I have crashes constantly in my imac, can anyone help me to identify main cause? (Error report in post)

Hello, my imac crashes every day, sometimes it's simply stop working in a black screen. I think that's something about video card, because every crash, I see a black screen or messed screen.
Can anyone help me find the main cause? Below is my last error report.
Anonymous UUID:       DDB9DB5F-EA5B-B45F-F5A7-6307FCE2572B
Sat Sep 13 09:12:35 2014
Machine-check capabilities: 0x0000000000000806
family: 6 model: 23 stepping: 6 microcode: 1551
signature: 0x10676
Intel(R) Core(TM)2 Duo CPU     E8335  @ 2.66GHz
6 error-reporting banks
Processor 1: IA32_MCG_STATUS: 0x0000000000000005
IA32_MC0_STATUS(0x401): 0xb200004000000800
IA32_MC5_STATUS(0x415): 0xb200121020080400
panic(cpu 1 caller 0xffffff80158dcad9): "Machine Check at 0xffffff7f973e73f7, registers:\n" "CR0: 0x000000008001003b, CR2: 0x0000000103e46000, CR3: 0x00000000181f2000, CR4: 0x0000000000000660\n" "RAX: 0x0000000000000031, RBX: 0xffffff8020905000, RCX: 0x0000000000000001, RDX: 0x0000000000000400\n" "RSP: 0xffffff80ae9e3d50, RBP: 0xffffff80ae9e3d80, RSI: 0x0000000000000004, RDI: 0xffffff80a8c45148\n" "R8:  0x00000000e0000000, R9:  0x0000000000000004, R10: 0x0000000104236380, R11: 0x0000000000000202\n" "R12: 0x0000000000000004, R13: 0xffffff80209e1240, R14: 0xffffff7f97404e20, R15: 0x0000000000000520\n" "RFL: 0x0000000000000046, RIP: 0xffffff7f973e73f7, CS:  0x0000000000000008, SS:  0x0000000000000010\n" "Error code: 0x0000000000000000\n"@/SourceCache/xnu/xnu-2422.110.17/osfmk/i386/trap_native.c :168
Backtrace (CPU 1), Frame : Return Address
0xffffff80a8bd5e80 : 0xffffff8015822f79
0xffffff80a8bd5f00 : 0xffffff80158dcad9
0xffffff80a8bd6060 : 0xffffff80158f3fef
0xffffff80ae9e3d80 : 0xffffff7f973e0676
0xffffff80ae9e3e70 : 0xffffff7f973df8d9
0xffffff80ae9e3f30 : 0xffffff80158ddb0c
0xffffff80ae9e3f50 : 0xffffff801583758a
0xffffff80ae9e3f90 : 0xffffff80158378d8
0xffffff80ae9e3fb0 : 0xffffff80158d7417
      Kernel Extensions in backtrace:
         com.apple.driver.AppleIntelCPUPowerManagement(217.92.1)[CF28958D-CA8A-3A79-911C -78217F5DDAF2]@0xffffff7f973dd000->0xffffff7f97407fff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
13E28
Kernel version:
Darwin Kernel Version 13.3.0: Tue Jun  3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64
Kernel UUID: BBFADD17-672B-35A2-9B7F-E4B12213E4B8
Kernel slide:     0x0000000015600000
Kernel text base: 0xffffff8015800000
System model name: iMac8,1 (Mac-F226BEC8)
System uptime in nanoseconds: 53277101593110
last loaded kext at 52049652796768: com.apple.macos.driver.AppleUSBEthernetHost 7.0 (addr 0xffffff7f97bb0000, size 28672)
last unloaded kext at 52408741345770: com.apple.macos.driver.AppleUSBEthernetHost 7.0 (addr 0xffffff7f97bb0000, size 20480)
loaded kexts:
net.telestream.driver.TelestreamAudio 1.1.0
com.apple.filesystems.smbfs 2.0.2
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleBluetoothMultitouch 80.14
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AppleHDA 2.6.3f4
com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0
com.apple.driver.AudioAUUC 1.60
com.apple.iokit.IOUserEthernet 1.0.0d1
com.apple.iokit.IOBluetoothSerialManager 4.2.6f1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleBacklight 170.3.5
com.apple.driver.AppleSMCPDRC 1.0.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.driver.AppleLPC 1.7.0
com.apple.driver.AppleUpstreamUserClient 3.5.13
com.apple.driver.AppleMCCSControl 1.2.5
com.apple.kext.AMDFramebuffer 1.2.4
com.apple.ATIRadeonX2000 8.2.4
com.apple.kext.AMD2600Controller 1.2.4
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.AppleIRController 325.7
