NMI messages and MCEs on HP ProLiant DL585 G5/G6 or DL685 G5

Issue

• NMI messages are being received on HP ProLiant DL585 G6 systems:

  Jan 12 22:47:05 example kernel: Uhhuh. NMI received for unknown reason 30. 
  Jan 12 22:47:05 example kernel: Dazed and confused, but trying to continue 
  Jan 12 22:47:05 example kernel: Do you have a strange power saving mode enabled? 
  

• System rebooting or hanging without generating core dump following above NMI errors

• System generates a Machine-Check Exception (MCE) referencing bank 4 (indicating Northbridge or DRAM on AMD processors):

CPU 1: Machine Check Exception:             4 Bank 4: ba00000000070f0f
TSC 622520147de MISC e00c0ffe01000000

HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 1 BANK 4 TSC 622520147de [at 1867 Mhz 0 days 1:0:13 uptime (unreliable)]
MISC e00c0ffe01000000 
MCG status:MCIP 
MCi status:
Uncorrected error
Error enabled
MCi_MISC register valid
Processor context corrupt
MCA: BUS Level-3 Generic Generic Other-transaction Request-no-timeout Error
 BQ_DCU_READ_TYPE BQ_ERR_HARD_TYPE BQ_ERR_HARD_TYPE
STATUS ba00000000070f0f MCGSTATUS 4