iMac restarting itself automatically - help

My iMac restarts itself at least 3 times a day, usually when it's in standby mode. Running Mavericks. Below is a copy of the error report. Took it to apple store and they replaced the hard drive but it still does it. Please help

Anonymous UUID: 11B8C61A-3D83-9668-16E2-D4C5294D050B

Sat Dec 7 19:23:02 2013
panic(cpu 1 caller 0xffffff7fa15f7d0d): NVRM[0/1:0:0]: Read Error 0x0080000c: CFG 0x0fd510de 0x00100406 0xb0000000, BAR0 0x102c00000 0xffffff8115305000 0x0e7150a2, D0, P0/4
Backtrace (CPU 1), Frame : Return Address
0xffffff8133b93140 : 0xffffff8020c22f69
0xffffff8133b931c0 : 0xffffff7fa15f7d0d
0xffffff8133b93280 : 0xffffff7fa16c4e26
0xffffff8133b932c0 : 0xffffff7fa18c070a
0xffffff8133b932e0 : 0xffffff7fa18ba835
0xffffff8133b93340 : 0xffffff7fa16b4a6c
0xffffff8133b93440 : 0xffffff7fa16b549c
0xffffff8133b93490 : 0xffffff7fa15d7928
0xffffff8133b934e0 : 0xffffff7fa15d770b
0xffffff8133b93580 : 0xffffff7fa15fc52f
0xffffff8133b93780 : 0xffffff7fa15fdc16
0xffffff8133b93850 : 0xffffff7fa17983b7
0xffffff8133b93910 : 0xffffff7fa17a10a7
0xffffff8133b939d0 : 0xffffff7fa1795d57
0xffffff8133b93b60 : 0xffffff7fa15a8a2f
0xffffff8133b93be0 : 0xffffff7fa159915e
0xffffff8133b93c60 : 0xffffff7fa159be0b
0xffffff8133b93cd0 : 0xffffff7fa159bf97
0xffffff8133b93d40 : 0xffffff7fa159bf97
0xffffff8133b93db0 : 0xffffff7fa159bb4c
0xffffff8133b93e20 : 0xffffff7fa1563452
0xffffff8133b93e60 : 0xffffff7fa156284e
0xffffff8133b93e90 : 0xffffff7fa155ebc4
0xffffff8133b93ef0 : 0xffffff80210ada80
0xffffff8133b93f30 : 0xffffff80210ac522
0xffffff8133b93f80 : 0xffffff80210ac5f7
0xffffff8133b93fb0 : 0xffffff8020cd6aa7
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0xffffff7fa1554000->0xffffff7fa158bfff
dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff7fa12ba000
com.apple.iokit.IONDRVSupport(2.3.6)[86BA68C6-18DD-30A1-ABF6-54597AD6C277]@0xffffff7fa1597000->0xffffff7fa15a6fff
dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0xffffff7fa1554000
dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff7fa12ba000
com.apple.nvidia.driver.NVDAResman(8.1.8)[3A2A3C2D-E129-3190-A682-E831B38F0FBF]@0xffffff7fa15a7000->0xffffff7fa1811fff
dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff7fa12ba000
dependency: com.apple.iokit.IONDRVSupport(2.3.6)[86BA68C6-18DD-30A1-ABF6-54597AD6C277]@0xffffff7fa1597000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.6)[38E388A5-92D6-3388-B799-F2498E582287]@0xffffff7fa1554000
com.apple.nvidia.driver.NVDAGK100Hal(8.1.8)[3CF8C2FA-83E6-39E3-A5B7-C7CC839B8C75]@0xffffff7fa181c000->0xffffff7fa19cbfff
dependency: com.apple.nvidia.driver.NVDAResman(8.1.8)[3A2A3C2D-E129-3190-A682-E831B38F0FBF]@0xffffff7fa15a7000
dependency: com.apple.iokit.IOPCIFamily(2.8)[447B4896-16FF-3616-95A2-1C516B2A1498]@0xffffff7fa12ba000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
13A603

Kernel version:
Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
Kernel slide: 0x0000000020a00000
Kernel text base: 0xffffff8020c00000
System model name: iMac13,1 (Mac-00BE6ED71E35EB86)

