Kernel Panic help

Hey, just hoping to get some help with what this panic means. The most recent log is below. I've tried a lot of things so far and nothing has helped. Disconnecting all but essential peripherals. Checking the ram with rember (all good). Running almost no applications.... But she's still a mess. I just get the random Grey Screen of death telling me she needs a restart. And its very random when she dies. Sometimes after a minute, sometimes an hour, or a day. But more than likely its averaging every 30 minutes. (Thanks)

Interval Since Last Panic Report: 50894 sec
Panics Since Last Report: 8
Anonymous UUID: A18F0D1D-5F37-4650-886D-8792F7C9C6A6

Tue Apr 12 13:12:32 2011
Machine-check capabilities (cpu 5) 0x0000000000000806:
family: 6 model: 15 stepping: 11 microcode: 180
Intel(R) Xeon(R) CPU X5365 @ 3.00GHz
6 error-reporting banks
threshold-based error status present
Machine-check status 0x0000000000000005:
restart IP valid
machine-check in progress
MCA error-reporting registers:
IA32 MC0STATUS(0x401): 0x1000000020000000 invalid
IA32 MC1STATUS(0x405): 0x0000000000000000 invalid
IA32 MC2STATUS(0x409): 0x0000000000000000 invalid
IA32 MC3STATUS(0x40d): 0x0020000000000000 invalid
IA32 MC4STATUS(0x411): 0x0000000000000011 invalid
IA32 MC5STATUS(0x415): 0xb200001080200e0f valid
MCA error code: 0x0e0f
Model specific error code: 0x8020
Other information: 0x00000010
Threshold-based status: No tracking
Status bits:
Processor context corrupt
Error enabled
Uncorrected error
panic(cpu 5 caller 0x2a9d27): Machine Check at 0x5655958d, thread:0x7f35000, trapno:0x12, err:0x0,registers:
CR0: 0x8001003b, CR2: 0x002fc000, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x0797de40, ECX: 0x00000001, EDX: 0x00000000
ESP: 0x5f59bc10, EBP: 0x5f59bc48, ESI: 0x07c32800, EDI: 0x56564388
EFL: 0x00000006, EIP: 0x5655958d

Backtrace (CPU 5), Frame : Return Address (4 potential args on stack)
0x5665bfb8 : 0x21b510 (0x5d9514 0x5665bfec 0x223978 0x0)
0x5665c008 : 0x2a9d27 (0x59abb4 0x59aca1 0x5655958d 0x7f35000)
0x5665c0f8 : 0x2a1922 (0x1 0x0 0x0 0x0)
0x5f59bc48 : 0x5654efc0 (0x564ad0a4 0x1 0x7c32800 0x0)
0x5f59bd38 : 0x5655051c (0x56ee623a 0x800001b3 0x0 0x0)
0x5f59bdf8 : 0x2abb44 (0xffffffff 0x7fffffff 0x10 0x202)
0x5f59be18 : 0x225851 (0x0 0x56d1868e 0x1b3 0x564e6488)
0x5f59be78 : 0x226623 (0x1 0x7f35000 0x7d790dc 0x210b24)
0x5f59bee8 : 0x227247 (0x7f3501c 0x0 0x0 0x29f562)
0x5f59bf58 : 0x2272c8 (0x22fc24 0x863ea0 0x0 0x2a358d)
0x5f59bf78 : 0x22fdbe (0x22fc24 0x863ea0 0x0 0x0)
0x5f59bfc8 : 0x2a06dc (0x863ea0 0x0 0x10 0x85112e4)
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AppleIntelCPUPowerManagement(105.13.0)@0x5654d000->0x5656afff

BSD process name corresponding to current thread: kernel_task

Mac OS version:
10J869

Kernel version:
Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386
System model name: MacPro2,1 (Mac-F4208DA9)

