Mac Pro 3,1 Shuts Down Unexpectedly

My computer lately shuts down unexpectedly. It's not an overheat problem.
When I use skype, as soon as the video conversation starts, it shuts down.
When I try to resize a photo on Photoshop CS5, it shuts down. (I modified an OpenGL option, and I don't have this problem any more)
When I click with my mouse for the dashboard to come, it shuts down.
Could you please help me with this? I don't know what to do.
Thank you.

I mean it powers off completely. No error message. Just the power goes off as if I shut it down myself with the normal procedure.
New development: I have two graphic cards: ATI Radeon 2600 and NVIDIA 8800.
With the NVIDIA I get shut downs when I view the dashboard, almost each time.
With the ATI I get shut downs sporadically. After one shut down, when I pressed the button to start the computer, it got to the phase when showing the white page with the Apple Logo, and it powered off. I waited 5-6 minutes and it is now running without any shut downs.
I believe it has something to do with the drivers. But I'm not sure. What steps should I follow to eliminate some aspects? What's your theory?
Thank you for your time.

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    panic(cpu 5 caller 0xffffff7f999066a4): NVRM[0/4:0:0]: Read Error 0x00002100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0x8a000000 0xffffff827e13b000 0x0e4000a2, D0, P2/4
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    0xffffff82776cbc60 : 0xffffff7f999066a4
    0xffffff82776cbd20 : 0xffffff7f999e0774
    0xffffff82776cbd70 : 0xffffff7f99c1605d
    0xffffff82776cbdc0 : 0xffffff7f99c4ea83
    0xffffff82776cbe20 : 0xffffff7f99a05b8f
    0xffffff82776cbe40 : 0xffffff7f9990ca2d
    0xffffff82776cbef0 : 0xffffff80190b0a20
    0xffffff82776cbf30 : 0xffffff80190af4c2
    0xffffff82776cbf80 : 0xffffff80190af597
    0xffffff82776cbfb0 : 0xffffff8018cd7607
          Kernel Extensions in backtrace:
             com.nvidia.web.NVDAResmanWeb(8.2.7)[F79A7264-B40F-34B4-9999-D6F903ED90E0]@0xfff fff7f998b1000->0xffffff7f99b5cfff
                dependency: com.apple.iokit.IOPCIFamily(2.9)[2852ACFE-FD28-3C37-9B39-885201BB8D25]@0xffffff 7f992bf000
                dependency: com.apple.iokit.IONDRVSupport(2.4.1)[D41125CE-69BD-32E7-9B1D-4E83431662DD]@0xff ffff7f9989b000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[75D81741-64C1-3941-ADFA-9D6B6C434EE4]@0 xffffff7f993a3000
                dependency: com.apple.AppleGraphicsDeviceControl(3.6.22)[91D61DEC-2946-3790-8134-B808C016C4 C9]@0xffffff7f998ab000
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                dependency: com.nvidia.web.NVDAResmanWeb(8.2.7)[F79A7264-B40F-34B4-9999-D6F903ED90E0]@0xfff fff7f998b1000
                dependency: com.apple.iokit.IOPCIFamily(2.9)[2852ACFE-FD28-3C37-9B39-885201BB8D25]@0xffffff 7f992bf000
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    Mac OS version:
    13F34
    <Re-Titled By Host>

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    0xffffff82927dbc50 : 0xffffff7f9d015a35
    0xffffff82927dbd10 : 0xffffff7f9d015e05
    0xffffff82927dbd70 : 0xffffff7f9d016096
    0xffffff82927dbdc0 : 0xffffff7f9d04ea83
    0xffffff82927dbe20 : 0xffffff7f9ce05b8f
    0xffffff82927dbe40 : 0xffffff7f9cd0ca2d
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    0xffffff82927dbf30 : 0xffffff801c4af4c2
    0xffffff82927dbf80 : 0xffffff801c4af597
    0xffffff82927dbfb0 : 0xffffff801c0d7607
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             com.nvidia.web.NVDAResmanWeb(8.2.7)[F79A7264-B40F-34B4-9999-D6F903ED90E0]@0xfff fff7f9ccb1000->0xffffff7f9cf5cfff
                dependency: com.apple.iokit.IOPCIFamily(2.9)[2852ACFE-FD28-3C37-9B39-885201BB8D25]@0xffffff 7f9c6bf000
                dependency: com.apple.iokit.IONDRVSupport(2.4.1)[D41125CE-69BD-32E7-9B1D-4E83431662DD]@0xff ffff7f9cc9b000
                dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[75D81741-64C1-3941-ADFA-9D6B6C434EE4]@0 xffffff7f9c7a3000
                dependency: com.apple.AppleGraphicsDeviceControl(3.6.22)[91D61DEC-2946-3790-8134-B808C016C4 C9]@0xffffff7f9ccab000
