What's causing my Kernel Panic

I am very new to Macs in general. I've used one for a few years at work and finally switched over my home system in May. I have a Mac Pro OSX 10.5.8, 2.66 GHz Quad Intel Xeon with 8 GB of Ram. I also have an upgraded graphics card. My software is limited to Adobe Creative Suite CS3, Neo Office, and Logic Express. Not much else.

I've looked for anything that I can discern in my panic log, but I really cannot make heads or tails of anything in here.

I've had 6 Kernel Panics since Dec 2, 09, the most recent being earlier today.

Here's the whole panic log from the most recent and I apologize in advance for posting the whole thing. I'm not sure what is relevant and what is not:

Sun Dec 27 18:48:51 2009
Machine-check capabilities (cpu 1) 0x0000000000001c09:
family: 6 model: 26 stepping: 5 microcode: 15
Intel(R) Xeon(R) CPU W3520 @ 2.67GHz
9 error-reporting banks
threshold-based error status present
extended corrected memory error handling present
Machine-check status 0x0000000000000004:
machine-check in progress
MCA error-reporting registers:
IA32_MC0_STATUS(0x401): 0x0000000000000800 invalid
IA32_MC1_STATUS(0x405): 0x0000000000000800 invalid
IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
IA32_MC4_STATUS(0x411): 0x0000000000000000 invalid
IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
IA32_MC7_STATUS(0x41d): 0x0000000000000000 invalid
Package 0 logged:
IA32_MC8_STATUS(0x421): 0xbe0000000001009f valid
Channel number: 15 (unknown)
Memory Operation: read
Machine-specific error: Read ECC
COR_ERR_CNT: 0
Status bits:
Processor context corrupt
ADDR register valid
MISC register valid
Error enabled
Uncorrected error
IA32_MC8_ADDR(0x422): 0x000000006d5bd500
IA32_MC8_MISC(0x423): 0xb848adf000081181
DIMM: 0
Channel: 2
Syndrome: 0xb848adf0
panic(cpu 0 caller 0x001AAA68): Machine Check at 0x10fb5652, thread:0xb596a78, trapno:0x12, err:0x0, registers:
CR0: 0x80010033, CR2: 0x233c5544, CR3: 0x015a6000, CR4: 0x00000668
EAX: 0x00000113, EBX: 0x00000001, ECX: 0x0001ae5c, EDX: 0x001b9eb7
ESP: 0xb102f22c, EBP: 0xb102f288, ESI: 0x202a1020, EDI: 0xb102f360
EFL: 0x00000202, EIP: 0x10fb5652

Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x4f4e28 : 0x12b4c6 (0x45f91c 0x4f4e5c 0x13355c 0x0)
0x4f4e78 : 0x1aaa68 (0x469790 0x10fb5652 0xb596a78 0x12)
0x4f4f58 : 0x1a2563 (0x4f4f70 0x0 0x0 0x0)
0xb102f288 : 0x0 (0x0 0x0 0x0 0x0)
Backtrace terminated-invalid frame pointer 0

BSD process name corresponding to current thread: Safari

Mac OS version:
9L31a

Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: MacPro4,1 (Mac-F221BEC8)

