Take the Gigabyte P45 UD3R or P45 UD3P, really great board for 45nm Quad CPU, got mine and went from max 450 FSB to 510+ fsb that is Linx Ok. Got from 3.8 to 4.3 Ghz for 24/7. Old one was Asus P35 P5K-E, that was good with 65nm Quads.