Had a happy little Gene VI/4770K/Corsair CMZ16GX3M4X1866C9R running on the 606 UEFI, all on auto except for XMP and the '4-way optimised' CPU at 4.2.
Then I updated to 615 and I'm getting code 00 on boot - I'm got the battery out right now having read the others on this site with the same problem.
I'm wondering if 615 is a little more sensitive when it comes to OC'ed memory perhaps? I may go back to 606 if the battery trick works.