So far, we were unable to reproduce the BSOD.
Has OS X crashed with a panic log? If so can you post crash stack here?
One thing I'd try is to simplify memory setup of your Mac Pro. You have a wide variety modules installed. It's possible that some of them don't play well together and break under load.
Here is the Kernel panic log:
Fri Apr 12 09:08:29 2013
panic(cpu 6 caller 0xffffff80148b7e95): Kernel trap at 0xffffff8014843e53, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x0000000327597000, CR3: 0x0000000065f94000, CR4: 0x0000000000000660
RAX: 0x0000000000000001, RBX: 0x00000000000000b3, RCX: 0x0000000000000000, RDX: 0xffffff7f966c6460
RSP: 0xffffff821f28b8c0, RBP: 0xffffff821f28b940, RSI: 0x000000002c977ae8, RDI: 0x0000000000000001
R8: 0x0000000000000006, R9: 0x0000000000000000, R10: 0x0000000000000000, R11: 0x0000000000000000
R12: 0xffffff803c2cfaa0, R13: 0x0000000000000000, R14: 0xffffff8014eba570, R15: 0x0004000000000000
RFL: 0x0000000000010297, RIP: 0xffffff8014843e53, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000327597000, Error code: 0x0000000000000000, Fault CPU: 0x6
Backtrace (CPU 6), Frame : Return Address
0xffffff821f28b560 : 0xffffff801481d626
0xffffff821f28b5d0 : 0xffffff80148b7e95
0xffffff821f28b7a0 : 0xffffff80148cd4dd
0xffffff821f28b7c0 : 0xffffff8014843e53
0xffffff821f28b940 : 0xffffff80148438cb
0xffffff821f28ba20 : 0xffffff80148245ed
0xffffff821f28ba50 : 0xffffff8014beecc4
0xffffff821f28ba70 : 0xffffff8014beed45
0xffffff821f28ba90 : 0xffffff8014c544cd
0xffffff821f28baf0 : 0xffffff8014c541b6
0xffffff821f28bb50 : 0xffffff7f95f3de2a
0xffffff821f28bba0 : 0xffffff8014c650c9
0xffffff821f28bbc0 : 0xffffff8014c66670
0xffffff821f28bc20 : 0xffffff8014c6408f
0xffffff821f28bd70 : 0xffffff80148984a1
0xffffff821f28be80 : 0xffffff8014820aed
0xffffff821f28beb0 : 0xffffff8014810448
0xffffff821f28bf00 : 0xffffff801481961b
0xffffff821f28bf70 : 0xffffff80148a5dd6
0xffffff821f28bfb0 : 0xffffff80148cdd43
Kernel Extensions in backtrace:
com.apple.GeForce(8.1)[A15BB65E-3501-340F-87CB-2FD2BAD33E35]@0xffffff7f95f2c000->0xffffff7f95ff8fff
dependency: com.apple.NVDAResman(8.1.0)[A26D2A3D-C06F-3A0F-BCFF-901A98C93C3D]@0xffffff7f94ed9000
dependency: com.apple.iokit.IONDRVSupport(2.3.7)[38C214C0-83C8-3594-8A4C-DC6AC3FEC163]@0xffffff7f94ec5000
dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffffff7f94e44000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[74E3E50F-E50A-3073-8C96-06F854292A91]@0xffffff7f94e82000
BSD process name corresponding to current thread: prl_vm_app
Mac OS version:
12D78
Kernel version:
Darwin Kernel Version 12.3.0: Sun Jan 6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64
Kernel UUID: 3EB7D8A7-C2D3-32EC-80F4-AB37D61492C6
Kernel slide: 0x0000000014600000
Kernel text base: 0xffffff8014800000
System model name: MacPro3,1 (Mac-F42C88C8)
System uptime in nanoseconds: 10256261525058
last loaded kext at 5506301583559: com.parallels.kext.vnic 8.0 18483.860857 (addr 0xffffff7f969b7000, size 20480)
last unloaded kext at 2629282624557: com.parallels.kext.hypervisor 8.0 18483.860857 (addr 0xffffff7f969a0000, size 290816)
loaded kexts:
com.parallels.kext.vnic 8.0 18483.860857
com.parallels.kext.netbridge 8.0 18483.860857
com.parallels.kext.hidhook 8.0 18483.860857
