Beta BIOS F9A for the 790X-UD4P and F7B for the 790XT-UD4P have been posted on the Gigabyte site.

Seems that it adds a "CPU Core Control" option. I'm assuming this means you can now choose which cores you want to use on your multi-core chip similar to the ASUS boards. I'm not sure though as I haven't checked myself yet. Just thought I'd let you guys know.