Quote Originally Posted by clo007 View Post
OK, So I got my new UD3R, thinking my other one was screwed up. If you can remember, for some reason my motherboard will not run 2 sticks of ram no matter what size. So I bought a new mobo [edit...] No more hang but I still can only run one module. If I put 2 modules in it won't even get to bios.
Does anyone have any clue what this may be from? I am thinking maybe a PSu issue, as my HX520 is almost 2 yrs old now, [...] I am so puzzled right now. I have 5 different sets of ram that I have tested with all the same effect...1 stick=mobo runs, 2 sticks= mobo won't post even to bios.
This is the exact same problem I'm having - I have a UD3P. I've tried 2 sticks of G.Skill Pi Black 6400 and Corsair DHX sticks. In combination, in alternate colored slots [to try and force single channel mode], etc etc. Will not run 2 sticks no matter what.

Are you getting a continuous series of short beeps when you put two sticks in?

I have a Seasonic S12 600W, and it's a really solid PSU that is not being even slightly stressed, so I can't believe it's the PSU...