I have a 1090t on an MSI 790FX-GD80 with 4x2gb Crucial 1333. Specs are CPU 4200 MHz, CPU-NB 2600 MHz, HT 2000 MHz. My ram passes Memtest at 6-6-6 20 2t, but I can't get it to work less than 1333 7-7-7 20 2t. Any suggestions on how I could get this stable at 6?