Quote Originally Posted by bingo13 View Post
ASUS has three sets of the OCZ Platinum 3P1600EB4GK kits, all three exhibit different characteristics on this board, two of the kits have different specs but the same part number. I ordered another set from NewEgg to try, same held true here for my first Corsair kit (to be fair) as one had the same problems as the OCZ, but the second one is humming along at 1600 easily. I am also swapping out my GSkill and Patriot kits this week for newer kits. This regression testing is getting expensive...

Kinda looks like a IC or SPD change to me at first glance but it appears to go much deeper now. That said, getting a BIOS fix is proving difficult due to all the changes, one memory set works great, the next one does not, get the one that does not work up to speed, and another kit all of a sudden has problems. By the way, two other P45 DDR3 boards I have are experiencing the same problems, so it might be a core BIOS code problem.
I had two sets which acted the same.....they all use Micron, they should be acting the same, maybe its the board acting different??? If it was an spd issue, one was working, and the other was not, i think tony would know about it.