G31 is x16 1.0, G41 is x16 2.0, only multi GPU setups, 5870/GTX 470 + currently benifit from 2.0
Soundmax ADi 2000B (high end Asus) sounds better than the Realtek ALC 889 (high end Gigabyte), low end Realtek sound like crap.
I h've had my Q9450 @ 3.6 OCCT/IBT stable on G31 (450FSB with Quad). With E5xxx, mobo capabilities hardly matters, Its the chip that cant do the FSB, not the board.