Delivered in 20 days, good packaging. AFTER cpu microcode was added to mobo's firmware (foxconn g31mx-k), it begin to work as expected.
One works, the other one doesn’t. Unfortunately, I wasted so much time on this, and doesn’t have any 775 boards or willing to test left. I sell low end PC for like $70~$100 USD here with xeon 771 series, I’m done with this. Modding bios, sometimes sticker moves and doesn’t wanna boot, etc. Too much hassle for too less benefit.