Prob not the DRAM (easy enough to test each stick), may be mobo, but basically the 055 can't carry 4 sticks at 1600, even with a 965 it can be hard to run 4 sticks. Have you looked at the AMD/1600 set up thread:
http://www.gskill.us/forum/showthread.php?t=7688
http://www.gskill.us/forum/showthread.php?t=7688
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