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    com.apple.driver.Oxford_Semi 3.4.1
    com.apple.filesystems.autofs 3.0
    com.apple.iokit.IOBluetoothSerialManager 4.2.7f3
    com.apple.driver.AudioAUUC 1.60
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    com.apple.driver.AppleUpstreamUserClient 3.5.13
    com.apple.driver.AppleMCCSControl 1.2.5
    com.apple.iokit.IOUserEthernet 1.0.0d1
    com.apple.driver.AppleLPC 1.7.0
    com.apple.driver.AppleMCEDriver 1.1.9
    com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
    com.apple.Dont_Steal_Mac_OS_X 7.0.0
    com.apple.driver.AppleHWAccess 1
    com.apple.iokit.SCSITaskUserClient 3.6.7
    com.apple.driver.XsanFilter 404
    com.apple.driver.AppleIntel8254XEthernet 3.1.4b1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
    com.apple.iokit.IOAHCIBlockStorage 2.6.0
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
    com.apple.BootCache 35
    com.apple.driver.AppleUSBHub 683.4.0
    com.apple.driver.AppleFWOHCI 5.0.2
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    com.apple.driver.AppleAPIC 1.7
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    com.apple.security.SecureRemotePassword 1.0
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.7f3
    com.apple.driver.AppleUSBHIDKeyboard 170.15
    com.apple.driver.AppleHIDKeyboard 170.15
    com.apple.driver.AppleUSBMergeNub 650.4.0
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    com.apple.iokit.IOUSBHIDDriver 660.4.0
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    com.apple.iokit.IOAudioFamily 1.9.7fc2
    com.apple.kext.OSvKernDSPLib 1.14
    com.apple.iokit.IOSerialFamily 10.0.7
    com.apple.driver.IOPlatformPluginLegacy 1.0.0
    com.apple.driver.IOPlatformPluginFamily 5.7.1d6
    com.apple.driver.AppleSMC 3.1.8
    com.apple.iokit.IOFireWireIP 2.2.6
    com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.7
    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.IOFireWireFamily 4.5.5
    com.apple.iokit.IOUSBUserClient 660.4.2
    com.apple.iokit.IO80211Family 640.36
    com.apple.iokit.IONetworkingFamily 3.2
    com.apple.iokit.IOSCSIParallelFamily 3.0.0
    com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.7
    com.apple.iokit.IOAHCIFamily 2.6.5
    com.apple.iokit.IOATAFamily 2.5.2
    com.apple.iokit.IOUSBFamily 686.4.1
    com.apple.driver.AppleEFINVRAM 2.0
    com.apple.iokit.IOHIDFamily 2.0.0
    com.apple.driver.AppleEFIRuntime 2.0
    com.apple.iokit.IOSMBusFamily 1.1
    com.apple.security.sandbox 278.11.1
    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.security.TMSafetyNet 7
    com.apple.driver.AppleKeyStore 2
    com.apple.driver.DiskImages 371.1
    com.apple.iokit.IOStorageFamily 1.9
    com.apple.iokit.IOReportFamily 23
    com.apple.driver.AppleFDEKeyStore 28.30
    com.apple.driver.AppleACPIPlatform 2.0
    com.apple.iokit.IOPCIFamily 2.9
    com.apple.iokit.IOACPIFamily 1.4
    com.apple.kec.corecrypto 1.0
    com.apple.kec.pthread 1
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    Memory Module: DIMM Riser A/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser A/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser B/DIMM 3, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser B/DIMM 4, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser A/DIMM 3, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser A/DIMM 4, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x88), Broadcom BCM43xx 1.0 (5.10.131.36.16)
    Bluetooth: Version 4.2.7f3 14616, 3 services, 14 devices, 1 incoming serial ports
    Network Service: Ethernet 2, Ethernet, en1
    Network Service: Ethernet 1, Ethernet, en0
    PCI Card: NVIDIA GeForce GTX 680, Display Controller, Slot-1
    PCI Card: NVIDIA GeForce GTX 680, NVDA,Parent, Slot-1
    PCI Card: ATTO ExpressPCI UL5D LP, SCSI Bus Controller, Slot-2@2,4,0
    PCI Card: DeckLink HD Extreme 2, Video, Slot-4
    PCI Card: ATTO ExpressPCI UL5D LP, SCSI Bus Controller, Slot-2@2,4,1
    Serial ATA Device: OWC Mercury EXTREME Pro 6G SSD, 480.1 GB
