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Hi! Ive followed this thread for a while to try figure out what causing my DPC spikes. But now ill give up... This is the log from Latencymon. Your system appears to be suitable for playing real time audio without dropouts. Time running: 0:02:42 Highest DPC routine execution time (µs): 995 Responsible driver: ataport.SYS (ATAPI Driver Extension, Microsoft Corporation) DPC count (execution time <500 µs): 6965176 DPC count (execution time 500-999 µs): 58 DPC count (execution time 1000-1999 µs): 0 DPC count (execution time 2000-3999 µs): 0 DPC count (execution time >=4000 µs): 0 Highest ISR routine execution time (µs): 200 Responsible driver: ataport.SYS (ATAPI Driver Extension, Microsoft Corporation) ISR count (execution time <250 µs): 8822632 ISR count (execution time 250-499 µs): 0 ISR count (execution time 500-999 µs): 0 ISR count (execution time 1000-1999 µs): 0 ISR count (execution time >=2000 µs): 0 Highest pagefault resolution time (µs): 1010689 Hard pagefault count (total): 158579 Number of processes hit: 41 Pagefault count of hardest hit process: 32029 Process with highest pagefault count: SearchIndexer.exe (PID: 3036) 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. Note: all execution times are calculated based on a fixed CPU clock speed of 3258 MHz. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results. I done testing with Xperf to. All pointing at USBPORT.SYS & ATAPORT.SYS Updated BIOS and Chipset drivers. Spec. Motherboard: Crosshair IV Formula Processor: AMD Phenom X6 GPU: ATI Radeon HD 5850