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ASUS ROG Rampage VI Extreme Motherboard Review (Page 3)

By: Steven Bassiri from Oct 11, 2017 @ 16:16 CDT
TweakTown Rating: 93%Manufacturer: ASUS

Circuit Analysis


The Rampage VI Extreme hides a lot under the shields.


The CPU VRM gets a true eight phase setup, and it utilizes micro-fine alloy chokes and 10K gunmetal solid polymer capacitors. Each phase gets a PWM channel from an ASP1405, which is ASUS's custom stamped IR controller similar to an IR35201 fully digital PWM. Each phase uses an IR3555 fully integrated 60A power stage. The VRm here is excellent, even for 18 core CPUs.


Two Digi+ ASP1250 PWM controllers are used instead of the ASP1103 PWM controllers we saw on the X299 Deluxe. It might be possible that these are digital PWMs. Each of the PWMs outputs to two Texas Instruments CSD97374 NexFET power stages rated peak of 60A but continuous at 25A.


The VCCSA and VCCIO get their power from a Digi+ ASP1405 (which seems like overkill), and they use the same 25/60A NexFETs we saw used for the memory. There are also other minor VRMs located around the CPU socket, and we find extra voltages in the BIOS such as an "Uncore" voltage even though there is already a cache voltage, perhaps that is from external circuitry and not the FIVR.

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