2 random shutdowns in one session

here is the report. I'm not expert enough to translate. any help appreciated. thnx.

Interval Since Last Panic Report: 8334337 sec

Panics Since Last Report: 2

Anonymous UUID: FAA4A424-F9C9-45EB-63EB-C5B36D5A654C

Tue Mar 4 18:43:34 2014

panic(cpu 5 caller 0xffffff801be9e54b): "TLB invalidation IPI timeout: " "CPU(s) failed to respond to interrupts, unresponsive CPU bitmap: 0x42, NMIPI acks: orig: 0x0, now: 0x0"@/SourceCache/xnu/xnu-2050.48.12/osfmk/x86_64/pmap.c:2343

Backtrace (CPU 5), Frame : Return Address

0xffffff825eabaf50 : 0xffffff801be1d636

0xffffff825eabafc0 : 0xffffff801be9e54b

0xffffff825eabb040 : 0xffffff801bea2d60

0xffffff825eabb100 : 0xffffff801bea3595

0xffffff825eabb150 : 0xffffff801be6722c

0xffffff825eabb240 : 0xffffff801be6b100

0xffffff825eabb270 : 0xffffff801c25e369

0xffffff825eabb290 : 0xffffff801c25e465

0xffffff825eabb2b0 : 0xffffff801c25e43e

0xffffff825eabb2d0 : 0xffffff7f9d4f839d

0xffffff825eabb700 : 0xffffff7f9d4a8c80

0xffffff825eabb730 : 0xffffff7f9d4fc1dd

0xffffff825eabb7b0 : 0xffffff7f9d4e3460

0xffffff825eabb810 : 0xffffff7f9d4e3d41

0xffffff825eabb860 : 0xffffff7f9d4e4294

0xffffff825eabb8d0 : 0xffffff7f9d4e4a53

0xffffff825eabb910 : 0xffffff7f9d4afedf

0xffffff825eabba90 : 0xffffff7f9d4e0f8f

0xffffff825eabbb50 : 0xffffff7f9d4ae978

0xffffff825eabbba0 : 0xffffff801c26f789

0xffffff825eabbbc0 : 0xffffff801c270d30

0xffffff825eabbc20 : 0xffffff801c26e74f

0xffffff825eabbd70 : 0xffffff801be98c21

0xffffff825eabbe80 : 0xffffff801be20b4d

0xffffff825eabbeb0 : 0xffffff801be10448

0xffffff825eabbf00 : 0xffffff801be1961b

0xffffff825eabbf70 : 0xffffff801bea6546

0xffffff825eabbfb0 : 0xffffff801becf473

Kernel Extensions in backtrace:

com.apple.GeForce(8.1.6)[7C67749B-3B6B-38A9-8203-01A139C21895]@0xffffff7f9d49c0 00->0xffffff7f9d569fff

dependency: com.apple.NVDAResman(8.1.6)[EA4F9902-5AAE-3F1D-A846-3796221C8C91]@0xffffff7f9c5 94000

dependency: com.apple.iokit.IONDRVSupport(2.3.7)[F16E015E-1ABE-3C40-AC71-BC54F4BE442E]@0xff ffff7f9c580000

dependency: com.apple.iokit.IOPCIFamily(2.8)[6C1D646D-7E5E-3D7F-A557-2CBA398FF878]@0xffffff 7f9c435000

dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[9928306E-3508-3DBC-80A4-D8F1D87650D7]@0 xffffff7f9c53d000

BSD process name corresponding to current thread: WindowServer

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: 0x000000001bc00000

Kernel text base: 0xffffff801be00000

System model name: MacPro3,1 (Mac-F42C88C8)

System uptime in nanoseconds: 4861677893873

last loaded kext at 52911113880: com.apple.driver.AppleHWSensor 1.9.5d0 (addr 0xffffff7f9df47000, size 36864)

last unloaded kext at 130607870760: com.apple.driver.AppleFileSystemDriver 3.0.1 (addr 0xffffff7f9e169000, size 8192)

loaded kexts:

com.AmbrosiaSW.AudioSupport 4.1.2

com.Logitech.Control Center.HID Driver 3.7.0

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.iokit.IOBluetoothSerialManager 4.1.7f4

com.apple.driver.AudioAUUC 1.60

com.apple.driver.AppleUpstreamUserClient 3.5.12

com.apple.driver.AppleMCCSControl 1.1.11

com.apple.kext.AMDFramebuffer 8.1.6

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.GeForce 8.1.6

com.apple.filesystems.autofs 3.0

com.apple.AMDRadeonAccelerator 1.0.8

com.apple.driver.AppleUSBDisplays 357

com.apple.driver.AppleHDA 2.4.7fc4

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleMCEDriver 1.1.9

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.iokit.CSRBluetoothHostControllerUSBTransport 4.1.7f4

