Please help me troubleshoot MacPro Kernel Panic

I am getting a lot of Kernel Panics recently, sometimes several per day. Here is the most recent one which occured when running Pro Tools HD on my MacPr 2,1:

Interval Since Last Panic Report: 290582 sec Panics Since Last Report: 11 Anonymous UUID: E8982051-0F07-453E-8F94-F6379BC6CA63

Fri Jan 23 00:21:59 2015 Machine-check capabilities 0x0000000000000806: family: 6 model: 15 stepping: 11 microcode: 0 Intel(R) Xeon(R) CPU X5365 @ 3.00GHz 6 error-reporting banks threshold-based error status present Processor 0: no machine-check status reported Processor 1: no machine-check status reported Processor 2: no machine-check status reported Processor 3: no machine-check status reported Processor 4: machine-check status 0x0000000000000005: restart IP valid machine-check in progress MCA error-reporting registers: IA32_MC0_STATUS(0x401): 0xb200004000000800 valid MCA error code: 0x0800 Model specific error code: 0x0000 Other information: 0x00000040 Threshold-based status: Undefined Status bits: Processor context corrupt Error enabled Uncorrected error IA32_MC1_STATUS(0x405): 0x0000000000000000 invalid IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid IA32_MC3_STATUS(0x40d): 0x0020000000000000 invalid IA32_MC4_STATUS(0x411): 0x0000000000000011 invalid IA32_MC5_STATUS(0x415): 0xb200221024080400 valid MCA error code: 0x0400 Model specific error code: 0x2408 Other information: 0x00002210 Threshold-based status: Undefined Status bits: Processor context corrupt Error enabled Uncorrected error Processor 5: no machine-check status reported Processor 6: no machine-check status reported Processor 7: no machine-check status reported panic(cpu 4 caller 0xffffff80098b91b9): "Machine Check at 0xffffff7f8b0123ce, registers:\n" "CR0: 0x0000000080010033, CR2: 0x000000010fc8b000, CR3: 0x000000002e9b2000, CR4: 0x0000000000000660\n" "RAX: 0x0000000000000000, RBX: 0xffffff802a508800, RCX: 0x0000000000000001, RDX: 0x0000000000000000\n" "RSP: 0xffffff81dae3b9a0, RBP: 0xffffff81dae3b9d0, RSI: 0x0000000000000001, RDI: 0xffffff81d091d148\n" "R8: 0x1000000000000000, R9: 0x0000000000988a00, R10: 0xffffff8009ef3b00, R11: 0x0000000000000246\n" "R12: 0x0000000000000001, R13: 0xffffff802a35cac0, R14: 0x0000000000000000, R15: 0x0000000000000148\n" "RFL: 0x0000000000000046, RIP: 0xffffff7f8b0123ce, CS: 0x0000000000000008, SS: 0x0000000000000010\n" "Error code: 0x0000000000000000\n"@/SourceCache/xnu/xnu-2050.48.12/osfmk/i386/trap_native.c:280 Backtrace (CPU 4), Frame : Return Address 0xffffff81d092cec0 : 0xffffff800981d636 0xffffff81d092cf30 : 0xffffff80098b91b9 0xffffff81d092d0a0 : 0xffffff80098cf4df 0xffffff81dae3b9d0 : 0xffffff7f8b00b6d2 0xffffff81dae3bab0 : 0xffffff7f8b00aa6e 0xffffff81dae3bb60 : 0xffffff80098ba19a 0xffffff81dae3bb80 : 0xffffff800982f35d 0xffffff81dae3bbc0 : 0xffffff800982de11 0xffffff81dae3bc20 : 0xffffff800982db83 0xffffff81dae3bc60 : 0xffffff80098342f7 0xffffff81dae3bcc0 : 0xffffff7f8a6b671e 0xffffff81dae3bcf0 : 0xffffff7f8a6b69a5 0xffffff81dae3bd20 : 0xffffff8009927806 0xffffff81dae3bd70 : 0xffffff80099190e4 0xffffff81dae3bde0 : 0xffffff800990f509 0xffffff81dae3be30 : 0xffffff8009b52f83 0xffffff81dae3be60 : 0xffffff8009b7fa23 0xffffff81dae3bf60 : 0xffffff8009be94c3 0xffffff81dae3bfb0 : 0xffffff80098cf130 Kernel Extensions in backtrace: com.apple.driver.AppleIntelCPUPowerManagement(214.0)[3B20B0E5-0D48-36D9-BA2C-B6208BC6E795]@0xffffff7f8b008000->0xffffff7f8b035fff com.digidesign.iokit.DigiDal(10.3.8f123)[07139795-3C93-8119-8513-2884210177D9]@0xffffff7f8a6aa000->0xffffff7f8a6e9fff dependency: com.apple.iokit.IOPCIFamily(2.8)[6C1D646D-7E5E-3D7F-A557-2CBA398FF878]@0xffffff7f89e08000

