I am running Samsung 30nm ram memtesting single sticks at a time on my Asrock Extreme 3 970 to resolve an instability issue I am having with my UD3H that also claims to be unsupported. Basically every stick of 30nm I have seems to pop up errors but it memtests no problem in my 1155 systems with memtest including the UD3H. I don't know what the hell is going on. I have reverted both systems to stock clock rates, everything is jedec default. I have 5 sticks. They all pass in the Z77E and the UD3H memtest from usb booatloader but they are unstable as fuck in 4x4 configuration in the UD3H, no matter the settings. They all fail memtest fast in the Phenom II system. Check signature for the model #, its all listed. Do you guys have any suggestions? I am going to try it in an x58 system and a few other 1155 systems in the next few days to see wtf is going on. How is this possible? I've tried re-arranging dimms etc. Maybe somethings aren't meant to be... I don't want to change motherboards just to get my ram working. I have also tried an i5-2550, 3770k, and a xeon with this ram. Similar results. Unstable in the 4x4 mode in the GA-Z77X-UD3H. I am only memtesting in the asrock extreme 3 as its a workhorse for that stuff.