Omega likes B-Die single sided modules, a total of eight cos of T-Topology. So 8x8GB B-Die should reach the best performance.
tRC is not usually displayed in Asus Bios's. Other manufacturers like Gigabyte (some boards) display it and let force it, but not Omega.
Asus x670e Hero, 7950x, TG 7000, Master 4090, 970 PRO, 860 EVO, Intel 750,
SN850, SN750, 840 Pro, 2xSkyhawk 4TB, Pioneer S12U
EVGA T2 1600, Silverstone TJ11, Custom LC, Acer Predator x35, Philips OLED