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I did test it with 2.1v.Are you testing 1 stick at a time in Memtest? If not, take out 1 stick and test 1 at a time. You likely have a bad stick there.
EDIT: Did you manually change the DRAM Voltage to 2.1? Or did you leave it at Auto? If it's still on Auto, it's being undervolted.
We don't care about overclocking like some companies do. We honor our warranties no matter what.
I would test each stick alone first. I they both have errors you have another problem; probably settings. A trip to our forums is a great idea. We can help troubleshoot and set you up with an RMA if needed.
http://www.ocztechnologyforum.com/forum/forumdisplay.php?f=46