Uuuuh... this thread is really old, and it was determined that this was an Afterburner-based issue despite dillweed there having the thread moved to the wrong section.
There is no "jumper" or whatever you speak of an the Asus RoG Rampage IV Extreme, it was designed to natively support 4-Way Crossfire & 4-Way SLi. R9 290Xs do not need any sort of bridge or other "help" running crossfire, they just do it once the drivers are installed with more than one card present.
I'm aware you can disable the cards you don't need if a program doesn't scale well with Crossfire/TriFire/QuadFire, that wasn't the issue, nor were the drivers.
CPU: i7 3930k @ 4.6GHz 1.29V (Corsair H110-cooled) ~ Motherboard: Asus RoG Rampage IV Extreme
RAM: G.Skill Sniper Gaming Series (4x4GB 2133MHz, CL9) ~ PSU: Corsair AX 1200W ~ Case: Enermax Fulmo GT
GPUs: 3x HIS R9 290X Reference (Core) Editions in TriFire, Max Load Temps: 71C/70C/71C during OC testing :-P