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

Steven Bassiri | May 15, 2018 at 10:00 am CDT - 1 min, 12 secs reading time for this page
Rating: 94%Manufacturer: Supermicro

Circuit Analysis

Supermicro C9X299-PG300 (Intel X299) Motherboard Review 17 | TweakTown.com

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

Supermicro C9X299-PG300 (Intel X299) Motherboard Review 18 | TweakTown.comSupermicro C9X299-PG300 (Intel X299) Motherboard Review 19 | TweakTown.com

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.

Supermicro C9X299-PG300 (Intel X299) Motherboard Review 20 | TweakTown.comSupermicro C9X299-PG300 (Intel X299) Motherboard Review 21 | TweakTown.com

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.

Last updated: Nov 15, 2019 at 01:16 pm CST

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Steven Bassiri

ABOUT THE AUTHOR - Steven Bassiri

Steven went from a fledgling forum reader in 2003 to one of the internet's brightest tech stars by 2010. Armed with an information systems degree, a deep understanding of circuitry, and a passion for tech, Steven (handle Sin0822) enjoys sharing his deep knowledge with others. Steven details products down to the component level to highlight seldom explained, and often misunderstood architectures. Steven is also a highly decorated overclocker with several world records.

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