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Supermicro C9X299-PG300 (Intel X299) Motherboard Review (Page 3)

By: Steven Bassiri from May 15, 2018 @ 10:00 CDT
TweakTown Rating: 94%Manufacturer: Supermicro

Circuit Analysis


Let's see what the motherboard is hiding under its heat sinks.


Check out this eight phase VRM, and look at that Infineon PWM controller. Infineon is the company that owns Primarion and International Rectifier (who bought CHiL's portfolio). We rarely see Infineon brand PWMs because of their price. It has to be an 8-phase PWM controller, and it's most likely digital at least as good as comparable IR or Primarion parts. The eight phases output to TDA21470 integrated power stages that have IR markings but use Infineon's naming scheme.

Infineon says that a five-phase VRM will maintain over 94% efficiency even outputting 225A at 1.83v (with a 12v VIN) at a 500kHz switching frequency. That's 411W (very rough estimate) with only five phases. So if we figure each phase can do 80W, then that's almost 640W here at over 94% efficiency. Although we are just scaling, and our estimates are not on track to be even close to 100%, that's still very impressive.


Looking around for VCCSA and VCCIO phases, we stumble upon a familiar sight; one PWM and one power stage. The VCCSA, VCCSA, and even both memory VRMs utilize 40A Infineon TDA21240 power stages, and Primarion PXE11110 digital PWM controllers. Although we don't know much about the Primarion PXE1110, we know there are four of them on the motherboard, and that they probably output to two separate rails.

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