Prime95 errors with i5 661

[idata]

I just set up a new system and ran prime95 to test for stability. I almost immediately got errors.

Is it possible that it could be the cpu as the RAM is stable (as tested by 20 rounds of memtest86 resulting in 0 errors)

Info:

My motherboard is GA-H55-USB3,

RAM is OCZ Platinum (OCZ3P1333LV4GK)

According to OCZ the RAM should be set at 7-7-7-20 with the mem multipier to 10X and the mem voltage at 1.65V

Note: I am only using one 2GB stick of RAM as the other stick is faulty.

Is there some other setting I should adjust in the BIOS to compensate for these changes? ie. Vcore?

[idata]

Hello;

In order to test if the processor is actually the problem I recommend to test it on a different system, also you can try to different memory on the desktop board