Welcome to SF.
Update your network driver:
Driver c:\windows\system32\drivers\yk62x64.sys (11.10.5.3, 384.50 KB (393,728 bytes), 20/05/2009 10:10)
Don't OC your processor or video card.
Make sure, if you changed your voltage, it's reset and proper for memory.
See if that makes a difference.