Asrock z68 gen3...I miss the days of synced ram and FSB
Don't be lazy

Anyway you could set these to an XMP profile that matches their default settings, but the timings are really loose at the default clock. I don't have a machine here with your BIOS, so I can't send you screenshots, but you should be able to manually set the clock speed under the DRAM Frequency setting (I'd start at 1866), and then go into the DRAM Timing Control and change the first four values to 9 (DRAM tCL), 9 (DRAM tRCD), 9 (DRAM tRP), and 28 (DRAM tRAS). Leave everything else on Auto or whatever the defaults are. You could try changing the command rate to 1 (instead of the default 2), but let's get you stable without that first. I'd set the DRAM Voltage at 1.4v, and the VCCIO (or VTT Voltage) at 1.0v. Leave all other RAM-related voltages on "Auto." Try that and run Prime95 for a while and let us know.
Feel free to PM if you don't want to derail this thread with questions/comments. Or post a new thread in Memory and Storage and me (or someone else if I'm slow) will get you set up quick.