In that case if anyone wants to analyze said log here is what seems to be the first one that started the whole mess:
Sun Jul 26 16:10:15 2015
Machine-check capabilities (cpu 1) 0x0000000000000006:
family: 6 model: 15 stepping: 6 microcode: 198
Intel(R) Xeon(R) CPU 5150 @ 2.66GHz
6 error-reporting banks
Machine-check status 0x0000000000000005:
restart IP valid
machine-check in progress
MCA error-reporting registers:
IA32_MC0_STATUS(0x401): 0x1000000020000000 invalid
IA32_MC1_STATUS(0x405): 0x0000000000000000 invalid
IA32_MC2_STATUS(0x409): 0x0000000000000000 invalid
IA32_MC3_STATUS(0x40d): 0x0020000000000000 invalid
IA32_MC4_STATUS(0x411): 0x0000000000000011 invalid
IA32_MC5_STATUS(0x415): 0xb200001080200e0f valid
MCA error code: 0x0e0f
Model specific error code: 0x8020
Other information: 0x00000010
Status bits:
Processor context corrupt
Error enabled
Uncorrected error
panic(cpu 1 caller 0x2aaf41): Machine Check at 0x009c4bc4, thread:0x2a46b3d4, trapno:0x12, err:0x0,registers:
CR0: 0x8001003b, CR2: 0x44329c80, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x2a8c5204, EBX: 0x00000009, ECX: 0x2a9e7004, EDX: 0x2a8c5204
ESP: 0x9fcd3ba0, EBP: 0x9fcd3be8, ESI: 0x2a99a004, EDI: 0x00000009
EFL: 0x00000202, EIP: 0x009c4bc4
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x9887afb8 : 0x21b837 (0x5dd7fc 0x9887afec 0x223ce1 0x0)
0x9887b008 : 0x2aaf41 (0x59dfe4 0x59e0d1 0x9c4bc4 0x2a46b3d4)
0x9887b0f8 : 0x2a29f2 (0x1 0x458b0424 0x24048908 0x32896ff)
0x9fcd3be8 : 0x9c4e00 (0x897db004 0x9 0x1 0x0)
0x9fcd3c08 : 0xb9805a (0x2a99a004 0x9 0x0 0x0)
0x9fcd3c38 : 0xab4aa4 (0x2a99a004 0x9fcd3c78 0x0 0x0)
0x9fcd3c98 : 0xbb5877 (0x2a9e7004 0x2a938004 0x26 0x0)
0x9fcd3d28 : 0x128a5ac (0x2a9e7004 0x2b0cd004 0xffffffff 0x26)
0x9fcd3d58 : 0x12e7238 (0x2a9e7004 0x2b0cd004 0x0 0x0)
0x9fcd3df8 : 0xb0e258 (0x2a9e7004 0x2a9f3004 0x0 0x0)
0x9fcd3e38 : 0x9dde2b (0x2a9e7004 0x2a9f3004 0x0 0x0)
0x9fcd3ed8 : 0x553ec7 (0x0 0x2b18ab00 0x1 0x2a46b3d4)
0x9fcd3f28 : 0x552ea6 (0x2b18ab00 0x7 0x9fcd3fc8 0x2ab75b)
0x9fcd3f88 : 0x552eea (0x2a2af300 0x2b0653d4 0x8b60153b 0xffffffff)
0x9fcd3fc8 : 0x2a179c (0x2a2af300 0x0 0x10 0x2a85c9e4)
Kernel Extensions in backtrace (with dependencies):
com.apple.nvidia.nv40hal(6.4.2)@0x1247000->0x13e4fff
dependency: com.apple.NVDAResman(6.4.2)@0x96e000
com.apple.NVDAResman(6.4.2)@0x96e000->0xc5bfff
dependency: com.apple.iokit.IOPCIFamily(2.6.8)@0x928000
dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x961000
dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x93f000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K549
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)
System uptime in nanoseconds: 2443467034103
unloaded kexts:
com.apple.driver.AppleFileSystemDriver 2.0 (addr 0xe66000, size 0x12288) - last unloaded 84257062013
loaded kexts:
com.apple.driver.AppleHWSensor 1.9.3d0
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AppleUpstreamUserClient 3.5.7
com.apple.driver.AppleMCCSControl 1.0.26
com.apple.driver.AppleHDA 2.0.8f3
com.apple.driver.AudioAUUC 1.57
com.apple.GeForce 6.4.2
com.apple.driver.AppleMCEDriver 1.1.9
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AudioIPCDriver 1.1.6