com.apple.iokit.SCSITaskUserClient 3.6.6
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.0
com.apple.driver.AppleUSBHub 683.4.0
com.apple.iokit.AppleYukon2 3.2.3b1
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleUSBEHCI 660.4.0
com.apple.driver.AirPortBrcm43224 700.36.24
com.apple.driver.AppleFWOHCI 5.0.2
com.apple.driver.AppleAHCIPort 3.0.5
com.apple.driver.AppleUSBUHCI 656.4.1
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleACPIButtons 2.0
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 2.0
com.apple.driver.AppleAPIC 1.7
com.apple.driver.AppleIntelCPUPowerManagementClient 217.92.1
com.apple.nke.applicationfirewall 153
com.apple.security.quarantine 3
com.apple.driver.AppleIntelCPUPowerManagement 217.92.1
com.apple.kext.triggers 1.0
com.apple.driver.IOBluetoothHIDDriver 4.2.6f1
com.apple.driver.AppleMultitouchDriver 245.13
com.apple.driver.DspFuncLib 2.6.3f4
com.apple.vecLib.kext 1.0.0
com.apple.driver.AppleHDAController 2.6.3f4
com.apple.iokit.IOHDAFamily 2.6.3f4
com.apple.driver.IOPlatformPluginLegacy 1.0.0
com.apple.iokit.IOAudioFamily 1.9.7fc2
com.apple.kext.OSvKernDSPLib 1.14
com.apple.iokit.IOSurface 91.1
com.apple.iokit.IOSerialFamily 10.0.7
com.apple.iokit.IOBluetoothFamily 4.2.6f1
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.6f1
com.apple.iokit.IOFireWireIP 2.2.6
com.apple.driver.AppleSMC 3.1.8
com.apple.driver.IOPlatformPluginFamily 5.7.1d6
com.apple.driver.AppleSMBusController 1.0.12d1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.kext.AMDSupport 1.2.4
com.apple.AppleGraphicsDeviceControl 3.6.22
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.AppleUSBHIDKeyboard 170.15
com.apple.driver.AppleHIDKeyboard 170.15
com.apple.iokit.IOUSBHIDDriver 660.4.0
com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.6
com.apple.iokit.IOUSBMassStorageClass 3.6.0
com.apple.driver.AppleUSBMergeNub 650.4.0
com.apple.driver.AppleUSBComposite 656.4.1
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.6
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 3.6.6
com.apple.iokit.IOUSBUserClient 660.4.2
com.apple.iokit.IOATAFamily 2.5.2
com.apple.iokit.IO80211Family 640.36
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOFireWireFamily 4.5.5
com.apple.iokit.IOAHCIFamily 2.6.5
com.apple.iokit.IOUSBFamily 683.4.0
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
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
Model: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 2.66 GHz, 4 GB, SMC 1.29f1
Graphics: ATI Radeon HD 2600 Pro, ATI Radeon HD 2600 Pro, PCIe, 256 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F98000000000000, 0x202020202020202020202020202020202020
Memory Module: BANK 1/DIMM1, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F98000000000000, 0x202020202020202020202020202020202020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.36.16)
Bluetooth: Version 4.2.6f1 14216, 3 services, 22 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Network Service: WiFi, AirPort, en1
Serial ATA Device: Hitachi HDP725032GLA380, 320,07 GB
Parallel ATA Device: OPTIARC  DVD RW AD-5630A
USB Device: Keyboard Hub
USB Device: Apple Keyboard
USB Device: SimpleDrive USB 2.0
USB Device: Built-in iSight
USB Device: BCM2046A
USB Device: IR Receiver
Thunderbolt Bus:

Based on other users asking for help with crashes - looks like you don't have enough RAM to run Maverick and other applications at the same time.
Find Apple has not been clear on what you should do before you upgrade - including finding out what software needs to be upgraded to work with mavericks and exactly how much RAM you need.
seems 4GB is just not enough.

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