Hmmm hard to say because I had problem with Asus highend and mid grade 775 boards while not much of an issue with Gigabyte P43 board. Personally, I would pick the Gigabyte since it's preferred for Hackintosh. But both have DSDT patch so they should work as Hackintosh. There are differences between the P55 and H55 chipset but I can't really tell how important they are.