H55 is the less expensive Intel chipset for socket 1156. It has the onboard video ports, while the P series requires a separate card. My biostar h55 overclocked well so this chipset is a good choice for many folks and works ok with a separate video card. Newer features such as sata 3.0 and usb 3.0 aren't found on these boards. Later versions of the p55 boards may have these features so you pay more.