I knew the Haswell refresh CPUs were supported by the ASRock board in the latest BIOS, and since said BIOS was released in May 2014 and it's now September I had hoped the board would ship with the new BIOS on it. Alas it actually arrived with the very earliest BIOS revision (July 2013), so now I have to find/buy an early Haswell CPU purely so I can update the BIOS. Awesome.