    Serial ATA Device: WDC WD5000AAKS-41YGA1, 500.11 GB
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    Parallel ATA Device: PIONEER DVD-RW  DVR-112D
    SCSI Device: SCSI Target Device @ 0
    SCSI Device: SCSI Target Device @ 0
    USB Device: Hub
    USB Device: Keyboard Hub
    USB Device: Microsoft Wireless Optical Mouse® 1.00
    USB Device: Apple Keyboard
    USB Device: USB 2.0 FD
    USB Device: Apple Cinema HD Display
    USB Device: USB2.0 Hub
    USB Device: External
    USB Device: NS1068
    USB Device: NS1068
    USB Device: Hub
    USB Device: FCR-HS219/1 Mobile Reader
    USB Device: Live! Cam Connect HD VF0750
    USB Device: Apple Cinema HD Display
    USB Device: Elements 10B8
    USB Device: External USB 3.0
    USB Device: Bluetooth USB Host Controller
    FireWire Device: built-in_hub, Up to 800 Mb/sec
    FireWire Device: unknown_device, OWC Mercury Elite-AL Pro, Up to 400 Mb/sec
    Thunderbolt Bus:
    Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 3 GHz, 20 GB, SMC 1.25f4
    Graphics: NVIDIA GeForce GTX 680, NVIDIA GeForce GTX 680, PCIe, 2048 MB
    Memory Module: DIMM Riser B/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser B/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser A/DIMM 1, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser A/DIMM 2, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
    Memory Module: DIMM Riser B/DIMM 3, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser B/DIMM 4, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser A/DIMM 3, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    Memory Module: DIMM Riser A/DIMM 4, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x80CE, 0x000000463732353142363245363830304600
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x88), Broadcom BCM43xx 1.0 (5.10.131.36.16)
    Bluetooth: Version 4.2.7f3 14616, 3 services, 14 devices, 1 incoming serial ports
    Network Service: Ethernet 2, Ethernet, en1
    Network Service: Ethernet 1, Ethernet, en0
    PCI Card: NVIDIA GeForce GTX 680, Display Controller, Slot-1
    PCI Card: NVIDIA GeForce GTX 680, NVDA,Parent, Slot-1
    PCI Card: ATTO ExpressPCI UL5D LP, SCSI Bus Controller, Slot-2@2,4,0
    PCI Card: DeckLink HD Extreme 2, Video, Slot-4
    PCI Card: ATTO ExpressPCI UL5D LP, SCSI Bus Controller, Slot-2@2,4,1
    Serial ATA Device: OWC Mercury EXTREME Pro 6G SSD, 480.1 GB
    Serial ATA Device: WDC WD5000AAKS-41YGA1, 500.11 GB
    Serial ATA Device: WDC WD5000AAKS-41YGA1, 500.11 GB
    Serial ATA Device: WDC WD5000AAKS-41YGA1, 500.11 GB
    Parallel ATA Device: PIONEER DVD-RW  DVR-112D
    Parallel ATA Device: PIONEER DVD-RW  DVR-112D
    SCSI Device: SCSI Target Device @ 0
    SCSI Device: SCSI Target Device @ 0
    USB Device: Hub
    USB Device: Keyboard Hub
    USB Device: Microsoft Wireless Optical Mouse® 1.00
    USB Device: Apple Keyboard
    USB Device: USB 2.0 FD
    USB Device: Apple Cinema HD Display
    USB Device: USB2.0 Hub
    USB Device: External
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    USB Device: Live! Cam Connect HD VF0750
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    USB Device: External USB 3.0
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    0xffffff80ff66bb50 : 0xffffff801d39fc12
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    com.Logitech.Unifying.HID Driver 1.3.1
    com.Logitech.Control Center.HID Driver 3.9.1
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    com.apple.driver.AudioAUUC 1.70
    com.apple.filesystems.autofs 3.0
    com.apple.driver.AGPM 100.15.5
    com.apple.driver.ApplePlatformEnabler 2.1.7d1
    com.apple.driver.X86PlatformShim 1.0.0
    com.apple.driver.AppleOSXWatchdog 1
    com.apple.driver.AppleGraphicsDevicePolicy 3.7.7
    com.apple.driver.AppleUpstreamUserClient 3.6.1
    com.apple.iokit.IOBluetoothSerialManager 4.3.2f6
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    com.apple.Dont_Steal_Mac_OS_X 7.0.0
    com.apple.driver.AppleHDA 269.25
    com.apple.driver.AppleIntelHD5000Graphics 10.0.2
    com.apple.driver.AppleHWAccess 1
    com.apple.driver.AppleThunderboltIP 2.0.2