System uptime in nanoseconds: 1869769937487
unloaded kexts:
com.apple.driver.AppleFileSystemDriver 2.0 (addr 0x5f7c9000, size 0x12288) - last unloaded 198462936790
loaded kexts:
com.AmbrosiaSW.AudioSupport 3.2
com.Logitech.Control Center.HID Driver 3.3.0
com.apple.driver.AppleHWSensor 1.9.3d0 - last loaded 44608941680
com.apple.filesystems.autofs 2.1.0
com.apple.Dont Steal_Mac_OSX 7.0.0
com.apple.iokit.CHUDUtils 364
com.apple.driver.AppleUpstreamUserClient 3.5.4
com.apple.iokit.CHUDProf 364
com.apple.driver.AppleMCCSControl 1.0.17
com.apple.GeForce 6.2.6
com.apple.driver.AudioAUUC 1.54
com.apple.driver.AudioIPCDriver 1.1.6
com.apple.driver.AppleHDA 1.9.9f12
com.apple.driver.AppleIntel8254XEthernet 2.1.1b7
com.apple.driver.AppleUSBDisplays 283
com.apple.driver.AppleIntelMeromProfile 26
com.apple.driver.AppleMCEDriver 1.1.9
com.apple.driver.AirPortBrcm43224 427.36.9
com.apple.driver.ACPI SMCPlatformPlugin 4.5.0d5
com.apple.driver.AppleLPC 1.4.12
com.apple.iokit.SCSITaskUserClient 2.6.5
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.iokit.IOAHCIBlockStorage 1.6.3
com.apple.driver.AppleUSBHub 4.1.7
com.apple.driver.AppleAHCIPort 2.1.5
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleEFINVRAM 1.4.0
com.apple.driver.AppleUSBEHCI 4.1.8
com.apple.driver.AppleUSBUHCI 4.1.5
com.apple.driver.AppleACPIButtons 1.3.5
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleSMBIOS 1.6
com.apple.driver.AppleACPIEC 1.3.5
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 105.13.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.11
com.apple.driver.AppleIntelCPUPowerManagement 105.13.0
com.apple.driver.AppleProfileReadCounterAction 67
com.apple.driver.AppleProfileTimestampAction 67
com.apple.driver.AppleProfileThreadInfoAction 67
com.apple.driver.AppleProfileRegisterStateAction 67
com.apple.driver.AppleProfileKEventAction 67
com.apple.driver.AppleProfileCallstackAction 69
com.apple.iokit.IOSurface 74.2
com.apple.iokit.IOBluetoothSerialManager 2.4.0f1
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.iokit.CHUDKernLib 365
com.apple.driver.DspFuncLib 1.9.9f12
com.apple.nvidia.nv40hal 6.2.6
com.apple.NVDAResman 6.2.6
com.apple.iokit.IONDRVSupport 2.2
com.apple.driver.AppleUSBAudio 2.7.6f4
com.apple.iokit.AppleProfileFamily 61
com.apple.driver.AppleHDAController 1.9.9f12
com.apple.iokit.IOGraphicsFamily 2.2
com.apple.iokit.IOHDAFamily 1.9.9f12
com.apple.iokit.IOAudioFamily 1.8.0fc1
com.apple.kext.OSvKernDSPLib 1.3
com.apple.iokit.IO80211Family 314.1.1
com.apple.iokit.IONetworkingFamily 1.10
com.apple.driver.AppleSMC 3.1.0d3
com.apple.driver.IOPlatformPluginFamily 4.5.0d5
com.apple.driver.CSRUSBBluetoothHCIController 2.4.0f1
com.apple.driver.AppleUSBBluetoothHCIController 2.4.0f1
com.apple.iokit.IOBluetoothFamily 2.4.0f1
com.apple.driver.AppleUSBMergeNub 4.1.8
com.apple.iokit.IOUSBHIDDriver 4.1.5
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.5
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOATAPIProtocolTransport 2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.5
com.apple.iokit.IOUSBUserClient 4.1.5
com.apple.iokit.IOAHCIFamily 2.0.4
com.apple.iokit.IOATAFamily 2.5.1
com.apple.iokit.IOUSBFamily 4.1.8
com.apple.driver.AppleEFIRuntime 1.4.0
com.apple.iokit.IOHIDFamily 1.6.5
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.TMSafetyNet 6
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 289
com.apple.iokit.IOStorageFamily 1.6.2
com.apple.driver.AppleACPIPlatform 1.3.5
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0
Model: MacPro2,1, BootROM MP21.007F.B08, 8 processors, Quad-Core Intel Xeon, 3 GHz, 4 GB, SMC 1.15f3
Graphics: NVIDIA GeForce 7300 GT, NVIDIA GeForce 7300 GT, PCIe, 256 MB
Memory Module: global_name
AirPort: spairport wireless_card_type_airportextreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.131.36.9)
Bluetooth: Version 2.4.0f1, 2 service, 19 devices, 0 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
PCI Card: NVIDIA GeForce 7300 GT, Display, Slot-1
Serial ATA Device: ST3750640AS P, 698.64 GB
Serial ATA Device: ST3750640AS P, 698.64 GB
Parallel ATA Device: PIONEER DVD-RW DVR-112D
USB Device: Hub, 0x05ac (Apple Inc.), 0x912f, 0xfd300000
USB Device: USB-PS/2 Mouse M-BA47, 0x046d (Logitech Inc.), 0xc002, 0xfd310000
USB Device: Hub in Apple Pro Keyboard, 0x05ac (Apple Inc.), 0x1003, 0xfd330000
USB Device: Apple Pro Keyboard, 0x05ac (Apple Inc.), 0x020b, 0xfd333000
USB Device: Apple Cinema HD Display, 0x05ac (Apple Inc.), 0x9221, 0xfd320000
USB Device: Blue Snowball, 0x074d, 0x0005, 0x1d100000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8206, 0x5d200000