The Corsair HX1200i is a high-performance ATX v3.1 and PCIe 5.1-compatible power supply designed for high-end systems with power-hungry components. Reason enough for me to once again let my friend Aris from Hardwarebusters have his say (and picture) on our site, as he has not only tested this power supply intensively, but has also officially certified it through his company Cybenetics. As it will certainly be of interest to you, I am happy to offer him the platform to share his findings with you here 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.
The Corsair HXi series has three members with 1500W, 1200W and 1000W maximum power. In today’s review, I will be evaluating the mid-range model, which is powerful enough to power a high-end system with an NVIDIA RTX 5090 and an AMD 9950X3D processor.
With prices starting at around €267, the HX1200i is anything but affordable, so I’m expecting a lot from it to justify the high price tag. According to Corsair, this unit is ready for NVIDIA’s 50-series, which means it supports NVIDIA’s latest GPUs, including the super-expensive GeForce RTX 5090. The unit is certified Platinum in efficiency by Cybenetics and has a Cybenetics A noise rating, which means it operates quietly despite its high capacity. High maximum performance and quiet operation don’t usually go hand in hand unless the platform is highly efficient and has a large enough PCB to accommodate large heat sinks. A carefully tuned fan speed profile is also required. Finally, I must mention that this unit is manufactured by Channel Well Technology under the strict supervision of the Corsair engineering team.
| Manufacturer (OEM): | CWT |
| Max Power: | 1200 W |
| Cybenetics Efficiency: | Cybenetics Efficiency: [115V] Cybenetics Platinum (89.650%), [230V] Cybenetics Platinum (91.473%) |
| 80 Plus Efficiency: | n.a. |
| Noise: | Noise: Cybenetics A (15-20 dB[A]) |
| Compliance: | ATX v3.1, EPS 2.92 |
| Alternative Low Power Mode support: | Yes |
| Operating Temperature: | (Continuous Full Load): 0 – 50 °C |
| Power 12V (Combined): | 1200 W on one single rail |
| Power 5V 3.3v: | 150 W |
| Power 5VSB: | 15 W |
| Cooling: | Cooling: 140mm Fluid Dynamic Bearing Fan (NR140HP) |
| Semi-Passive Operation: | ✓ (selectable) |
| Modular Design: | Yes (Fully) |
| High Power Connectors: | 2x EPS (2x cables), 5x PCIe 6 2 pin (5x cables), 1x PCIe 12 2 pin (600W) |
| Peripheral Connectors: | 8x SATA (2x cables), 6x 4-pin Molex (2x cables) |
| Cable Length: | ATX Cable Length: 610 mm EPS Cable Length: 650 mm 12 4 pin PCIe Cable Length: 650 mm 6 2 pin PCIe Cable Length: 650 mm |
| Distance between SATA/Molex connectors: | 110/100 mm |
| In-cable capacitors: | No |
| Dimensions (W x H x D): | 150 mm x 85 mm x 140 mm |
| Weight: | |
| Warranty: | 7 years |
Power Specifications
| Rail | 3.3V | 5V | 12V | 5VSB | -12V | |
| Max. Power | Amps | 25 | 25 | 100 | 3 | 0.3 |
| Watts | 150 | 1200 | 15 | 3.6 | ||
| Total Max. Power (W) | ||||||
Corsair HXi Series 2025 HX1200i 1200W ATX 3.1 (CP-9020307-EU)
 | Lagernd im Außenlager, Lieferung 2-3 WerktageStand: 23.12.25 07:29 | 249,89 €*Stand: 23.12.25 07:30 |
 | Auf Lager, 1 Werktag | 257,01 €*Stand: 23.12.25 06:42 |
 | Sofort lieferbar, Lieferzeit max. 1-3 Werktage | 263,00 €*Stand: 23.12.25 07:22 |
- 1 - Introduction, Overview and Specifications
- 2 - Unboxing, cables and protection circuits
- 3 - Teardown: topology, components, workmanship
- 4 - Load Regulation, Ripple Suppression
- 5 - Transient Response
- 6 - Hold-Up Time, Timings, Inrush-Current
- 7 - Average Efficiency and PF
- 8 - Operating noise and fans
- 9 - Summary and conclusion
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