Don't know anything about these, however other sellers seem to have them around the £200.
The Maximus Extreme motherboard provides awesome Overclocking speeds and challenges performance limitations. Equipped with the innovative Crosslinx technology for increased performance, it utilizes the Fusion Block System - an effective 0dB fanless design cooling system with a chipset waterblock that adds onto a power user's existing watercooling circuit to help keep operations cool. Additionally, SuperemeFX II not only increases the sound quality, it also enhances aesthetic value. The Maximus Extreme also adopts the Intel X38/ICH9R chipset and supports cutting-edge DDR3 dual channel memory and CrossFire Technology - making it the Overclocker and Gamer's first and best choice.