System uptime in nanoseconds: 2813963970291
unloaded kexts:
com.apple.driver.InternalModemSupport 2.4.0 - last unloaded 177646807471
loaded kexts:
com.paceap.kext.pacesupport.leopard 5.7.1
com.apple.driver.AppleHWSensor 1.9d0 - last loaded 16281188789
com.apple.filesystems.autofs 2.0.2
com.apple.driver.InternalModemSupport 2.4.0
com.apple.driver.AppleHDAPlatformDriver 1.7.1a2
com.apple.driver.AppleMikeyHIDDriver 1.0.6
com.apple.driver.AppleUpstreamUserClient 2.7.5
com.apple.driver.AppleHDAHardwareConfigDriver 1.7.1a2
com.apple.driver.AppleMikeyDriver 1.7.1a2
com.apple.driver.AppleHDA 1.7.1a2
com.apple.driver.AGPM 100.8.7
com.apple.iokit.IOBluetoothSerialManager 2.1.9f10
com.apple.Dont_Steal_Mac_OS_X 6.0.3
com.apple.driver.AppleHDAController 1.7.1a2
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.driver.ACPI_SMC_PlatformPlugin 3.4.0a17
com.apple.driver.AppleSMBusPCI 1.0.1d1
com.apple.driver.AppleLPC 1.3.1
com.apple.driver.AppleTyMCEDriver 1.0.0d28
com.apple.GeForce 5.4.8
com.apple.nvidia.nv50hal 5.4.8
com.apple.driver.AppleUSBHIDMouse 1.2.4b3
com.apple.driver.BroadcomUSBBluetoothHCIController 2.1.9f10
com.apple.driver.AppleHIDKeyboard 1.0.9b4
com.apple.driver.XsanFilter 2.7.91
com.apple.iokit.IOAHCIBlockStorage 1.2.2
com.apple.driver.AppleUSBMergeNub 3.5.2
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.1.1
com.apple.iokit.SCSITaskUserClient 2.1.1
com.apple.driver.AppleFileSystemDriver 1.1.0
com.apple.driver.AppleFWOHCI 3.9.7
com.apple.iokit.IOAHCISerialATAPI 1.1.2
com.apple.driver.AppleUSBHub 3.4.9
com.apple.driver.AirPortBrcm43xx 366.91.21
com.apple.iokit.IOUSBUserClient 3.5.2
com.apple.driver.AppleIntel8254XEthernet 2.1.2b1
com.apple.driver.Intel82574L 1.0.1b47
com.apple.driver.AppleAHCIPort 1.7.0
com.apple.driver.AppleUSBEHCI 3.4.6
com.apple.driver.AppleUSBUHCI 3.5.2
com.apple.driver.AppleEFINVRAM 1.2.0
com.apple.driver.AppleRTC 1.2.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleACPIPCI 1.2.5
com.apple.driver.AppleACPIButtons 1.2.5
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.2.5
com.apple.driver.AppleAPIC 1.4
com.apple.security.seatbelt 107.12
com.apple.nke.applicationfirewall 1.6.77
com.apple.security.TMSafetyNet 3
com.apple.driver.AppleIntelCPUPowerManagement 76.2.0
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.driver.DspFuncLib 1.7.1a2
com.apple.driver.AppleSMBusController 1.0.1d1
com.apple.iokit.IOSerialFamily 9.4
com.apple.iokit.IOHDAFamily 1.7.1a2
com.apple.iokit.IOAudioFamily 1.6.9fc5
com.apple.kext.OSvKernDSPLib 1.1
com.apple.driver.IOPlatformPluginFamily 3.4.0a17
com.apple.driver.AppleSMC 2.3.1d1
com.apple.NVDAResman 5.4.8
com.apple.iokit.IONDRVSupport 1.7.3
com.apple.iokit.IOGraphicsFamily 1.7.3
com.apple.driver.AppleHIDMouse 1.2.4b3
com.apple.driver.AppleUSBBluetoothHCIController 2.1.9f10
com.apple.iokit.IOBluetoothFamily 2.1.9f10
com.apple.iokit.IOUSBHIDDriver 3.4.6
com.apple.driver.AppleUSBComposite 3.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice 2.1.1
com.apple.iokit.IOBDStorageFamily 1.5
com.apple.iokit.IODVDStorageFamily 1.5
com.apple.iokit.IOCDStorageFamily 1.5
com.apple.iokit.IOFireWireFamily 3.4.9
com.apple.iokit.IOSCSIArchitectureModelFamily 2.1.1
com.apple.iokit.IO80211Family 216.1
com.apple.iokit.IONetworkingFamily 1.6.1
com.apple.iokit.IOAHCIFamily 1.5.0
com.apple.iokit.IOUSBFamily 3.5.2
com.apple.driver.AppleEFIRuntime 1.2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOStorageFamily 1.5.6
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.AppleACPIPlatform 1.2.5
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.2.0



Thanks much for any helpful response!

 

Thanks much! I will try this, although the first time I had a Panic I updated all software (including Safari) and it has happened since then. But I'll try it anyway.

Safari has been always at least been open when a Panic has happened for me so that makes sense - but I pretty much always have Safari open to some degree.

Downloading updates now.

 

So my Safari was totally up-to-date at the time of my most recent Kernel Panics (as I thought). What else can I do at this point?

For now I'll probably contact Apple since I'm still under warranty and use Firefox or something if I intend on doing any actual work.

 

Could you please elaborate on what steps to take to do this? I don't feel comfortable doing this unguided. I also don't really no where to begin.

Thanks!