com.apple.driver.AppleIntelMeromProfile 19
com.apple.driver.ACPI_SMC_PlatformPlugin 4.7.0a1
com.apple.driver.AppleLPC 1.5.1
com.apple.iokit.IOAHCIBlockStorage 1.6.6
com.apple.iokit.SCSITaskUserClient 2.6.9
com.apple.BootCache 31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleFWOHCI 4.7.7
com.apple.driver.AppleUSBHub 4.2.5
com.apple.driver.AppleIntel8254XEthernet 2.1.3b1
com.apple.driver.AppleAHCIPort 2.2.0
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleEFINVRAM 1.4.0
com.apple.driver.AppleUSBEHCI 4.2.6
com.apple.driver.AppleUSBUHCI 4.2.5
com.apple.driver.AppleACPIButtons 1.3.6
com.apple.driver.AppleRTC 1.3.1
com.apple.driver.AppleHPET 1.5
com.apple.driver.AppleSMBIOS 1.7
com.apple.driver.AppleACPIEC 1.3.6
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 142.6.0
com.apple.security.sandbox 1
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.1.14
com.apple.driver.AppleIntelCPUPowerManagement 142.6.0
com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.9 - last loaded 615065264226
com.apple.iokit.IOUSBMassStorageClass 2.6.7
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.DspFuncLib 2.0.8f3
com.apple.driver.AppleProfileTimestampAction 10
com.apple.driver.AppleProfileThreadInfoAction 14
com.apple.driver.AppleProfileRegisterStateAction 10
com.apple.driver.AppleProfileKEventAction 10
com.apple.driver.AppleProfileCallstackAction 20
com.apple.nvidia.nv40hal 6.4.2
com.apple.NVDAResman 6.4.2
com.apple.iokit.IOFireWireIP 2.0.4
com.apple.driver.AppleHDAController 2.0.8f3
com.apple.iokit.IOHDAFamily 2.0.8f3
com.apple.iokit.IOSurface 74.2
com.apple.iokit.IOBluetoothSerialManager 2.4.5f3
com.apple.iokit.IOSerialFamily 10.0.3
com.apple.iokit.IOAudioFamily 1.8.3fc2
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.ApplePolicyControl 3.0.17
com.apple.driver.AppleGraphicsControl 3.0.17
com.apple.iokit.IONDRVSupport 2.2.1
com.apple.iokit.IOGraphicsFamily 2.2.1
com.apple.iokit.AppleProfileFamily 41
com.apple.driver.AppleSMC 3.1.0d5
com.apple.driver.IOPlatformPluginFamily 4.7.0a1
com.apple.iokit.IOUSBHIDDriver 4.2.5
com.apple.driver.XsanFilter 402.1
com.apple.driver.AppleUSBMergeNub 4.2.5
com.apple.driver.AppleUSBComposite 3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.9
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6.1
com.apple.iokit.IOATAPIProtocolTransport 2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily 2.6.9
com.apple.iokit.IOFireWireFamily 4.2.7
com.apple.iokit.IOUSBUserClient 4.2.4
com.apple.iokit.IONetworkingFamily 1.10
com.apple.iokit.IOAHCIFamily 2.0.7
com.apple.iokit.IOATAFamily 2.5.1
com.apple.iokit.IOUSBFamily 4.2.6
com.apple.driver.AppleEFIRuntime 1.4.0
com.apple.iokit.IOHIDFamily 1.6.6
com.apple.iokit.IOSMBusFamily 1.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 6
com.apple.driver.DiskImages 289.1
com.apple.iokit.IOStorageFamily 1.6.3
com.apple.driver.AppleACPIPlatform 1.3.6
com.apple.iokit.IOPCIFamily 2.6.8
com.apple.iokit.IOACPIFamily 1.3.0
Now there are 5 more logs and I'm not sure it is the same problem each time but starting here seems like more than enough right now.
Thanks.