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Today we get a hands on with the latest Seasonic Prime PX-2200, a delayed review as we updated our hardware test suite in the background this year. Priced between £460 and £500 in the UK, this is not for the faint of heart. This unit has achieved Cybenetics Platinum certification and supports the ATX 3.1/PCIe 5.1 spec. It also ships with a 12-year warranty.
The Seasonic Prime PX-2200 is the company’s flagship 2200W power supply built from the ground up to meet ATX 3.1 and PCIe 5.1 standards, delivering headroom well beyond typical gaming rigs. With flagship-class efficiency and build quality, it’s engineered for high-end workstations, AI systems, multi-GPU setups, and pro workloads that demand sustained, clean power.
PX-2200 Features:
- High efficiency – 80 PLUS® Platinum EU 230 V Internally certified
- ATX 3 and 16-Pin PCIe Gen 5 Cable (12V-2×6)
- MTLR (Micro Tolerance Load Regulation) @ 1 %
- Premium Hybrid Fan Control – Fanless under 40 % system load
- Super low ripple noise (35 mV)
- High-end components and design
- Gold-plated high current terminals
- Highly reliable aluminum electrolytic solid capacitors
- Cable-free Connection Design: reduces production errors during manual insertion
- Protection features: OPP, OVP, UVP, OCP, OTP, SCP
- AC Input 200 – 240 Vac
- 12-year warranty – industry-leading
The Prime PX-2200 box is very shiny and difficult to photograph. Seasonic are proud to showcase the 12-year warranty. Understandably so, it's one of the best on the market today.
I gave up trying to get a good photo of the rear of the box.
The Seasonic bundle is extensive. They give you cable ties, a C19 power cable, literature on the product, a 90 degree adapter / PSU tester and some cable combs.
As you would expect with a 2200W power supply, there are enough cables to power a small nuclear station.
The Seasonic Prime PX-2200 is a good looking power supply, if rather large. It measures 210 mm x 150 mm x 86 mm (LxWxH). The 210mm length rules this out for use in smaller computer chassis.
A large fan is hidden behind the grille, we will take a closer look at this later in the review when we open it up.
The power side of the supply is home to a power connector socket, a power switch and ‘Hybrid mode' switch. When this switch is turned on the fan is disabled at lower power draw to reduce noise.
Seasonic supplies a C19 mains cable with the Prime PX-2200 rather than the more common C15 because of the sustained current levels this power supply is designed to handle. A C19 connector is rated for significantly higher continuous current and uses heavier-gauge conductors, reducing connector heating and voltage drop under prolonged high load. At power levels approaching 2 kW, this isn’t optional but necessary for electrical safety and long-term reliability.
Three simple rows of connectors, all labelled to make the installation process as easy as possible.
The Prime PX-2200 is capable of supplying up to 183.33 A on its single +12V rail, while the minor +3.3V and +5V rails are each rated for up to 25A.
Cooling duties are handled by a Hong Hua fluid dynamic bearing fan, model HA13525H12SF-Z. It operates at 12 V DC with a rated current of 0.50 A and has a maximum speed in the 2,300–2,500 rpm range.
We did not carry out a full internal teardown on this unit, as it was installed directly into one of our test systems for upcoming video content. That said, the underlying platform is Seasonic’s familiar high-end topology, using a bridgeless interleaved PFC design paired with a full-bridge LLC converter, synchronous rectification, and DC-DC conversion on the secondary side.
Internally, the Prime PX-2200 uses a double-length PCB and features a substantial primary-side filtering stage, including three X capacitors, six Y capacitors, two common-mode chokes, and a MOV. Bulk capacitance is provided by three high-grade Nippon Chemi-Con electrolytic capacitors, each rated at 420 V and 820 uF, for a combined total of 2,460 uF, which is exceptionally generous even by flagship standards.
Secondary-side filtering continues the premium theme, with capacitors sourced from Nippon Chemi-Con and Rubycon throughout. Overall build quality is excellent, with clean soldering and a well-organised internal layout. Large heatsinks are deployed across key components to ensure effective thermal management under sustained high-load operation.
In terms of protection, the Prime PX-2200 implements a comprehensive safety suite including OCP, OVP, UVP, SCP, OPP, OTP, SIP, and NLO, which is exactly what we would expect from a power supply operating at this level.
Correctly testing power supplies is a complex procedure and KitGuru have configured a test bench which can deliver up to a 2,500 Watt DC load. This has recently been upgraded to accommodate a higher power output.
We test ambient temperatures at 35C in our environment to greater reflect warmer internal chassis conditions.
