Need help on diagnosis of Graphics Issue

Hello,
I need help to determine if I am experiencing a graphics card issue and what my options are if there are any experts out there I would appreciate some feedback.
*My system info:*
Model Name: Mac Pro
Model Identifier: MacPro2,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 8 MB
Memory: 4 GB
Bus Speed: 1.33 GHz
Chipset Model: NVIDIA GeForce 8800 GT
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0602
Revision ID: 0x00a2
ROM Revision: 3233
*Description of Issue:* When playing 3D video games (i.e. Mass Effect 2 or Dragon Age) everything visually is fine for about 20 seconds and then I start to see pixelization (snow), texture anomalies and system freezes where mouse stops moving. It gives time slices occasionally so sometimes I can Alt + tab out of game and close it. Or the entire system just crashes. I think what is going on is some loop that is pegging either the CPU(s) or GPU.
Everything was working fine up until last night. I had been playing the games without issue. I am playing these games on Windows XP and Vista using Boot Camp.
This initially occurred on Windows XP playing Mass Effect 2.
These are the steps I took which essentially tell me it is not a software issue:
- Tested on another game Dragon Age (same result)
- Updated to latest Nvidia drivers (same result)
- Tested on separate Boot Camp Windows Vista with Dragon Age game (same result)
These results lead me to believe I may have a broken graphics card? But I want to be certain before I go out and purchase a new one.
*My Questions:*
- Is there some software to verify if my graphics card is shotty?
- Is re-seating the graphics card or memory worth trying?
- Cleaning the dust out of my machine?
- If I need a new graphics card, what are my options? Do I have to purchase it via Apple store? I would like to stick with an Nvidia card so am I stuck buying the same card I currently have or can I upgrade?
If anyone can help me I would greatly appreciate it.
Thank you,
Leapstepman

Is there some software to verify if my graphics card is shotty?
Techtool Pro has some testing, the AHT tests VRAM, but game benchmarks and stressing will tell you the most.
Is re-seating the graphics card or memory worth trying?
Absolutely. Just don't reinstall the graphics card until you clean it thoroughly.
Cleaning the dust out of my machine?
YES. A dust filled graphics card heatsink will cause the GPU to cook, and cause problems thet you describe.
If I need a new graphics card, what are my options? Do I have to purchase it via Apple store? I would like to stick with an Nvidia card so am I stuck buying the same card I currently have or can I upgrade?
You don't have to buy from Apple, but using with OS X limits your choices to Mac compatible or flashable PC versions.
There is an awful lot of user input into this topic here:
http://blog.macsales.com/602-testing-those-new-graphics-cards
Card reviews can also help:
http://www.anandtech.com/video/showdoc.aspx?i=3140&p=9
http://www.tomshardware.com/reviews/radeon-hd-4870,1964.html

