Video card installed to PCIEX16.
When PCI-E x1 Sound card installed to PCIEX4 it cause random freezes in games.
Tried to reinstall Windows 7 and update bios to F16 and F17f, but it didn't help.
Gigabyte GA-Z77X-D3H - rev 1.0 - bios F16/F17f
Gigabyte GeForce GTX 650 Ti
Asus Xonar (Also try with Creative X-Fi) PCI-E x1 Sound card