We had power glitch in our office and then Dell R430 showed LCD error: 

PCI1318 Fatal error,

CPU0704 CPU 1 machine check error detected. Power cycle system

There was 2 CPUs in machine so I placed CPU2 on CPU1 socket and it worked for a couple of days and then got the same error again. 

I ordered 2 Intel E5-2620v3 2.4GHz 85W CPUs and replaced them. But still get the same error. Please advise.