Does the ram have an xmp profile? And 32gb at 1866mhz is a pretty hefty load on the cpu memory controller. Have you tried upping sa or io voltages, description of theese depends on the board. Tbh, for games 1600mhz is grand on ib or hw. Games dont show any noticeable benefit with high clocked ram. 8gb of 2400mhz ram here, pointless upgrade for a gaming system tbh.