Hi guys, spec as follows: X79-UD5 3930K 32GB (8 x 4GB) Corsair Vengeance 1866Mhz GTX 680 256GB Crucial M4 Basically, was running fine with 4x 4GB sticks on vengeance for the last 3 months, stuck in the other 4, boot looped. Reset CMOS, left the CPU clock alone and set XMP to 1866, boot loop. Changed RAM voltage to 1.55V, IMC to 1V, VTT to 1.2V, set XMP back to 1866, still boot loops. Anything I'm doing wrong here? Edit: Memtested fine, motherboard can see 32GB on both 1333 and 1600.