com.parallels.kext.hypervisor 8.0 18483.860857
com.parallels.kext.usbconnect 8.0 18483.860857
com.apple.filesystems.smbfs 1.8
com.apple.driver.AudioAUUC 1.60
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.filesystems.autofs 3.0
com.apple.iokit.IOBluetoothSerialManager 4.1.3f3
com.apple.iokit.CSRBluetoothHCIControllerUSBTransport 4.1.3f3
com.apple.driver.AppleUpstreamUserClient 3.5.10
com.apple.driver.AppleHDA 2.3.7fc4
com.apple.driver.AppleMCCSControl 1.1.11
com.apple.GeForce 8.1.0
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleLPC 1.6.0
com.apple.driver.AppleMCEDriver 1.1.9
com.apple.driver.ApplePolicyControl 3.3.0
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.iokit.SCSITaskUserClient 3.5.5
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.3.1
com.apple.driver.AppleUSBHub 5.5.5
com.apple.driver.AppleIntel8254XEthernet 3.1.1b1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleFWOHCI 4.9.6
com.apple.driver.AirPortBrcm43224 600.36.17
com.apple.BootCache 34
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleUSBEHCI 5.5.0
com.apple.driver.AppleUSBUHCI 5.2.5
com.apple.driver.AppleAHCIPort 2.5.1
com.apple.driver.AppleEFINVRAM 1.7
com.apple.driver.AppleACPIButtons 1.7
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleRTC 1.5
com.apple.driver.AppleSMBIOS 1.9
com.apple.driver.AppleACPIEC 1.7
com.apple.driver.AppleAPIC 1.6
com.apple.driver.AppleIntelCPUPowerManagementClient 196.0.0
com.apple.nke.applicationfirewall 4.0.39
com.apple.security.quarantine 2
com.apple.driver.AppleIntelCPUPowerManagement 196.0.0
com.apple.iokit.IOAHCISerialATAPI 2.5.1
com.apple.kext.triggers 1.0
com.apple.driver.AppleBluetoothHIDKeyboard 170.2
com.apple.driver.IOBluetoothHIDDriver 4.1.3f3
com.apple.driver.AppleHIDKeyboard 170.2
com.apple.iokit.IOSerialFamily 10.0.6
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport 4.1.3f3
com.apple.iokit.IOUSBHIDDriver 5.2.5
com.apple.driver.DspFuncLib 2.3.7fc4
com.apple.iokit.IOAudioFamily 1.8.9fc11
com.apple.kext.OSvKernDSPLib 1.6
com.apple.driver.AppleSMBusController 1.0.11d0
com.apple.nvidia.nv50hal 8.1.0
com.apple.NVDAResman 8.1.0
com.apple.iokit.IOSurface 86.0.4
com.apple.iokit.IOBluetoothFamily 4.1.3f3
com.apple.iokit.IOFireWireIP 2.2.5
com.apple.driver.AppleHDAController 2.3.7fc4
com.apple.iokit.IOHDAFamily 2.3.7fc4
com.apple.driver.AppleGraphicsControl 3.3.0
com.apple.iokit.IONDRVSupport 2.3.7
com.apple.iokit.IOGraphicsFamily 2.3.7
com.apple.driver.AppleSMC 3.1.4d2
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.driver.IOPlatformPluginFamily 5.3.0d51
com.apple.driver.AppleUSBComposite 5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.5.5
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 3.5.5
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IO80211Family 522.4
com.apple.iokit.IOUSBUserClient 5.5.5
com.apple.iokit.IOATAFamily 2.5.1
com.apple.iokit.IONetworkingFamily 3.0
com.apple.iokit.IOUSBFamily 5.5.5
com.apple.iokit.IOAHCIFamily 2.3.1
com.apple.iokit.IOHIDFamily 1.8.1
com.apple.driver.AppleEFIRuntime 1.7
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 220.2
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 1.7
com.apple.iokit.IOPCIFamily 2.7.3
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
Dr G