It does change the timings, that's for sure. At least it tries to tighten them if possible.
For example, if I set DRAM to AUTO and 5:6 ratio, memset performance level goes from 10 to 7 for Standard vs. Extreme. That's quite a bit.
And that's with BIOS 5Fh.
It used to change mem subtimings as well with BIOS' older than F5h (you could see them in CPU-z), but not anymore.
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