ASRock X99M Extreme 4 Motherboard - MCE issue

I've been using this motherboard with an Intel Xeon E5-2630-V3 in our office server for about 2 months now. About a week or so ago we started getting MCE (Machine Check Errors) in the syslog as unRAID (Linux) was booting up. Nearly immediately and reliably, the Virtual machines (win10pro64) would crash the entire server while running. After pulling the entire machine apart and trying all parts (including the CPU) in another (personal) machine I was unable to reproduce the errors outside of this motherboard. After rebuilding the server using this motherboard I am still receiving the MCEs during boot, though now the VMs do not seem to crash. I am fairly confident due to the above troubleshooting that there is a physical issue with the MB itself. I have of course physically examined the motherboard and socket, but have found no visible issues. I have tried changing setting in BIOS to try and isolate and disable the issue to no avail. The mcelog (logged below) denotes the error as being related to the cpu cache, but I'm of the thinking that it has more to do with how the MB communicates with those banks, than some issue with the cpu itself.

As we are a small school office and really can't afford to have the server down at this point, I'm hoping (grasping at straws) that there is someone out there that might have another suggestion or experience in this matter, aside from sending it in for repair/replacement. We are completely open to any and all suggestions. 

~# mcelog
Hardware event. This is not a software error.
MCE 0
CPU 0 BANK 17
MISC 8cf00031e0000086 ADDR 5f000000
TIME 1466125355 Fri Jun 17 10:02:35 2016
MCG status:
MCi status:
Error overflow
Uncorrected error
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Generic CACHE Level-2 Eviction Error
STATUS ee2000000004017a MCGSTATUS 0
MCGCAP 7000c16 APICID 0 SOCKETID 0
CPUID Vendor Intel Family 6 Model 63
Hardware event. This is not a software error.
MCE 1
CPU 0 BANK 18
MISC 1cf00031e0000086 ADDR 5f100040
TIME 1466125355 Fri Jun 17 10:02:35 2016
MCG status:
MCi status:
Error overflow
Uncorrected error
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Generic CACHE Level-2 Eviction Error
STATUS ee2000000004017a MCGSTATUS 0
MCGCAP 7000c16 APICID 0 SOCKETID 0
CPUID Vendor Intel Family 6 Model 63
Hardware event. This is not a software error.
MCE 2
CPU 0 BANK 19
MISC 54f00031e0000086 ADDR 5f100000
TIME 1466125355 Fri Jun 17 10:02:35 2016
MCG status:
MCi status:
Error overflow
Uncorrected error
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Generic CACHE Level-2 Eviction Error
STATUS ee2000000004017a MCGSTATUS 0
MCGCAP 7000c16 APICID 0 SOCKETID 0
CPUID Vendor Intel Family 6 Model 63