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.2f6
    com.apple.driver.AppleHV 1
    com.apple.driver.AppleLPC 1.7.3
    com.apple.driver.AppleCameraInterface 5.29.0
    com.apple.driver.AppleSMCLMU 2.0.7d0
    com.apple.driver.AppleIntelFramebufferAzul 10.0.2
    com.apple.driver.AppleBacklight 170.5.0
    com.apple.driver.AppleMCCSControl 1.2.11
    com.apple.driver.AppleUSBTCButtons 240.2
    com.apple.driver.AppleUSBTCKeyboard 240.2
    com.apple.driver.AppleUSBCardReader 3.5.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
    com.apple.BootCache 35
    com.apple.driver.AppleUSBHub 705.4.2
    com.apple.driver.XsanFilter 404
    com.apple.iokit.IOAHCIBlockStorage 2.7.0
    com.apple.driver.AppleAHCIPort 3.1.0
    com.apple.driver.AppleFWOHCI 5.5.2
    com.apple.driver.AirPort.Brcm4360 910.26.12
    com.apple.driver.AppleUSBXHCI 710.4.11
    com.apple.driver.AppleSmartBatteryManager 161.0.0
    com.apple.driver.AppleACPIButtons 3.1
    com.apple.driver.AppleRTC 2.0
    com.apple.driver.AppleHPET 1.8
    com.apple.driver.AppleSMBIOS 2.1
    com.apple.driver.AppleACPIEC 3.1
    com.apple.driver.AppleAPIC 1.7
    com.apple.nke.applicationfirewall 161
    com.apple.security.quarantine 3
    com.apple.security.TMSafetyNet 8
    com.apple.kext.triggers 1.0
    com.apple.iokit.IOSerialFamily 11
    com.apple.driver.DspFuncLib 269.25
    com.apple.kext.OSvKernDSPLib 1.15
    com.apple.iokit.IOSurface 97
    com.apple.iokit.IOFireWireIP 2.2.6
    com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.2f6
    com.apple.driver.X86PlatformPlugin 1.0.0
    com.apple.driver.AppleGraphicsControl 3.8.6
    com.apple.driver.IOPlatformPluginFamily 5.8.1d38
    com.apple.driver.AppleSMC 3.1.9
    com.apple.AppleGraphicsDeviceControl 3.8.6
    com.apple.iokit.IOAcceleratorFamily2 156.6
    com.apple.iokit.IOUSBUserClient 705.4.0
    com.apple.driver.AppleHDAController 269.25
    com.apple.iokit.IOHDAFamily 269.25
    com.apple.iokit.IOAudioFamily 203.3
    com.apple.vecLib.kext 1.2.0
    com.apple.driver.AppleBacklightExpert 1.1.0
    com.apple.iokit.IONDRVSupport 2.4.1
    com.apple.driver.AppleSMBusController 1.0.13d1
    com.apple.iokit.IOGraphicsFamily 2.4.1
    com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.5.1
    com.apple.iokit.IOFireWireSBP2 4.2.5
    com.apple.driver.AppleUSBMultitouch 245.2
    com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.3
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    com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.3
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    com.apple.driver.IOBluetoothHIDDriver 4.3.2f6
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    com.apple.iokit.IOUSBHIDDriver 705.4.0
    com.apple.driver.AppleUSBComposite 705.4.9
    com.apple.driver.AppleThunderboltDPInAdapter 4.0.6
    com.apple.driver.AppleThunderboltDPAdapterFamily 4.0.6
    com.apple.driver.AppleThunderboltPCIUpAdapter 2.0.2
    com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2
    com.apple.driver.CoreStorage 471.10.6
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    com.apple.iokit.IOFireWireFamily 4.5.6
    com.apple.driver.AppleThunderboltNHI 3.1.7
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    com.apple.iokit.IO80211Family 710.55
    com.apple.driver.mDNSOffloadUserClient 1.0.1b8
    com.apple.iokit.IONetworkingFamily 3.2
    com.apple.iokit.IOUSBFamily 710.4.14
    com.apple.driver.AppleEFINVRAM 2.0
    com.apple.driver.AppleEFIRuntime 2.0
    com.apple.iokit.IOHIDFamily 2.0.0
    com.apple.iokit.IOSMBusFamily 1.1
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    com.apple.kext.AppleMatch 1.0.0d1
    com.apple.driver.AppleKeyStore 2
    com.apple.driver.AppleMobileFileIntegrity 1.0.5
    com.apple.driver.AppleCredentialManager 1.0
    com.apple.driver.DiskImages 396
    com.apple.iokit.IOStorageFamily 2.0
    com.apple.iokit.IOReportFamily 31
    com.apple.driver.AppleFDEKeyStore 28.30
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    USB Device: Apple Internal Keyboard / Trackpad
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