Based on the tests done so far, I'd recommend the following:
1. Test with 1.5v. memory. I checked on Corsair's website (click here) and notice all of the memory modules with the description you mentioned ("XMS3 8GB 1600") are 1.65v. I confirm the CPU itself is not tolerant to higher than 1.5v. "Intel recommends using memory that adheres to the Jedec memory specification for DDR3 memory which is 1.5 volts, plus or minus 5%. Anything over this voltage can either damage the processor or significantly reduce the processor life span." (qtd. in http://tinyurl.com/yfvduuk).
2. If the problem continues with 1.5v. memory, either test with another, compatible, testing processor or have your Intel(R) Core(TM) i5 Processor tried out on another compatible, testing desktop board.