Asus Rog Strix 1200W Platinum ATX v3.1 test: Are price and performance right?

1 - Introduction, Overview, and Specifications 2 - Unboxing, Cables, and Protection Features 3 - Teardown: topology, components and craftmanship 4 - Load Regulation, Ripple Suppression 5 - Transient Response 6 - Hold-Up Time, Timings, Inrush-Current 7 - Average Efficiency and PF 8 - Noise and fan control 9 - Summary and conclusion

The Asus Rog Strix 1200P GAMING is a high-end power supply with platinum certification that aims to compete on par with the Corsair HX1200i in both performance and price. The OEM behind this model is Great Wall, one of China’s largest PSU manufacturers with almost unlimited resources. It will be interesting to see how this PSU compares to other popular products in this category. Reason enough for me to once again let my friend Aris from Hardwarebusters have his say (and picture) on this on our site, as he has not only intensively tested this power supply, which costs around 160 euros, but has also officially certified it through his company Cybenetics. As this will certainly be of interest to you, I am happy to offer him the platform to share his findings with you on a case-by-case basis. And don’t forget, his website and YouTube channel also offer real gems in terms of really well-founded reviews! The power supply is also featured in his article on the best ATX v3.x & PCIe 5.x power supplies.

Asus has recently started working with Great Wall, one of the largest Chinese OEMs. Since this manufacturer is owned by the Chinese government, they have enormous resources at their disposal. I expect a lot from the Rog Strix 1200P, which aims to compete with the Corsair HX1200i. It’s an ATX v3.1 PSU with a 12 4-pin connector that can deliver a maximum of 600W – enough for any current GPU and the upcoming NVIDIA RTX 5090. A 1200W PSU may be overkill for most users, but anyone with a system with a high-end CPU and the budget for a high-end GPU will have all their power needs covered and plenty of headroom for future upgrades. No one can predict what the future holds, as the power consumption of GPUs increases with each new generation. This is of course good news for power supply manufacturers. However, the fact remains that electricity is extremely expensive in regions like Europe and we also need to minimize our carbon footprint – power-hungry IT components are not helping.

Like the ROG Strix 1000P I reviewed some time ago, this model also uses GaN MODFETs instead of MOSFETs in the power supply’s APFC converter to reduce energy losses and increase efficiency. However, the use of these FETs alone does not necessarily increase efficiency – a suitable design with an appropriate controller is required for this. I found that Great Wall uses a simple Champion CM6502UHHX to control the APFC converter. To fully utilize GaN FETs, a totem-pole PFC converter would need to be used, which can achieve up to 99% efficiency, compared to the 96% of the most advanced conventional APFC designs. However, this requires a compatible controller. I am therefore unsure whether the Champion controller can make optimum use of the GaN FETs; the test results will show this.

Nevertheless, I will say a few words first to show how a power supply can take full advantage of GaN FETs (gallium nitride FETs). To illustrate this, I present a schematic of this power supply, together with a schematic of a “conventional” power supply for comparison.

Modern conventional design with MOSFETS	New design with GaN MODFETs

Comparison: Conventional modern design vs. design with GaN MODFETs

The main changes made possible by the use of GaN MODFETs are as follows:

1. PFC stage (Power Factor Correction)

• Totem pole topology: The use of GaN components reduces the number of active power switches (FETs) and filter inductances by 50%.
• Increased switching frequency: The switching frequency can increase tenfold, which drastically reduces the size of the magnetic components and at the same time increases efficiency to over 99% (compared to 96% for today’s power supplies with Titanium certification).
  The result is a more compact design with significantly improved energy efficiency.

2. LLC resonant converter (DC/DC stage)

• Improved switching properties of GaN: These make it possible to increase the switching frequencies of the resonant converter to over 1 MHz.
• Advantages: Smaller transformers, higher power density and increased efficiency.
  As a result, power supply units with GaN components can have extremely compact dimensions without compromising on performance.

3. Point-of-Load (PoL) DC/DC converter

• One-step conversion: GaN enables direct voltage conversion from 36-60V to the supply voltage of the PC components, which reduces the number of components required and enables power supplies with smaller dimensions.
• Compact dimensions: Thanks to the smaller footprint of GaN-based solutions, engineers can stack power stages for different load requirements and place them closer to the load. This results in a faster and better response to load transients.

Design implications:

• Elimination of multiple voltage rails (12V, 5V, 3.3V): instead of the two-stage conversion common today, individual components can use their own DC/DC converters to generate all the required voltages from a single output voltage.
• Compatibility with higher voltages: Modern components can use GaN technology to generate the required voltages from a single high-voltage rail without causing additional losses.
  This reduces component requirements and enables more compact housings.

Challenges:

For such a paradigm shift to become a reality, manufacturers of GPUs, motherboards and other components must work closely with PSU designers. A similar approach was attempted with the Intel ATX v12VO specification, but this has so far found little acceptance. In this standard, the PSU only outputs 12V and 12VSB, while the components themselves are responsible for adjusting the voltages. With GaN FETs, the required DC-DC converter circuits could be so small that they hardly affect the form factors of the components.

I find these developments extremely exciting as they have the potential to revolutionize the efficiency and compactness of power supplies. The introduction of GaN technology could also help to optimize the energy consumption of IT systems, which is particularly important in regions with high electricity costs and a focus on sustainability.

Call up Cybenetics test report

Power Specifications

ASUS ROG Strix, ROG-STRIX-1200P Platinum, ROG-STRIX-1200P-GAMING, 1200W ATX 3.1 (90YE00W0-B0NA00)

	Auf Lager, 1 Werktag	212,07 €*Stand: 23.12.25 06:42
	Bestellt: auf Lager erwartet 07-01-2026	215,92 €*Stand: 23.12.25 06:03
	Sofort lieferbar, Lieferzeit max. 1-3 Werktage	243,00 €*Stand: 23.12.25 07:22

*Alle Preise inkl. gesetzl. MwSt zzgl. Versandkosten und ggf. Nachnahmegebühren, wenn nicht anders beschriebenmit freundlicher Unterstützung von geizhals.de