I have the gigabyte P35-DS3R, and 4Gb of G.skill PC6400 HZ's. First off, they work! Secondly i am extremely happy with both parts, the motherboard has descent features and is extremely good at overclock. Finally the HZ's are great for the price, i currently have got them up to 1067Mhz (while only 2Gbs though) on stock voltage).