We use combinations of the following hardware:
• SunMoon SM-268
• CSI3710A Programmable DC load (+3.3V and +5V outputs)
• CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
• Extech Power Analyzer
• Extech MultiMaster MM570 digital multimeter
• Extech digital sound level meter
• Digital oscilloscope (20M S/s with 12 Bit ADC)
• Variable Autotransformer, 1.4 KVA
|
DC Output Load Regulation
|
||||||||||
|
Combined DC Load |
+3.3V
|
+5V
|
+12V
|
+5VSB
|
-12V | |||||
|
A
|
V
|
A
|
V
|
A
|
V
|
A
|
V
|
A | V | |
|
500W
|
7.63
|
3.33
|
8.82
|
5.04
|
36.05
|
11.99
|
1.5
|
5.01
|
0.30 | -12.03 |
|
750W
|
12.63
|
3.33
|
14.12
|
5.04
|
52.06
|
11.99
|
2.0
|
5.00
|
0.30 | -12.02 |
|
1000W
|
17.75
|
3.33
|
20.00
|
5.03
|
72.25
|
11.99
|
2.5
|
5.01
|
0.50 | -12.03 |
| 1250W | 18.84 | 3.33 | 24.04 | 5.04 | 90.14 | 11.98 | 3.0 | 5.00 | 0.50 | -12.02 |
|
1500W
|
18.87
|
3.33
|
22.64
|
5.03
|
115.90
|
11.97
|
3.5
|
5.00
|
0.50 | -12.02 |
| 1600W | 10.00 | 3.33 | 10.00 | 5.03 | 125.00 | 11.97 | 3.5 | 5.00 | 0.50 | -12.02 |
| 2000W | 12.00 | 3.33 | 12.00 | 5.04 | 155.00 | 11.96 | 3.0 | 5.00 | 0.50 | -12.02 |
| 2200W | 12.00 | 3.33 | 12.00 | 5.03 | 173.00 | 11.95 | 3.0 | 5.00 | 0.50 | -12.03 |
Even when pushed to its full 2200W capacity, load regulation is impressive. Voltage stability across both the main and auxiliary rails remains tightly controlled, with only minor variation observed.
| Cross Load Testing | +3.3V | +5V | +12V | -12V | +5VSB | |||||
| A | V | A | V | A | V | A | V | A | V | |
| 1600W | 10.0 | 3.32 | 10.0 | 5.02 | 125.00 | 11.98 | 0.5 | -12.03 | 0.35 | 5.01 |
| 240W | 19.0 | 3.32 | 22.0 | 5.00 | 2.5 | 12.00 | 0.2 | -12.01 | 0.50 | 5.02 |
The Seasonic Prime PX-2200 handled our cross load tests without any issues. When hit with 125A, the +12V rail held at 11.98.
We then used an oscilloscope to measure AC ripple and noise present on the DC outputs. We set the oscilloscope time base to check for AC ripple at both high and low ends of the spectrum. ATX12V V2.2 specification for DC output ripple and noise is defined in the ATX 12V power supply design guide.
|
ATX12V Ver 2.2 Noise/Ripple Tolerance
|
|
|
Output
|
Ripple (mV p-p)
|
|
+3.3V
|
50
|
|
+5V
|
50
|
|
+12V1
|
120
|
|
+12V2
|
120
|
|
-12V
|
120
|
|
+5VSB
|
50
|
Obviously when measuring AC noise and ripple on the DC outputs the cleaner (less recorded) means we have a better end result. We measured this AC signal amplitude to see how closely the unit complied with the ATX standard.
| AC Ripple (mV p-p) | ||||
| DC Load | +3.3V | +5V | +12V | 5VSB |
| 500W | 15 | 14 | 25 | 26 |
| 750W | 17 | 15 | 27 | 27 |
| 1000W | 17 | 16 | 29 | 28 |
| 1250W | 18 | 17 | 33 | 30 |
| 1500W | 19 | 17 | 35 | 32 |
| 1600W | 20 | 18 | 37 | 33 |
| 2000W | 21 | 18 | 39 | 35 |
| 2200W | 21 | 19 | 42 | 36 |
Ripple suppression is solid overall, with both the primary and secondary rails remaining within accepted industry limits. While not class-leading, the results are entirely satisfactory.
|
Efficiency (%)
|
|
|
500W
|
92.27
|
|
750W
|
92.94
|
|
1000W
|
94.96
|
|
1250W
|
94.89
|
| 1500W | 94.37 |
| 1600W | 94.11 |
| 2000W | 92.25 |
| 2200W | 91.88 |
These efficiency results are top tier, and almost hit 95% at peak efficiency. At full load the efficiency drops to around 92%.
We take the issue of noise very seriously at KitGuru and this is why we have built a special home brew system as a reference point when we test noise levels of various components. Why do this? Well this means we can eliminate secondary noise pollution in the test room and concentrate on components we are testing. It also brings us slightly closer to industry standards, such as DIN 45635.
