I did a memtest for my ram and passed. Did prime 95 cpu stress test without a problem. Ran 3dmark 11 bench mark and pc system mark system benchmark test and my system ran it okay. But only sandra sisoft lite 2012 sp5 would make my system freeze. Its really bugging me to why. All drivers updated to latest. The only thing i can think of is i updated my bios a few days ago to 1606 on my p8z77-v. Any thoughts or recommendations.