BSD process name corresponding to current thread: Pro Tools Boot args: kext-dev-mode=1 -v

Mac OS version: 12F45

Kernel version: Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 Kernel UUID: EA38B02E-2B88-309F-BA68-1DE29F605DD8 Kernel slide: 0x0000000009600000 Kernel text base: 0xffffff8009800000 System model name: MacPro2,1 (Mac-F4208DC8)

System uptime in nanoseconds: 1461343421554 last loaded kext at 1309568223737: com.apple.filesystems.smbfs 1.8.4 (addr 0xffffff7f8b85e000, size 229376) last unloaded kext at 308132683319: com.apple.filesystems.msdosfs 1.8.1 (addr 0xffffff7f8b850000, size 57344) loaded kexts: com.paceap.kext.pacesupport.snowleopard 5.9.1 com.kensington.trackballworks.driver 1.2.0 com.digidesign.iokit.DigiDal 10.3.8f123 com.apple.filesystems.smbfs 1.8.4 com.apple.driver.AudioAUUC 1.60 com.apple.iokit.IOBluetoothSerialManager 4.1.7f4 com.apple.filesystems.autofs 3.0 com.apple.driver.AppleHDA 2.4.7fc4 com.apple.driver.AppleUpstreamUserClient 3.5.12 com.apple.iokit.IOUserEthernet 1.0.0d1 com.apple.driver.AppleMCCSControl 1.1.11 com.apple.driver.AppleMCEDriver 1.1.9 com.apple.kext.AMDFramebuffer 8.1.6 com.apple.Dont_Steal_Mac_OS_X 7.0.0 com.apple.driver.AppleLPC 1.6.3 com.apple.AMDRadeonAccelerator 1.0.8 com.apple.driver.ApplePolicyControl 3.4.5 com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0 com.apple.iokit.SCSITaskUserClient 3.5.6 com.apple.driver.XsanFilter 404 com.apple.driver.AppleUSBHub 635.4.0 com.apple.iokit.IOAHCIBlockStorage 2.3.5 com.apple.driver.AppleIntel8254XEthernet 3.1.1b1 com.apple.driver.AppleFWOHCI 4.9.9 com.apple.driver.AppleAHCIPort 2.6.6 com.apple.driver.AppleUSBEHCI 621.4.6 com.apple.driver.AppleIntelPIIXATA 2.5.1 com.apple.driver.AppleUSBUHCI 621.4.0 com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1 com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1 com.apple.BootCache 34 com.apple.driver.AppleACPIButtons 1.8 com.apple.driver.AppleHPET 1.8 com.apple.driver.AppleRTC 1.5 com.apple.driver.AppleSMBIOS 1.9 com.apple.driver.AppleACPIEC 1.8 com.apple.driver.AppleAPIC 1.7 com.apple.driver.AppleIntelCPUPowerManagementClient 214.0.0 com.apple.nke.applicationfirewall 4.0.39 com.apple.security.quarantine 2.1 com.apple.driver.AppleIntelCPUPowerManagement 214.0.0 com.apple.iokit.IOSerialFamily 10.0.6 com.apple.kext.triggers 1.0 com.apple.driver.DspFuncLib 2.4.7fc4 com.apple.iokit.IOAudioFamily 1.9.2fc7 com.apple.kext.OSvKernDSPLib 1.12 com.apple.driver.AppleSMBusController 1.0.11d1 com.apple.iokit.IOSurface 86.0.4 com.apple.iokit.IOFireWireIP 2.2.5 com.apple.iokit.IOBluetoothFamily 4.1.7f4 com.apple.driver.AppleHDAController 2.4.7fc4 com.apple.iokit.IOHDAFamily 2.4.7fc4 com.apple.iokit.IOAcceleratorFamily 74.17 com.apple.kext.AMD7000Controller 8.1.6 com.apple.kext.AMDSupport 8.1.6 com.apple.driver.AppleGraphicsControl 3.4.5 com.apple.iokit.IONDRVSupport 2.3.7 com.apple.iokit.IOGraphicsFamily 2.3.7 com.apple.driver.AppleSMC 3.1.0d5 com.apple.driver.IOPlatformPluginLegacy 1.0.0 com.apple.driver.IOPlatformPluginFamily 5.4.1d13 com.apple.driver.AppleUSBHIDKeyboard 170.2.4 com.apple.driver.AppleHIDKeyboard 170.2.4 com.apple.iokit.IOUSBHIDDriver 623.4.0 com.apple.driver.AppleUSBMergeNub 621.4.6 com.apple.driver.AppleUSBComposite 621.4.0 com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.5.6 com.apple.iokit.IOBDStorageFamily 1.7 com.apple.iokit.IODVDStorageFamily 1.7.1 com.apple.iokit.IOCDStorageFamily 1.7.1 com.apple.iokit.IOATAPIProtocolTransport 3.5.0 com.apple.iokit.IOSCSIArchitectureModelFamily 3.5.6 com.apple.iokit.IOUSBUserClient 630.4.4 com.apple.iokit.IOFireWireFamily 4.5.5 com.apple.iokit.IOAHCIFamily 2.5.1 com.apple.iokit.IOATAFamily 2.5.1 com.apple.iokit.IOUSBFamily 635.4.0 com.apple.iokit.IONetworkingFamily 3.0 com.apple.driver.AppleEFINVRAM 2.0 com.apple.iokit.IOHIDFamily 1.8.1 com.apple.driver.AppleEFIRuntime 2.0 com.apple.iokit.IOSMBusFamily 1.1 com.apple.security.sandbox 220.3 com.apple.kext.AppleMatch 1.0.0d1 com.apple.security.TMSafetyNet 