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    System model name: iMac13,2 (Mac-FC02E91DDD3FA6A4)
    System uptime in nanoseconds: 6803568702028
    last loaded kext at 6803492572543: com.apple.driver.AppleUSBCDC   4.1.23 (addr 0xffffff7f84667000, size 16384)
    last unloaded kext at 3872250092603: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f84662000, size 12288)
    loaded kexts:
    com.apple.driver.AppleUSBCDC      4.1.23
    com.apple.filesystems.smbfs            1.8
    com.apple.driver.AppleBluetoothMultitouch         75.19
    com.apple.filesystems.ntfs    3.10
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleHWSensor  1.9.5d0
    com.apple.iokit.IOBluetoothSerialManager            4.1.3f3
    com.apple.filesystems.autofs           3.0
    com.apple.driver.AppleMikeyHIDDriver    122
    com.apple.driver.AGPM        100.12.87
    com.apple.driver.ApplePlatformEnabler    2.0.6d1
    com.apple.driver.X86PlatformShim            1.0.0
    com.apple.driver.AppleHDA            2.3.7fc4
    com.apple.iokit.IOUserEthernet       1.0.0d1
    com.apple.Dont_Steal_Mac_OS_X     7.0.0
    com.apple.driver.ApplePolicyControl         3.3.0
    com.apple.GeForce   8.1.0
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.3f3
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.driver.AppleSMCLMU     2.0.3d0
    com.apple.driver.AppleMikeyDriver           2.3.7fc4
    com.apple.driver.AppleBacklight     170.2.5
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.driver.AppleLPC  1.6.0
    com.apple.driver.AppleIntelHD4000Graphics       8.1.0
    com.apple.driver.AppleIntelFramebufferCapri     8.1.0
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib            1.0.0d1
    com.apple.BootCache           34
    com.apple.driver.XsanFilter 404
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.driver.AirPort.Brcm4331           614.20.16
    com.apple.driver.AppleSDXC           1.4.0
    com.apple.iokit.AppleBCM5701Ethernet    3.6.0b1
    com.apple.driver.AppleUSBHub      5.5.5
    com.apple.driver.AppleAHCIPort    2.5.1
    com.apple.driver.AppleUSBEHCI     5.5.0
    com.apple.driver.AppleUSBXHCI     5.5.5
    com.apple.driver.AppleEFINVRAM 1.7
    com.apple.driver.AppleACPIButtons           1.7
    com.apple.driver.AppleRTC 1.5
    com.apple.driver.AppleHPET           1.8
    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.driver.AppleBluetoothHIDKeyboard    170.2
    com.apple.driver.AppleHIDKeyboard         170.2
    com.apple.driver.IOBluetoothHIDDriver    4.1.3f3
    com.apple.driver.AppleMultitouchDriver   235.29
    com.apple.iokit.IOSerialFamily         10.0.6
    com.apple.kext.triggers        1.0
    com.apple.iokit.IOSCSIArchitectureModelFamily   3.5.5
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.iokit.IOAudioFamily        1.8.9fc11
    com.apple.kext.OSvKernDSPLib      1.6
    com.apple.iokit.IOSurface     86.0.4
    com.apple.iokit.IOBluetoothFamily 4.1.3f3
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport      4.1.3f3
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.nvidia.gk100hal   8.1.0
    com.apple.NVDAResman      8.1.0
    com.apple.driver.AppleSMC 3.1.4d2
    com.apple.driver.AppleGraphicsControl    3.3.0
    com.apple.driver.AppleBacklightExpert     1.0.4
    com.apple.driver.AppleSMBusController   1.0.11d0
    com.apple.driver.IOPlatformPluginFamily 5.3.0d51
    com.apple.driver.AppleThunderboltEDMSink       1.1.8
    com.apple.driver.AppleThunderboltEDMSource  1.1.8
    com.apple.driver.AppleSMBusPCI   1.0.11d0
    com.apple.driver.AppleHDAController       2.3.7fc4
    com.apple.iokit.IOHDAFamily          2.3.7fc4
    com.apple.iokit.IOAcceleratorFamily          30.14
    com.apple.iokit.IONDRVSupport     2.3.7
    com.apple.iokit.IOGraphicsFamily   2.3.7
    com.apple.iokit.IOUSBHIDDriver     5.2.5
    com.apple.driver.AppleThunderboltDPOutAdapter         1.8.9
    com.apple.driver.AppleThunderboltDPInAdapter            1.8.9
    com.apple.driver.AppleThunderboltDPAdapterFamily    1.8.9
    com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.6
    com.apple.driver.AppleUSBMergeNub       5.5.5
    com.apple.driver.AppleUSBComposite       5.2.5
    com.apple.driver.AppleThunderboltNHI    1.6.3
    com.apple.iokit.IOThunderboltFamily        2.2.6
    com.apple.iokit.IO80211Family       522.4
    com.apple.iokit.IOEthernetAVBController  1.0.2b1
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.iokit.IOUSBUserClient     5.5.5
    com.apple.iokit.IOAHCIFamily          2.3.1
    com.apple.iokit.IOUSBFamily           5.5.5
    com.apple.driver.AppleEFIRuntime            1.7
    com.apple.iokit.IOHIDFamily            1.8.1
    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
    Model: iMac13,2, BootROM IM131.010A.B04, 4 processors, Intel Core i5, 2.9 GHz, 8 GB, SMC 2.11f14
    Graphics: NVIDIA GeForce GTX 660M, NVIDIA GeForce GTX 660M, PCIe, 512 MB
    Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3431554638424455352D474E2D4620
    Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3431554638424455352D474E2D4620
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (5.106.98.100.16)
    Bluetooth: Version 4.1.3f3 11349, 2 service, 18 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Serial ATA Device: APPLE HDD ST1000DM003, 1 TB
    USB Device: UPS CP1000AVRLCD, 0x0764  (Cyber Power Systems, Inc.), 0x0501, 0x14400000 / 1
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1a100000 / 2
    USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8511, 0x1a110000 / 3
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1d100000 / 2
    USB Device: hub_device, 0x0424  (SMSC), 0x2412, 0x1d180000 / 3
    USB Device: BRCM20702 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1d181000 / 4
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x828b, 0x1d181300 / 5

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