Crucial Ballistix 1GBx2(2GB) overclock problem

Hey guys.
I have some problems w/ my memory when i overclock my system.
Here's what I have.

CPU - E6550 2.33ghz @ 3.2ghz(oc'd) w/ Zalman 9700 LED
Motherboard - EVGA 650i Ultra
Memory - Crucial Ballistix 1GB x 2 (2GB) 4-4-4-12 @ 2.0v

I just bought Zalman 9700 and installed it and im rele happy about it. 1.35v vCore and only 40~50' on full load.
ok. here's my problem. I was running Prime95 and it stopped within a min bc of hardware failure. I thought i didnt feed enough voltage to my CPU, but i did a torture test w/o any memory use and i was fine for an hour and i still have it on. so no failures w/o memory use. so i figured out tht it could be my rams are causing the problem and ran a memtest for 7 hours. I got like 160 errors. WTF?
wut do u guys think about this? its def my ram problem?
would it make any change if i change the slots?
what should i do?