I just built my system about a week ago. At first I kept getting constant BSOD. Then I switched the RAM, and problem solved. Now I am getting BSOD again. Not as much as before, but I get about 2 - 3 times a day. The only change I made is added an old IDE hard drive for extra space(Only for media files).
I suggest you memtest them first.
Download Memtest86. http://www.memtest.org/#downiso
Burn to cd
Load from cd
Test each stick individually.
If there's errors rma your ram making a note that you memtested it/include # of errors.
For the current RAM, I just ran the test when the RAM is clocked at 1600Mhz. I got about 4 errors within test #5. I change it into 1333Mhz, and ran the test for 11:30 hours. I got one error. Here's the picture that i took: