I've just together a new system. Gigabyte MB 990XA UD-3 v3.1. 16GB Gskill 4x4GB Red 1.5v each. Ace power supply 950 watt. Dual Ati radeon HD 5970x2 eg 4 GPU. AMD 8530 8 core No turbo boost 4ghz is enough. Cooler master water cooled cpu.. My point is in the memory adjustment for higher ram clocks systems boots ok @ 1600Mhz when 1866mhz is picked system will not boot. Any thoughts. Case is NZXT Hiddern power supply. Main hdd is 4tb nas 7200rpm 2nd is 10tb WD