Ok, your ram is rated for 1600mhz, what voltage is the ram set to in your bios? OCZ usually needs a bit higher than stock voltage to be stable. Try bumping the voltage up by 0.1 volts, and give it a try.
If you need further help getting your OCZ ram to perform correctly, please ask for configuration help on the OCZ forums. http://www.ocztechnologyforum.com/
By the way, what motherboard are you using?