My Latencymon log after an hour:
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CONCLUSION
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Your system appears to be having trouble handling real-time audio and other tasks. You are likely to experience buffer underruns appearing as drop outs, clicks or pops. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:56:46 (h:mm:ss) on all processors.
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SYSTEM INFORMATION
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Computer name: xxx
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: ASUSTeK COMPUTER INC., P8Z77-V PRO
CPU: GenuineIntel Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
Logical processors: 4
Processor groups: 1
RAM: 8135 MB total
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CPU SPEED
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Reported CPU speed: 340 MHz
Measured CPU speed: 1 MHz (approx.)
Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.
WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.
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MEASURED INTERRUPT TO USER PROCESS LATENCIES
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The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.
Highest measured interrupt to process latency (µs): 12355.967267
Average measured interrupt to process latency (µs): 2.573874
Highest measured interrupt to DPC latency (µs): 12322.838120
Average measured interrupt to DPC latency (µs): 0.910114
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REPORTED ISRs
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Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.
Highest ISR routine execution time (µs): 59.740294
Driver with highest ISR routine execution time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation
Highest reported total ISR routine time (%): 0.048651
Driver with highest ISR total time: dxgkrnl.sys - DirectX Graphics Kernel, Microsoft Corporation
Total time spent in ISRs (%) 0.054745
ISR count (execution time <250 µs): 527596
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 0
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0
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REPORTED DPCs
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DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.
Highest DPC routine execution time (µs): 123.093824
Driver with highest DPC routine execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 355.82 , NVIDIA Corporation
Highest reported total DPC routine time (%): 0.026230
Driver with highest DPC total execution time: nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 355.82 , NVIDIA Corporation
Total time spent in DPCs (%) 0.067966
DPC count (execution time <250 µs): 2990012
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 0
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0
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REPORTED HARD PAGEFAULTS
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Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.
NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.
Process with highest pagefault count: adobe_flash_player.exe
Total number of hard pagefaults 6984
Hard pagefault count of hardest hit process: 3630
Highest hard pagefault resolution time (µs): 216962.657647
Total time spent in hard pagefaults (%): 0.069581
Number of processes hit: 23
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PER CPU DATA
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CPU 0 Interrupt cycle time (s): 17.255411
CPU 0 ISR highest execution time (µs): 59.740294
CPU 0 ISR total execution time (s): 7.456759
CPU 0 ISR count: 527496
CPU 0 DPC highest execution time (µs): 123.093824
CPU 0 DPC total execution time (s): 6.915567
CPU 0 DPC count: 2153775
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CPU 1 Interrupt cycle time (s): 1.532843
CPU 1 ISR highest execution time (µs): 46.728824
CPU 1 ISR total execution time (s): 0.001673
CPU 1 ISR count: 100
CPU 1 DPC highest execution time (µs): 71.945588
CPU 1 DPC total execution time (s): 0.551784
CPU 1 DPC count: 232413
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CPU 2 Interrupt cycle time (s): 1.617932
CPU 2 ISR highest execution time (µs): 0.0
CPU 2 ISR total execution time (s): 0.0
CPU 2 ISR count: 0
CPU 2 DPC highest execution time (µs): 84.756471
CPU 2 DPC total execution time (s): 0.692168
CPU 2 DPC count: 258754
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CPU 3 Interrupt cycle time (s): 2.075660
CPU 3 ISR highest execution time (µs): 0.0
CPU 3 ISR total execution time (s): 0.0
CPU 3 ISR count: 0
CPU 3 DPC highest execution time (µs): 78.088824
CPU 3 DPC total execution time (s): 1.100128
CPU 3 DPC count: 345070
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Pagefaults after an hour: