According to the dump, your NVIDIA graphic driver for your GPU (VEN_10DE&DEV_1183) causes the crash:
******************************************************************************* * * * Bugcheck Analysis * * * ******************************************************************************* DRIVER_POWER_STATE_FAILURE (9f) A driver has failed to complete a power IRP within a specific time. Arguments: Arg1: 0000000000000003, A device object has been blocking an Irp for too long a time Arg2: ffffe000ef7a2320, Physical Device Object of the stack Arg3: fffff802d40f7990, nt!TRIAGE_9F_POWER on Win7 and higher, otherwise the Functional Device Object of the stack Arg4: ffffe0010734b010, The blocked IRP Debugging Details: ------------------ Implicit thread is now ffffe000`f6b69600 *** WARNING: Unable to verify timestamp for nvlddmkm.sys *** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys SYSTEM_SKU: To be filled by O.E.M. SYSTEM_VERSION: To be filled by O.E.M. BIOS_DATE: 05/30/2014 BASEBOARD_PRODUCT: Z97MX-Gaming 5 BASEBOARD_VERSION: x.x BUGCHECK_P1: 3 BUGCHECK_P2: ffffe000ef7a2320 BUGCHECK_P3: fffff802d40f7990 BUGCHECK_P4: ffffe0010734b010 DRVPOWERSTATE_SUBCODE: 3 FAULTING_THREAD: f6b69600 CPU_COUNT: 4 CPU_MHZ: dac CPU_VENDOR: GenuineIntel CPU_FAMILY: 6 CPU_MODEL: 3c CPU_STEPPING: 3 CUSTOMER_CRASH_COUNT: 1 DEFAULT_BUCKET_ID: WIN8_DRIVER_FAULT BUGCHECK_STR: 0x9F PROCESS_NAME: System CURRENT_IRQL: 2 ANALYSIS_VERSION: 10.0.10240.9 amd64fre LAST_CONTROL_TRANSFER: from fffff802d22bb0d0 to fffff802d23c8c76 STACK_TEXT: 00 nt!KiSwapContext 01 nt!KiSwapThread 02 nt!KiCommitThreadWait 03 nt!KeWaitForSingleObject 04 dxgkrnl!DpiRequestIoPowerState 05 dxgkrnl!DpiFdoSetAdapterPowerState 06 dxgkrnl!DpiFdoHandleDevicePower 07 dxgkrnl!DpiDispatchPower 08 nvlddmkm 09 0x0 0a 0x0 0b 0x0 STACK_COMMAND: .thread 0xffffe000f6b69600 ; kb FOLLOWUP_IP: dxgkrnl!DpiRequestIoPowerState+a2 fffff802`0247f682 8bd8 mov ebx,eax SYMBOL_STACK_INDEX: 4 SYMBOL_NAME: dxgkrnl!DpiRequestIoPowerState+a2 FOLLOWUP_NAME: MachineOwner MODULE_NAME: dxgkrnl IMAGE_NAME: dxgkrnl.sys DEBUG_FLR_IMAGE_TIMESTAMP: 55bebfed IMAGE_VERSION: 10.0.10240.16425 BUCKET_ID_FUNC_OFFSET: a2 FAILURE_BUCKET_ID: 0x9F_3_POWER_DOWN_dxgkrnl!DpiRequestIoPowerState BUCKET_ID: 0x9F_3_POWER_DOWN_dxgkrnl!DpiRequestIoPowerState PRIMARY_PROBLEM_CLASS: 0x9F_3_POWER_DOWN_dxgkrnl!DpiRequestIoPowerState ANALYSIS_SOURCE: KM FAILURE_ID_HASH_STRING: km:0x9f_3_power_down_dxgkrnl!dpirequestiopowerstate FAILURE_ID_HASH: Followup: MachineOwner --------- 0: kd> !podev ffffe000ef7a2320 Device object is for: DriverObject ef7ea820 Current Irp 00000000 RefCount 0 Type 00000023 AttachedDev ffffe000ef78bdb0 DevFlags 00001040 Device queue is not busy. Device Object Extension: ffffe000ef7a2a68: PowerFlags: 00000010 =>SystemState=0 DeviceState=1 Dope: 00000000: 0: kd> !devstack ffffe000ef78bdb0 !DevObj !DrvObj !DevExt ObjectName ffffe000f278c040 \Driver\nvlddmkm ffffe000f278c190 InfoMask field not found for _OBJECT_HEADER at ffffe000f278c010 > ffffe000ef78bdb0 \Driver\ACPI ffffe000ee094c70 ffffe000ef7a2320 \Driver\pci ffffe000ef7a2470 Cannot read info offset from nt!ObpInfoMaskToOffset !DevNode ffffe000ef78baa0 : DeviceInst is "PCI\VEN_10DE&DEV_1183&SUBSYS_35561458&REV_A1\4&1286464&0&0008" ServiceName is "nvlddmkm" 0: kd> lmvm nvlddmkm Browse full module list start end module name fffff802`02740000 fffff802`03233000 nvlddmkm T (no symbols) Loaded symbol image file: nvlddmkm.sys Image path: \SystemRoot\system32\DRIVERS\nvlddmkm.sys Image name: nvlddmkm.sys Browse all global symbols functions data Timestamp: Sun Sep 13 23:12:24 2015 Report it to nVIDIA in their forums and as a workaround try to disable all power saving options you can in the Geforce driver.