Found this thread through a lot of googling issues that have been plaguing my new pc build. It consists of the following components: Intel Core i3-3225 3.30GHz (Ivybridge) Socket LGA1155 Processor (55W) - Retail **High Performance IGP** Sapphire HD 7750 Low Profile Edition 1024MB GDDR5 PCI-Express Graphics Card Asus P8H77-I Intel H77 (Socket 1155) DDR3 MiniITX Motherboard Corsair Force Series 3 120GB SATA 2.5" 6Gb/s Solid State Drive Streacom Nano 150w HTPC Power Supply/Adapter Streacom ST-F7CB EVO HTPC Aluminium Case - Black Corsair XMS3 8GB (2x4GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit I'm sure the low wattage of the PSU jumps out to people but I do not believe it to be the issue. I can run fairly demanding games no issue for upto an hour or more then what seems to be audio or usb keyboard lockups cause the pc to freeze. I have also ran prime95 (cpu and ram stress test) and furmark (gpu stress test) at the same time for 15 minutes both pushing their respective components at 100% all the way through with no mouse lockups, no freezes and no BSOD's. I also ran memtest on my RAM no issues showed up. So I feel I can rule out processor, gpu and RAM as issues. Yet as I mentioned I had these lockups while gaming, randomly occurring when browsing or when playing music. I run Windows 8, yet had these issues occur on Windows 7. The issues actually occurred so frequently on Windows 7 it prompted me to move to Windows 8. The pc is hooked upto my TV through HDMI, the keyboard and mouse is a wireless logitech k400 combi connected with a logitech unifying usb dongle, network connectivity is generally through an Edimax wifi dongle. After much searching I found the issues to be related to DPC latency where I tested it with LatencyMon it pointed to USBPORT.SYS - USB 1.1 & 2.0 Port Driver being the culprit for highest IRC and DRC. And steam.exe for pagefaults. LatencyMon would only run for a few seconds before locking up sometimes it would unlock intermittently so I could stop the test. Othertimes I would BSOD with DPC watchdog timeout. I updated my BIOS and SSD firmware to the latest versions and the issues persisted. So to troubleshoot issues I carried out the Windows 8 reset where it reinstalls itself but doesn't need the key reactivating. It gave me a clean slate to test from. I installed initially only drivers listed on the asus website for my motherboard. Then tried newer updates directly from Intel, ATI etc. as the crashes and BSOD's still persisted when running LatencyMon. Issues persisted with USBPORT.SYS - USB 1.1 & 2.0 Port Driver so I moved my usb devices to my USB 3.0 ports and the IRC reported issues with storport.sys - Microsoft Storage Port Driver, Microsoft Corporation and DRC Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation. The SSD is set to AHCI mode in windows and bios, I installed the latest Intel Rapid Storage Technology drivers. This got rid of storport.sys as highest IRC and Wdf01000.sys took up that title. I kept the system lean with little programs installed and tried out different hardware settings and combinations. Turned windows defender on demand scanning off as it showed up in LatencyMon. The audio was running through my ATI graphics card and using ATI audio drivers, I disabled the onboard sound in device manager. Issues persisted with BSOD'ing (DPC watchdog timeout) and freezing in latencymon. Removed the ATI audio drivers, still BSOD'ing and freezing in latencymon. Turned pagefiles and indexing off. HPET was activated in BIOS but not windows, so I switched it on in windows: bcdedit /set useplatformclock true restarted the computer confirmed it was working and still BSOD'ing and freezing in latencymon. Turned Intel Speedstep and Thermal Throttling off in BIOS, no change. Turned HPET off in BIOS and windows, no change. Removed the GPU and its drivers and catalyst control centre and ran through the onboard graphics firstly without the Intel HD4000 drivers with BSOD'ing and freezing in latencymon. With the Intel HD4000 drivers, no change. The system actually seems less stable and more prone to random freezes and BSOD's without the dedicated graphics. The usb devices were in the USB 3.0 ports at this time, when I moved the usb devices one at and time and both onto usb 2 ports the USBPORT.SYS started to show up in latencymon again whenever a usb device was in these ports with freezes and BSOD's. I removed the usb wifi dongle and used ethernet, no change. Removed the logitech unifying dongle and used TeamViewer to control the PC so no usb devices present, no change. Tried with no network connectivity and using my Logitech k400, no change. After finding this thread I tried to record xperf but the system freezes requiring a hard reset or BSOD's so nothing is saved. Attached my latest latencymon results, as you can see I could only run it for 1 second as it would consistently freezes after 3 seconds, sometimes unfreeze for a split second to update the clock but not long enough to click stop. But mostly it would just BSOD with DPC watchdog timeout. I am almost certain its an RMA of the motherboard to ASUS but would like some second opinions before I do. Untitleddocument.txt