found on console when crashed (and burned) on 20140218..
{{{

<Feb/15 03:43 pm>[1570399.930003] Disabling lock debugging due to kernel taint
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: CPU 7: Machine Check Exception: 0 Bank 3: 9020000d0004010a
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: TSC 0 
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: PROCESSOR 0:10676 TIME 1392352531 SOCKET 1 APIC 7 microcode 60b
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: Run the above through 'mcelog --ascii'
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: CPU 5: Machine Check Exception: 5 Bank 5: b200000806000e0f
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: RIP !INEXACT! 33:<00007f2232744385> 
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: TSC 11cf0937d9a020 
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: PROCESSOR 0:10676 TIME 1392515029 SOCKET 1 APIC 6 microcode 60b
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: Run the above through 'mcelog --ascii'
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: Some CPUs didn't answer in synchronization
<Feb/15 03:43 pm>[1570399.930002] mce: [Hardware Error]: Machine check: Processor context corrupt
<Feb/15 03:43 pm>[1570399.930002] Kernel panic - not syncing: Fatal machine check on current CPU
<Feb/15 03:44 pm>[1570399.930002] Rebooting in 30 seconds..
eb/15 03:45 pm>;1HPress <F2> to enter SETUP                                                       6 Phoenix Technologies Ltd.                                   
All Rights Reserved                                                             
                                                                                
TYAN Tempest i5400PW S5397 BIOS V1.02                                           
CPU = 2 Processors Detected, Cores per Processor = 4                            
Intel(R) Xeon(R) CPU           X5482  @ 3.20GHz                                 
Intel(R) Xeon(R) CPU           X5482  @ 3.20GHz                                 
16384M System RAM Passed  Memory Frequency For DDR2 800                         
12288 KB L2 Cache                                                               
System BIOS shadowed                                                            
Video BIOS shadowedFeb/15 03:44 pm>                                             ATAPI CD-ROM: Optiarc DVD RW AD-7590A                                  
...
}}}