Can't Run 3600MHz RAM at 3200Mhz

[maklabouhlel]

I'm running i5-12600/B760i Aorus Pro DDR4/Ballistix 3600Mhz DDR4. Loading XMP runs the RAM @3600Mhz but I want to run it at 3200Mhz as this is what is recommended for the cpu. But the system won't boot at 3200Mhz with or without loading XMP. Can anyone shed some light as to why this is?

I did try some native 3200Mhz RAM which works fine after loading XMP.