Overclocking: Asus Rampage IV Extreme Versus EVGA X79 FTW

Breaking Boundaries

Swipe to scroll horizontally
BIOS Frequency and Voltage settings (for overclocking)
Row 0 - Cell 0 Asus Rampage IV ExtremeEVGA X79 FTW 151-SE-E777-KR
Base Clock80-300 MHz (0.1 MHz)85-287.5 MHz (1 MHz)
CPU Multiplier12x to 57x (1x)0x to 60x (1x)
DRAM Data Rates800-2666 (266.6 MHz)1067-2400 (266.6 MHz)
CPU Vcore0.80-2.10 V (5 mV)0.90-1.99 V (1 mV)
CPU VCCSA0.80-1.70 V (5 mV)0.90-1.99 V (1 mV)
VTT Voltage1.05-1.70 V (6.25 mV)0.90-1.55 V (1 mV)
X79 PCH Voltage0.80-1.60 V (6.25 mV)0.71-2.59 V (40 mV)
DRAM Voltage1.20-2.1 V (5 mV)0.90-1.99 V (1 mV)
CAS Latency3-15 Cycles3-15 Cycles
tRCD4-15 Cycles3-15 Cycles
tRP4-15 Cycles3-15 Cycles
tRAS4-40 Cycles9-63 Cycles

While we attempted to use identical base clocks for our overclocking benchmarks, those weren’t necessarily the absolute overclocking limits of this processor. We found that by adding just a few hundred kilohertz to the base clock, the Rampage IV Extreme was capable of pushing an extra 67 MHz behind its highest 100 MHz BCLK result.

EVGA gained nothing, tolerating not even the tiniest increase beyond the 4.67 GHz previously found in our 133.3 MHz base clock attempts. The same stability limit could be reached at 101.5 MHz base clock by using a 46x multiplier.

Our processor doesn’t work well at the chipset's 1.66x strap, with Asus’ 153 MHz max representing an underclock of some components. Anything less than 153 MHz was too much of an underclock for those components (likely the PCIe and/or SATA controllers), and the X79 FTW couldn’t successfully fit the processor within the narrow frequency range that allowed this strap.

Experienced hands are required to reach DDR3-2133 on the X79 FTW, since its default timings weren’t stable using XMP values. We couldn’t use its 21.33x multiplier anyway, and this overclock required both manual timing configuration and a 133 MHz base clock.

Thomas Soderstrom
Thomas Soderstrom is a Senior Staff Editor at Tom's Hardware US. He tests and reviews cases, cooling, memory and motherboards.
  • EzioAs
    Nice article.

    Where is the MSI Big Bang Xpower II? That's known to be a great board for overclocking as well.
  • schn1tt3r
    I'd love to see a comparison like this between the Rampage IV Extreme and the Rampage IV Formula. The price difference is over $100 and I don't see WHY. 8 RAM slots is something I would never fill up so the Formula and its 4 slots seems perfect to me.
  • hellfire24
    i would take rampage iv formula.it's cheaper and provides similar features.who needs 4-way sli?
  • WR2
    Kind of a lukewarm recommendation. Just 'Tom's Hardware Approved award'
  • Crashman
    WR2Kind of a lukewarm recommendation. Just 'Tom's Hardware Approved award'Only because there aren't many readers who can get $50 of value out of its specific feature set, compared to the WS.
  • niknovacain
    Red and black looks sick.
  • halcyon
    I wish I hadn't seen this. I really do. I have no excuse to get an X79 based system. I don't. I..do...not. I want. ...but I can't. Food. Food is important.
  • master9716
    You guys really need to start Testing @ 5760x1080 !!! , Monitors go for really cheap on craiglist now from wholesellers , you can buy 3 24" leds for like 300 bucks so a lot of people that I know have been runing 3 monitor setups for a while.
  • jaquith
    Thanks Thomas for another enlightening Article! :)

    Just knowing the ASUS and EVGA from past history (LGA 1366) which may or may not play any role here, ASUS tends to (lets call it adjust) the CPU vCore and VTT/VCCSA higher than advertised vs EVGA which probably explains* the problems with both the high frequency RAM and CPU OC's.

    The disturbing thing to 'me' was the regulator voltages. I know the EVGA uses 12+2 vs ASUS's 8+3+(2+2) PWM and it's all digital controlled on ASUS, (*)but IDK if the EVGA is digitally controlled which might explain the inefficiency and OC.

    The EVGA has always been a very 'manual' MOBO, so in that regard I'm not surprised you had to dive into the BIOS. I have no doubts if you raised the EVGA's voltages vs a cloned ASUS optimized OC set that you'd have no problems obtaining the SAME 4.8GHz OC. Both boards offer voltage check points and I'd be very interesting how they compared.

    Just the other day I updated my ASUS BIOS and right-off I noticed an increased vCore increase by +0.01v~+0.015v and as part of the documented (improvements) was 'Improved Stability' ; yeah sure if you raise the vCore or VTT/VCCSA, phase, etc profiles... Now I have to redo my validations.

    The most important testing here, to me, is the Baseline Comparison which tells me EVGA has some work to do ASAP, and hopefully a BIOS update can close the gaps. Further, personally I won't buy or recommend any X79 MOBO unless it offers an 8xDIMM option. In the forum it's been very clear which X79's I recommend since day one, and the ASUS R4E has always been on top on my list if you can afford it! ;)
  • spookyman
    Considering Ivy Bridge is around the corner. Would it be beneficial in buying a Sandy Bridge-E board?