Check your motherboard manual for that. It will show you. To get in the bios, usually but not always, you have to keep tapping on the delete key on the keyboard until the blue settings screen appears while turning on the pc.
Once in there, search around for the DDR, memory, or chipset settings. The vdimm or memory voltage setting will be there. Look for the 1.5v setting. There shouldn't be anything else like that at 1.5v currently. If you believe you have the right one based on my description (DDR, VDimm or memory voltage) - then change that to 1.65v.
This is needed because you have OCZ RAM. They always need this bump in voltage. Your modules are intended and purposely made to run at this higher voltage.
I have OCZ Gold memory as well, but a slower machine and DDR instead of DDR3.