It does look to be a hardware problem. One of the dumps crashes at IRQL 1e, which is the power failure level. What are the specs on the PSU(s).
BugCheck 100000D1, {c0, 1e, 1, 853cca20} <-- IRQL 1e
Probably caused by : ntoskrnl.exe ( nt!ExAllocatePoolWithTag+3e1 )