com.apple.driver.ApplePolicyControl 3.4.5

com.apple.driver.AppleLPC 1.6.3

com.apple.driver.AppleRAID 4.0.6

com.apple.driver.Oxford_Semi 3.3.1

com.apple.iokit.SCSITaskUserClient 3.5.6

com.apple.driver.XsanFilter 404

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 34

com.apple.iokit.IOAHCIBlockStorage 2.3.5

com.apple.driver.AppleUSBHub 635.4.0

com.apple.driver.AppleIntel8254XEthernet 3.1.1b1

com.apple.driver.AppleFWOHCI 4.9.9

com.apple.driver.AirPortBrcm43224 600.36.17

com.apple.driver.AppleAHCIPort 2.6.6

com.apple.driver.AppleIntelPIIXATA 2.5.1

com.apple.driver.AppleUSBEHCI 621.4.6

com.apple.driver.AppleUSBUHCI 621.4.0

Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 2.8 GHz, 20 GB, SMC 1.25f4

Graphics: ATI Radeon HD 5770, ATI Radeon HD 5770, PCIe, 1024 MB

Graphics: NVIDIA GeForce GT 120, NVIDIA GeForce GT 120, PCIe, 512 MB

Memory Module: DIMM Riser B/DIMM 1, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x02BA, 0x202020202020202020202020202020202020

Memory Module: DIMM Riser B/DIMM 2, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x02BA, 0x202020202020202020202020202020202020

Memory Module: DIMM Riser A/DIMM 1, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x02BA, 0x202020202020202020202020202020202020

Memory Module: DIMM Riser A/DIMM 2, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x02BA, 0x202020202020202020202020202020202020

Memory Module: DIMM Riser B/DIMM 3, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser B/DIMM 4, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser A/DIMM 3, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

Memory Module: DIMM Riser A/DIMM 4, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.131.36.16)

Bluetooth: Version 4.1.7f4 12974, 3 service, 20 devices, 3 incoming serial ports

Network Service: Ethernet 2, Ethernet, en1

Network Service: Wi-Fi, AirPort, en2

PCI Card: ATI Radeon HD 5770, sppci_displaycontroller, Slot-1

PCI Card: ATI Radeon HD 5770, ATY,HoolockParent, Slot-1

PCI Card: NVIDIA GeForce GT 120, sppci_displaycontroller, Slot-2

PCI Card: pci1b21,612, sppci_ahci, Slot-3

PCI Card: pci104c,823f, sppci_ieee1394openhci, Slot-4@6,0,0

Serial ATA Device: WDC WD1002FAEX-00Z3A0, 1 TB

Serial ATA Device: ST31500541AS, 1.5 TB

Serial ATA Device: ST31500541AS, 1.5 TB

Serial ATA Device: PIONEER BD-RW BDR-209D

Parallel ATA Device: PIONEER DVD-RW DVR-112D

USB Device: hub_device, 0x2001 (D-Link Corporation), 0xf103, 0xfd500000 / 4

USB Device: USB Receiver, 0x046d (Logitech Inc.), 0xc521, 0xfd540000 / 13

USB Device: EPSON Scanner, 0x04b8 (Seiko Epson Corp.), 0x012c, 0xfd520000 / 12

USB Device: USB Receiver, 0x046d (Logitech Inc.), 0xc529, 0xfd570000 / 11

USB Device: Mass Storage Device, 0x058f (Alcor Micro, Corp.), 0x6361, 0xfd560000 / 10

USB Device: Back-UPS RS 1500G FW:865.L5 .D USB FW:L5, 0x051d (American Power Conversion), 0x0002, 0xfd530000 / 9

USB Device: hub_device, apple_vendor_id, 0x911f, 0xfd400000 / 3

USB Device: MTE-450, 0x056a (WACOM Co., Ltd.), 0x0065, 0xfd410000 / 8

USB Device: Logitech Camera, 0x046d (Logitech Inc.), 0x0991, 0xfd420000 / 7

USB Device: Apple Cinema HD Display, apple_vendor_id, 0x921e, 0xfd430000 / 6

USB Device: hub_device, apple_vendor_id, 0x911c, 0xfd300000 / 2

USB Device: Apple Cinema HD Display, apple_vendor_id, 0x921c, 0xfd320000 / 5

USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8206, 0x5d200000 / 2

FireWire Device: Rugged FW/USB, LaCie, 800mbit_speed

FireWire Device: built-in_hub, 800mbit_speed

FireWire Device: unknown_device, unknown_speed