"TLB parity error in virtual array; TLB error 'instruction"?

Hello.

Lately, I have been random and rare kernel panics on my old Debian/Linux
box (tried both Kernel versions 2.6.30 and 2.6.32). I couldn't figure
out what it was until I discovered mcelog a couple days ago, and it
revealed interesting scary datas in my dmesg/messages and syslog:

# cat /var/log/messages
....
Mar 7 08:25:24 MyLinuxBox kernel: [ 3299.988026] Machine check events
logged
Mar 7 08:25:24 MyLinuxBox mcelog: HARDWARE ERROR. This is *NOT* a
software problem!
Mar 7 08:25:24 MyLinuxBox mcelog: Please contact your hardware vendor
Mar 7 08:25:24 MyLinuxBox mcelog: MCE 0
Mar 7 08:25:24 MyLinuxBox mcelog: CPU 1 1 instruction cache
Mar 7 08:25:24 MyLinuxBox mcelog: ADDR c11b6ff0
Mar 7 08:25:24 MyLinuxBox mcelog: TIME 1267979124 Sun Mar 7 08:25:24 2010
Mar 7 08:25:24 MyLinuxBox mcelog: TLB parity error in virtual array
Mar 7 08:25:24 MyLinuxBox mcelog: TLB error 'instruction transaction,
level 1'
Mar 7 08:25:24 MyLinuxBox mcelog: STATUS 9400000000010011 MCGSTATUS 0
Mar 7 08:25:24 MyLinuxBox mcelog: MCGCAP 105 APICID 1 SOCKETID 0
Mar 7 08:25:24 MyLinuxBox mcelog: CPUID Vendor AMD Family 15 Model 43

I am not familiar with hardwares, so I assume this is very bad, but what
part(s) is/are bad? Is my old Athlon 64 X2 CPU dying/damaged? I have had
it and its motherboard since 12/24/2006, so it is not that old yet. I
have the full details on my secondary machine at
http://alpha.zimage.com/~ant/antfarm.../computers.txt ...

Although, this might be related to the PSU's death back in early
December 2009. My friend and I believe it also took out my EVGA GeForce
8800 GT video card and damage a 512 MB of RAM (tested 3 GB with and each
piece with memtest86+ v4.00 to narrow it down).
http://alpha.zimage.com/~ant/antfarm/about/toys.html has a log of the
details of my systems. I did run memtest86+ again a couple weeks ago and
this morning for 5-6 hours, but not got no errors after five full tests
(passed). I also do not overclock/OC.

Thank you in advance.
--
"Ever watch ants just crawling around? They walk in that single straight
line, a long, a long, long mile of ants. Sometimes they will walk over
and pick up their dead friends and carry those around. I'm pretty sure
it's because they can get in the carpool lane and pass up that line."
--Ellen DeGeneres
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