13900KF / DDR5 Overclocking

May as well try to get a conversation started here.

Currently have a 13900KF under a D15, my first Intel DDR5 system.

Ram gearing has me a bit stumped, using a kit of F5-6400J3239G16GX2-TZ5RS on a MSI Z790I Wifi. Clocks looks to be stable under gear 2 however jumping to gear 1 I fail to post

My assumption is gear 1 would be better for latency however this is my first foray into DDR5.

Any advice would be appreciated.