AMD64 Northbridge errors

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Running RHEL 3.0 x86_64 U6 (2.4.21-37.Elsmp)

I have searched, logged a call with HP and Redhat support and have
turned up nothing.  HP says I have memory problems, Redhat says it's a
known non-critical error.  

I am not sure if I am chasing after the correct problem but all six of
my AMD64 HP XW9300 (based off Tyan Thunder K8WE?) with anywhere between
4-16Gb RAM and two Opteron CPU's get the following errors :

Nov 10 17:18:46 node4 kernel: CPU 0: Silent Northbridge MCE
Nov 10 17:18:46 node4 kernel: Northbridge status 94044100:ac080a13
Nov 10 17:18:46 node4 kernel:     Error chipkill ecc error
Nov 10 17:18:46 node4 kernel:     ECC error syndrome ac08
Nov 10 17:18:46 node4 kernel:     bus error local node response, request
didn't time out
Nov 10 17:18:46 node4 kernel:     generic read
Nov 10 17:18:46 node4 kernel:     memory access, level generic
Nov 10 17:18:46 node4 kernel:     link number 0
Nov 10 17:18:46 node4 kernel:     dram scrub error
Nov 10 17:18:46 node4 kernel:     corrected ecc error
Nov 10 17:18:46 node4 kernel:     previous error lost
Nov 10 17:18:46 node4 kernel:     NB error address 000000000126dd40
 
 
Nov 14 19:14:16 node4 kernel: CPU 0: Silent Northbridge MCE
Nov 14 19:14:16 node4 kernel: Northbridge status a6000001:0005001b
Nov 14 19:14:16 node4 kernel:     Error gart error
Nov 14 19:14:16 node4 kernel:     GART TLB error generic level generic
Nov 14 19:14:16 node4 kernel:     err cpu1
Nov 14 19:14:16 node4 kernel:     processor context corrupt
Nov 14 19:14:16 node4 kernel:     error uncorrected
Nov 14 19:14:16 node4 kernel:     previous error lost
Nov 14 19:14:16 node4 kernel:     NB error address 00000000dffe0038

Five of the computers have between 1-30 references to these error
messages in the past 3 weeks.  One computer has over 30,000 instances of
these error messages.  I am getting the majority of these messages on
computers with >4Gb RAM but I have had the messages on computers with
only 4GB RAM. 

The main reason I am focusing on these messages is that the computers
have crashed numerous times since being put online.  The computer with
30K instances of the error message has crashed about 1-2 times per week.
I am running the latest BIOS.

I can not turn on diskdump since they have Nvidia SATA controllers (not
support by diskdump) and netdump has not produced anything since during
the kernel crash no data was written ( network driver went down? ).

Has anyone else seen these messages or have any idea how to identify the
problem?  Could my crashes be due to Northbridge errors or am I barking
up the wrong tree.

Marcelino

Reference Information below

lspci information
-----------------

 00:00.0 Memory controller: nVidia Corporation CK804 Memory Controller
(rev a3)
00:01.0 ISA bridge: nVidia Corporation CK804 ISA Bridge (rev a3)
00:01.1 SMBus: nVidia Corporation CK804 SMBus (rev a2)
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97
Audio Controller (rev a2)
00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller
(rev f3)
00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA Controller
(rev f3)
00:09.0 PCI bridge: nVidia Corporation CK804 PCI Bridge (rev a2)
00:0a.0 Ethernet controller: nVidia Corporation CK804 Ethernet
Controller (rev a3)
00:0e.0 PCI bridge: nVidia Corporation CK804 PCIE Bridge (rev a3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
00:19.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
HyperTransport Technology Configuration
00:19.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Address Map
00:19.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
DRAM Controller
00:19.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron]
Miscellaneous Control
05:05.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A
IEEE-1394a-2000 Controller (PHY/Link)
0a:00.0 VGA compatible controller: nVidia Corporation NV41GL [Quadro FX
1400] (rev a2)
40:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge
(rev 12)
40:01.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01)
40:02.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge
(rev 12)
40:02.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01)
61:06.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X
Fusion-MPT Dual Ultra320 SCSI (rev 07)
61:06.1 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X
Fusion-MPT Dual Ultra320 SCSI (rev 07)
61:09.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5782
Gigabit Ethernet (rev 03)
80:00.0 Memory controller: nVidia Corporation CK804 Memory Controller
(rev a3)
80:01.0 Memory controller: nVidia Corporation CK804 Memory Controller
(rev a3)

lsmod
-----
Module                  Size  Used by    Tainted: P  
nfs                    95984   7  (autoclean)
audit                 127208   2  (autoclean)
nfsd                   86096   8  (autoclean)
lockd                  60528   1  (autoclean) [nfs nfsd]
sunrpc                 91944   1  (autoclean) [nfs nfsd lockd]
netconsole             19208   0  (unused)
autofs4                16912   2  (autoclean)
tg3                    69936   1 
nvnet                  71168   1 
sg                     37880   0  (autoclean)
sr_mod                 17676   0  (autoclean)
ide-scsi               12832   0 
ide-cd                 34408   0 
cdrom                  33096   0  [sr_mod ide-cd]
keybdev                 3104   0  (unused)
mousedev                6728   0  (unused)
hid                    21992   0  (unused)
input                   7520   0  [keybdev mousedev hid]
ehci-hcd               21200   0  (unused)
usb-ohci               22864   0  (unused)
usbcore                85152   1  [hid ehci-hcd usb-ohci]
ext3                   87856   2 
jbd                    57088   2  [ext3]
raid0                   4368   1 
sata_nv                 5116   5 
libata                 49352   0  [sata_nv]
mptscsih               43792   0  (unused)
mptbase                50472   3  [mptscsih]
diskdumplib             6548   0  [mptscsih mptbase]
sd_mod                 14964  10 
scsi_mod              130124   6  [sg sr_mod ide-scsi sata_nv libata
mptscsih sd_mod]

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