ASUS ROG Rampage IV GENE Motherboard Review

Testing - Storage and USB

SATA - 6 GB/s




6 GB/s performance is very comparable across the board, with the X79 boards tending to tick a small notch below that of Z77, and all of the X79 boards performed very similarly.  The ASMedia controller also produced consistent results, and as we've said before, these 6GB/s ports are more like 4.5 GB/s ports, since we routinely see performance almost right in the middle of Intel 3 and 6 GB/s transfer speeds.


SATA - 3 GB/s




3 GB/s performance is almost flat across-the-board, even between X79 and Z77 and any differences are essentially indistinguishable.


USB 2.0


Again, USB 2.0 performance (even in high queue depth transfers which we didn't show to minimize redundancy) is a similar story to 3 GB/s SATA testing, basically a wash with the ROG Rampage IV Gene performing essentially identically with the other X79 boards we've tested.


USB 3.0



While X79 doesn't have "Intel Turbo" to take advantage of for USB 3.0 boost because X79 doesn't have native USB 3.0 like Z77, UASP protocols do a fantastic job of providing a significant boost in USB 3.0 transfer performance.  Base USB 3.0 performance on the Gene is comparable to the P9X79 boards, and the UASP mode actually bests the Z77X-UD3H in read speeds despite it using the Intel Turbo protocol that delivers an additional boost in performance on ASUS' Z77 boards.  The ATTO tests shown above exhibit high Queue Depth performance, and we see strong performance here as the speeds ramp up to full throughput at about 256 MB transfer sizes.


Keep in mind that while UASP protocol is faster than Intel Turbo boost, the Turbo Boost benefits from being directly linked/tied into the PCH.  We see UASP performance being slower than Intel Turbo Boost because it's handled by the ASMedia controller which is limited by a PCI-e x1 lane.  With Windows 8 and native UASP performance, you'll find UASP as the USB 3.0 protocol king.

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