Today to test the power supply we have taken it into our acoustics room environment and have set our SkyTronic DSL 2 Digital Sound Level Meter (6-130dBa) one meter away from the unit. We have no other fans running so we can effectively measure just the noise from the unit itself.
As this can be a little confusing for people, here are various dBa ratings with real world situations to help describe the various levels.
KitGuru noise guide
10dBA – Normal Breathing/Rustling Leaves
20-25dBA – Whisper
30dBA – High Quality Computer fan
40dBA – A Bubbling Brook, or a Refrigerator
50dBA – Normal Conversation
60dBA – Laughter
70dBA – Vacuum Cleaner or Hairdryer
80dBA – City Traffic or a Garbage Disposal
90dBA – Motorcycle or Lawnmower
100dBA – MP3 Player at maximum output
110dBA – Orchestra
120dBA – Front row rock concert/Jet Engine
130dBA – Threshold of Pain
140dBA – Military Jet takeoff/Gunshot (close range)
160dBA – Instant Perforation of eardrum
|
Noise (dBA)
|
|
|
500W
|
<28.0
|
|
750W
|
<28.0
|
|
1000W
|
<28.0
|
|
1250W
|
<28.0
|
| 1500W | 33.7 |
| 1600W | 35.7 |
| 2000W | 41.1 |
| 2200W | 45.8 |
The fan in this unit is superb, but we have never seen it tasked with such a tough job before. At anything up to 1,500 watts it's very quiet, almost inaudible in real world situations. Once you hit a 1900 watt sustained load it becomes clearly audible, rising to almost 46 dBa at full load. Not a situation you would hope to be running on a regular basis mind you!
|
Temperature (c)
|
||
|
Intake
|
Exhaust
|
|
|
500W
|
36
|
39
|
|
750W
|
37
|
42
|
|
1000W
|
42
|
44
|
|
1250W
|
46
|
47
|
|
1500W
|
48
|
52
|
| 1600W | 51 | 56 |
| 2000W | 54 | 57 |
| 2200W | 54 | 60 |
This unit is highly efficient and the temperatures are really class-leading even when the load gets higher.
There is no question that the Seasonic Prime PX-2200 fully earns its flagship status. As Seasonic’s own top-tier design, the overall execution is exactly what we would expect from one of the most respected PSU manufacturers in the industry, with excellent build quality and robust power delivery throughout our testing.
Externally, construction quality is excellent. The power supply is physically large at 210mm in length and extremely heavy, reflecting the amount of hardware packed inside. Internally, everything aligns with Seasonic’s Prime pedigree. Three high-grade Nippon Chemi-Con 105°C capacitors handle the primary stage, delivering a combined 2,460 uF of bulk capacitance. Secondary-side components continue the premium theme, with capacitors sourced exclusively from Nippon Chemi-Con and Rubycon. Soldering quality and internal layout are exemplary.
The Prime PX-2200 employs a full-bridge LLC topology with synchronous rectification and DC-DC conversion, ensuring stable and efficient power delivery across the entire load range. Peak efficiency approached 95% in our testing, which is outstanding and among the strongest results we have recorded in the lab.
Cooling is handled by a high-grade Hong Hua fluid dynamic bearing fan. For the majority of operating conditions the unit remains impressively quiet, only becoming clearly audible once load levels exceed around 1,800 watts. At sustained operation near the full 2200 watt rating, fan noise does increase noticeably, though this is entirely expected given the thermal demands involved.
Realistically, very few users will ever need this level of power capacity. However, for high-end workstations, AI workloads, or multi-GPU systems pushing extreme 12V current demands, the Prime PX-2200 provides a rock-solid foundation. Seasonic positions this unit for professional workloads, AI computing, and next-generation enthusiast systems, and our results support that intent. So they say anyway, I don't personally know anyone who needs a 2200 watt power supply, but they are clearly out there!
At the time of writing, UK pricing at Scan sits at £469.99 (HERE). This is undeniably a significant investment, but when viewed in the context of the performance on offer, component quality, and the lengthy 12-year warranty, it represents a compelling option at the very top end of the PSU market.
If you genuinely need extreme power delivery with long-term reliability in mind, the Seasonic Prime PX-2200 comes highly recommended.
Pros:
- Exceptional efficiency levels.
- Outstanding power delivery.
- High-quality modular cabling.
- Excellent build quality throughout.
- Sustained 2200 W output capability.
- 105 °C-rated Japanese capacitors on both primary and secondary stages.
- Very high bulk capacitance (2,460 uF).
Cons:
- Expensive.
- Physically large at 210 mm.
- Ripple suppression is good, but not class-leading.
KitGuru says: The Seasonic Prime PX-2200 delivers outstanding build quality and power delivery. For high-end workstations or multi-GPU systems requiring massive 12V output, it is one of the strongest options currently available.
