Configure RAM speed for test?

[Dinsdale]

Hi, is it possible to configure the RAM speed for Memtest86? The default test uses 4800MHz which is the JEDEC#7 profile for my Corsair DDR5 RAM instead of the 5600MHz XMP profile set in the BIOS. After nearly five hours the test shows no errors at 4800MHz but I'd like to test at 5600MHz to be 100% sure as I'm in the process of debugging an intermittent boot error.

[David (PassMark)]

MemTest86 doesn't attempt to set the RAM speed nor timings.

It just uses whatever values you have set in BIOS (or if you have set nothing, then whatever the default BIOS values are).

[Dinsdale]

Thanks for the reply David. I've tested several times with RAM set at XMP-5600 in BIOS but frequency during the test is always 4800MHz. Memtest86 is doing its job correctly so can any conclusion be drawn from that which could indicate a faulty memory controller or faulty RAM? The system is stable once booted.

I've tested with a BIOS embedded version of Memtest86 and made a short video to show selected speed and transition to start of test.

[David (PassMark)]

Again, MemTest86 doesn't set the speed.
The speed it reports is the hard coded SPD data from the RAM sticks. This is normally what the BIOS would be using (except there are often multiple profiles to pick from). But in an overclocking situation you won't be using the recommended SPD values. So MemTest86 won't display the speed being used in this case.