7 com.apple.driver.DiskImages 345 com.apple.iokit.IOStorageFamily 1.8 com.apple.driver.AppleKeyStore 28.21 com.apple.driver.AppleACPIPlatform 1.8 com.apple.iokit.IOPCIFamily 2.8 com.apple.iokit.IOACPIFamily 1.4 com.apple.kec.corecrypto 1.0 Model: MacPro2,1, BootROM MP21.007F.B06, 8 processors, Quad-Core Intel Xeon, 3 GHz, 16 GB, SMC 1.7f10 Graphics: AMD Radeon HD 7950, AMD Radeon HD 7950, PCIe, 3072 MB Memory Module: DIMM Riser A/DIMM 1, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E00000000000000000000 Memory Module: DIMM Riser A/DIMM 2, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E00000000000000000000 Memory Module: DIMM Riser B/DIMM 1, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E00000000000000000000 Memory Module: DIMM Riser B/DIMM 2, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E00000000000000000000 Memory Module: DIMM Riser A/DIMM 3, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E20202020202020202020 Memory Module: DIMM Riser A/DIMM 4, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x4B494E4753544F4E20202020202020202020 Memory Module: DIMM Riser B/DIMM 3, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x000000000000000000000000000000000000 Memory Module: DIMM Riser B/DIMM 4, 2 GB, DDR2 FB-DIMM, 667 MHz, 0x0198, 0x000000000000000000000000000000000000 Network Service: Ethernet 1, Ethernet, en0 PCI Card: AMD Radeon HD 7950, sppci_displaycontroller, Slot-1 PCI Card: AMD Radeon HD 7950, ATY,HamachiParent, Slot-1 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@8,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@6,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@8,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@8,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@6,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@6,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@10,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@16,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@18,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@16,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@10,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@18,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@14,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@16,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@10,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@18,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@12,4,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@14,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@12,5,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@12,6,0 PCI Card: pci1057,3410, sppci_othermultimedia, Slot-4@14,6,0 Serial ATA Device: Samsung SSD 840 EVO 250GB, 250.06 GB Serial ATA Device: Hitachi HDS722020ALA330, 2 TB Serial ATA Device: WDC WD20EARX-00PASB0, 2 TB Serial ATA Device: Hitachi HDS722020ALA330, 2 TB Serial ATA Device: Samsung SSD 840 EVO 120GB, 120.03 GB Serial ATA Device: WDC WD3000HLFS-01G6U0, 300.07 GB Parallel ATA Device: _NEC DVD_RW ND-4570A USB Device: USB 2.0 Hub [MTT], 0x1a40 (TERMINUS TECHNOLOGY INC.), 0x0101, 0xfd400000 / 3 USB Device: MT4, 0x086a (Emagic Soft-und Hardware Gmbh), 0x0003, 0xfd440000 / 8 USB Device: CTH-470, 0x056a (WACOM Co., Ltd.), 0x00de, 0xfd430000 / 7 USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0xfd420000 / 6 USB Device: Kensington Expert Mouse, 0x047d (Kensington), 0x1020, 0xfd423000 / 10 USB Device: Apple Keyboard, apple_vendor_id, 0x0250, 0xfd422000 / 9 USB Device: hub_device, 0x050d (Belkin Corporation), 0x0237, 0xfd300000 / 2 USB Device: iLok, 0x088e, 0x5036, 0xfd370000 / 5 USB Device: iLok, 0x088e, 0x5036, 0xfd360000 / 4 FireWire Device: built-in_hub, 800mbit_speed

I have done MemTest and the RAM is apparently ok. My machine is an upgraded MacPro 1,1 with X5365's and a flashed AMD7950 running 10.8.5. I have an expansion chassis connected with the host card in slot 4.

Really appreciate any help with this.