I've owned a DIY-built PC on a Gigabyte GA-EP35C-DS3R motherboard for\nabout 2 years now. When I first built this PC, it ran perfectly under\nWindows XP 32-bit. Performance was good, and I had no issues with\nfreezeups or audio distortion. I recently upgraded to Windows 7 64-\nbit, and since then, I've had serious performance problems. The system\noccasionally freezes up, usually for only a second but sometimes for\nmore than 15 seconds. I get distortion in audio playback through the\nonboard Realtek Azalia HD-Audio, which sounds like the audio is frozen\non a single tone for half a second or more, turning it into a buzzing\nsound. Video playback stops and stutters every few seconds as well.\nDisk and network performance are also significantly worse than under\nWindows XP. I get 2D graphics slowdowns drawing simple windows, like\nsomething out of 1995.\n\nI've done research on my issues and found that they seem to relate to\nproblems with driver DPC latency and hard pagefaults. I've been using\nthe DPC Latency checker from [URL]http://www.thesycon.de/deu/latency_check.shtml[/URL],\nand I see frequent spikes of latency over 4ms. Baseline latency is\nrarely lower than 0.5ms, and is usually around 1ms idle, closer to 2ms\nwhen working. I've also used the Latency Monitor tool at\n[URL]http://www.thesycon.de/deu/latency_check.shtml[/URL], and it's reported hard\npagefaults longer than 500ms, and DPC latency of over 2.3ms in\nnetbt.sys.\n\nI've tried disabling EIST and C1E in BIOS, and this helped a little\nbit. Disabling the onboard ethernet, sound, or USB also helps, but\nthis is unacceptable, as I require all of these functions.\n\nBefore anyone asks, I've spent weeks ruling out other possible causes.\nI've malware and spyware scanned with four separate programs. I've\nchkdsked, defragged, cleared temp files, rebuilt page files, and swept\nmy registry for errors with two different programs. I've disconnected\nevery piece of hardware I could, checked every internal connection,\nchecked my memory for errors with Memtest86+ for a whole weekend while\nI was out of town, run CPU burnin programs, swapped most of the\ncables, and even moved my RAID from the Intel Matrix controller to the\nGBB36X controller. I have a copy of Fedora 13 (GNU/Linux) on another\nboot drive which runs perfectly and extremely fast on this hardware.\nThere's something about the way Windows 7 interacts with this\nmotherboard.\n\nI've seen that other similar Gigabyte P35 motherboards have had this\nissue, and some have been helped by BIOS updates.\n\n[URL]http://forum.cakewalk.com/tm.aspx?m=1351472&mpage=1&key=[/URL]&quot;\n\n[URL]http://forums.tweaktown.com/gigabyte/26456-p35-motherboards-dpc-latency-spiking-19.html[/URL]\n\n[URL]http://forum.cockos.com/showthread.php?t=20413[/URL]\n\nI have the latest BIOS for my motherboard, which does not appear to\nhave had an update from Gigabyte regarding this issue. I've filed a\nticket with them in hopes that they can help.\n\nDoes anyone have any suggestions to how I might recover? I really\ndon't want to roll back to Windows XP!