I have 4x16gb kit - G.SKILL Trident Z Neo 64GB (4x16GB) RGB DDR4 3600 (PC4 28800) F4-3600C16Q-64GTZNC.
Just testing an upgrade from 12900k and got BSOD immediately.
Memtest fails with 4 sticks running at XMP, but does not fail running only one or two sticks.
Memtest does not fail on 4 sticks at XMP on the 12900k
So far memtest is running without any errors (yet) on the 14900k downclocked to 3200 mhz with all other settings at xmp levels.
14900k + MSI z790 tomahawk WIFI DDR4 BEWARE 4 ram sticks wont operate over 2666mhz, only 2 sticks go to 3200,3600,4000mhz. I used corsairs vengeance pro 4000mhz cl18 4x8gb kit. funny thing is the ram works perfectly in 2 other MSI motherboards with my 11600k and my 12600. MSI tech Support says memory OC is not guaranteed. BUYER BEWARE.