ASUS Rampage IV Black Edition Review
 

When Ivy Bridge-E arrived, there was discontent at the lack of a new chipset. Users who wanted to migrate to the high performance end of the spectrum received a relatively small bump in performance over Sandy Bridge-E and Haswell on the mainstream was offering better IPC. To compound all this, the X79 chipset looks dated, with no native USB 3.0 and only two SATA 6 Gbps. ASUS have tried to address this balance somewhat by releasing an upgrade to the bestselling X79 motherboard: the Rampage IV Black Edition is an evolution of the Rampage IV Extreme, incorporating as many aspects of the Maximus Z87 series as possible into an antiquated chipset.

http://www.anandtech.com/show/7612/asus-rivbe