I just built a core i7 rig about a month ago, and it has a very annoying problem, the PC will freeze for about 1-3 seconds randomly, and I have no idea when it is going to happen. It usually occurs while gaming, but it also has happened when I am just navigating through windows explorer or am working in Microsoft Office. I ran several virus/spyware tests all which came back negative, have flashed the BIOS to the latest version, have reformatted the hard drive, tried installing XP and Windows 7, instead of Vista but the issue still persists (on ALL of these OS-es). I have also run a Drive Fitness Test on all drives, and have tested the memory by swapping the RAM modules with a set from another computer. every test I have run is indicating that my hardware is fine, and I have tried reformatting and running different Operating Systems so it is not a software issue. I think it may be the board because it does strange things while POSTing sometimes like disabling my LAN ports completely when I did not touch the CMOS settings for onboard LAN, and once when restarting my computer it just did not POST at all and took me to a black screen, and did not beep at all. but I just don't know, and being an IT major in my school, I have learned that if it isn't anything else it is either the Power Supply, or the Motherboard.
My Specs:
CPU: Intel Core i7 920 w/ stock fan
Mobo: Gigabyte GA-EX58-UD5
RAM: 6GB G-Skill Triple Channel DDR3 1333 CAS 7
Graphics: Powercolor Radeon HD4830
PSU: Thermaltake 850W 3 +12v rails at 18A
Primary HD: Western Digital Caviar Black 640GB
Primary OS: Windows Vista Business 64-Bit
Secondary OS: Windows 7 Beta 64-Bit, Windows XP Pro w/ SP3