System uptime in nanoseconds: 10390717335108
last loaded kext at 2722780768297: com.apple.filesystems.afpfs11.0 (addr 0xffffff7fa2fd7000, size 348160)
last unloaded kext at 247792895443: com.apple.driver.AppleFileSystemDriver3.0.1 (addr 0xffffff7fa2ecf000, size 8192)
loaded kexts:
com.apple.filesystems.afpfs11.0
com.apple.nke.asp-tcp8.0.0
com.apple.driver.AudioAUUC1.60
com.apple.driver.AppleBluetoothMultitouch80.14
com.apple.driver.AppleHWSensor1.9.5d0
com.apple.filesystems.autofs3.0
com.apple.iokit.IOBluetoothSerialManager4.2.0f6
com.apple.driver.AppleMikeyHIDDriver124
com.apple.driver.X86PlatformShim1.0.0
com.apple.driver.AGPM100.14.11
com.apple.driver.ApplePlatformEnabler2.0.9d1
com.apple.driver.AppleHDA2.5.2fc2
com.apple.iokit.IOUserEthernet1.0.0d1
com.apple.driver.AppleMikeyDriver2.5.2fc2
com.apple.driver.AppleUpstreamUserClient3.5.13
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport4.2.0f6
com.apple.driver.AppleIntelHD4000Graphics8.1.8
com.apple.Dont_Steal_Mac_OS_X7.0.0
com.apple.driver.AppleHWAccess1
com.apple.driver.AppleLPC1.7.0
com.apple.driver.AppleThunderboltIP1.0.10
com.apple.driver.AppleSMCLMU2.0.4d1
com.apple.GeForce8.1.8
com.apple.driver.AppleMCCSControl1.1.12
com.apple.driver.AppleIntelFramebufferCapri8.1.8
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib1.0.0d1
com.apple.BootCache35
com.apple.driver.XsanFilter404
com.apple.iokit.IOAHCIBlockStorage2.4.0
com.apple.driver.AppleUSBHub650.4.4
com.apple.driver.AirPort.Brcm4331700.20.22
com.apple.iokit.AppleBCM5701Ethernet3.6.9b9
com.apple.driver.AppleSDXC1.4.0
com.apple.driver.AppleUSBEHCI650.4.1
com.apple.driver.AppleAHCIPort2.9.5
com.apple.driver.AppleUSBXHCI650.4.3
com.apple.driver.AppleACPIButtons2.0
com.apple.driver.AppleRTC2.0
com.apple.driver.AppleHPET1.8
com.apple.driver.AppleSMBIOS2.0
com.apple.driver.AppleACPIEC2.0
com.apple.driver.AppleAPIC1.7
com.apple.driver.AppleIntelCPUPowerManagementClient216.0.0
com.apple.nke.applicationfirewall153
com.apple.security.quarantine3
com.apple.driver.AppleIntelCPUPowerManagement216.0.0
com.apple.security.SecureRemotePassword1.0
com.apple.driver.AppleBluetoothHIDKeyboard170.15
com.apple.driver.AppleHIDKeyboard170.15
com.apple.driver.IOBluetoothHIDDriver4.2.0f6
com.apple.driver.AppleMultitouchDriver245.13
com.apple.kext.triggers1.0
com.apple.iokit.IOSerialFamily10.0.7
com.apple.iokit.IOSCSIArchitectureModelFamily3.6.0
com.apple.driver.DspFuncLib2.5.2fc2
com.apple.vecLib.kext1.0.0
com.apple.iokit.IOAudioFamily1.9.4fc11
com.apple.kext.OSvKernDSPLib1.14
com.apple.iokit.IOBluetoothFamily4.2.0f6
com.apple.iokit.IOBluetoothHostControllerUSBTransport4.2.0f6
com.apple.iokit.IOSurface91
com.apple.nvidia.driver.NVDAGK100Hal8.1.8
com.apple.driver.AppleHDAController2.5.2fc2
com.apple.iokit.IOHDAFamily2.5.2fc2
com.apple.nvidia.driver.NVDAResman8.1.8
com.apple.iokit.IOAcceleratorFamily98.7.1
com.apple.driver.AppleSMBusPCI1.0.12d1
com.apple.driver.X86PlatformPlugin1.0.0
com.apple.driver.AppleSMC3.1.6d1
com.apple.driver.IOPlatformPluginFamily5.5.1d27
com.apple.driver.AppleThunderboltEDMSink1.2.1
com.apple.driver.AppleSMBusController1.0.11d1
com.apple.iokit.IOAcceleratorFamily298.7.1
com.apple.AppleGraphicsDeviceControl3.4.12
com.apple.iokit.IONDRVSupport2.3.6
com.apple.iokit.IOGraphicsFamily2.3.6
com.apple.driver.AppleThunderboltDPOutAdapter2.5.0
com.apple.driver.AppleThunderboltDPInAdapter2.5.0
com.apple.driver.AppleThunderboltDPAdapterFamily2.5.0
com.apple.driver.AppleThunderboltPCIDownAdapter1.4.0
com.apple.driver.CoreStorage380
com.apple.driver.AppleUSBMergeNub650.4.0
com.apple.driver.AppleUSBComposite650.4.0
com.apple.driver.AppleThunderboltNHI1.9.2
com.apple.iokit.IOThunderboltFamily2.8.5
com.apple.iokit.IO80211Family600.34
com.apple.iokit.IOUSBUserClient650.4.4
com.apple.iokit.IOEthernetAVBController1.0.3b3
com.apple.driver.mDNSOffloadUserClient1.0.1b4
com.apple.iokit.IONetworkingFamily3.2
com.apple.iokit.IOAHCIFamily2.6.0
com.apple.iokit.IOUSBFamily650.4.4
com.apple.driver.AppleEFINVRAM2.0
com.apple.driver.AppleEFIRuntime2.0
com.apple.iokit.IOHIDFamily2.0.0
com.apple.iokit.IOSMBusFamily1.1
com.apple.security.sandbox278.10
com.apple.kext.AppleMatch1.0.0d1
com.apple.security.TMSafetyNet7
com.apple.driver.AppleKeyStore2
com.apple.driver.DiskImages371.1
com.apple.iokit.IOStorageFamily1.9
com.apple.iokit.IOReportFamily21
com.apple.driver.AppleFDEKeyStore28.30
com.apple.driver.AppleACPIPlatform2.0
com.apple.iokit.IOPCIFamily2.8
com.apple.iokit.IOACPIFamily1.4
com.apple.kec.corecrypto1.0
com.apple.kec.pthread1
Model: iMac13,1, BootROM IM131.010A.B05, 4 processors, Intel Core i5, 2.9 GHz, 8 GB, SMC 2.9f5
Graphics: NVIDIA GeForce GT 650M, NVIDIA GeForce GT 650M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533643465238432D50422020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533643465238432D50422020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: APPLE HDD ST1000LM024, 1 TB
Serial ATA Device: APPLE SSD SM128E, 121.33 GB
USB Device: Hub
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Hub
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: iMac, Apple Inc., 23.4