU test is a great stability test for your CPU and RAM at the same time.On Intel-based systems, SSE appears better for testing IMC voltages, while AVX appears better for DRAM voltage. Note that AVX and SSE can vary in error detection speed.OCCT with the dedicated memory test using SSE or AVX instructions.Replace the window size with your total RAM (minus some margin for Windows) divided by your processor's available threads (e.g., 12800/16 = 800 MB per thread). If you experience issues with all threads crashing upon launch with the extreme config, it might help to edit the row 'Testing Window Size (Mb)=1408'.It should say 'Customize: Extreme1 if loaded. I wouldn't recommend the AIDA64 memory test and Memtest64 as they are both not very good at finding memory errors.You should always test with various stress tests to ensure your overclock is stable. Temperatures and Its Effect on Stability.Primary, Secondary and Tertiary Timings.

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