Antec Signature 2200W PSU Review (2025)

1. Introduction2. Bundle & Cabling3. External4. Internal5. Testing Methodology and Results6. Closing Thoughts7. View All Pages

Today we look at a new flagship power supply from Antec –  a unit so important Antec call it their ‘Signature'. This 2,200 watt behemoth is going to hit the UK market in a few weeks priced at £449.99, offering Cybenetics Titanium certification and support for the ATX 3.1/PCIe5.1 spec. It also ships with a full 12-year warranty.

Antec literature on the product is keen to highlight the adoption of 105C-rated Japanese capacitors inside. While 2200 watts is a little much for gamers today, Antec say it is designed for workstations, ‘professional workloads' and ‘AI and EDGE computing'. Everyone seems to focus on AI today of course, so that's always going to be a key selling point. Perhaps if you are running multiple RTX 5090 graphics cards, it is also a solid option for consideration.

The OEM for this power supply is Seasonic, based on their Prime PX-2200 ATX 3 unit released earlier this year.

Antec Signature 2200W Features:

• 80 Plus Platinum.
• Cybenetics Titanium (230v).
• ATX 3.1 and PCIe 5.1 Ready.
• 135mm Fluid Dynamic Bearing Fan.
• 12 Year Warranty Support.
• High End Components and Design.
• Highly Reliable aluminium electrolytic solid capacitors.
• Protection features: OPP, OVP, UVP, OCP, OTP, SCP.
• Fully Modular.

We got an early sample of this power supply from Antec HQ, and the box artwork was not finished when it shipped. The box weighs around 4.5kg. Yes, it's a hefty unit.

A couple of days after receiving our test sample Antec did send us the image above of the new packaging the customer can expect to see. Very nice and very ‘Seasonic PRIME like' which makes sense, as they are the OEM partner. It is good to see Antec putting a lot of effort into highlight the superior Cybenetics certifications as well on the box artwork.

The cables are all high quality and individually sleeved, offering reassuring quality for a power supply at this hefty asking price. Cables are all between 16-18AWG. The 12+4 Pin PCIe (600w) cables are 16-24AWG, and there are two of them.

As you would expect with a flagship 2200 watt power supply there are no shortage of power cables to cover every eventuality.

The Antec Signature 2200W power supply is well put together and rather large, measuring 210mm x 150 mm x 86 mm (LxWxH). The 210mm length is better suited to larger chassis designs on the market.

There are some key design changes from the Seasonic Prime part this unit is based around. Antec have opted for a more simple black aesthetic rather than the silver/chrome accenting of the Seasonic part. The top metal grille, however, is identical in regards to shape and style. It offers plenty of airflow.

One side of the unit is home to the power connector, power switch and ‘Hybrid mode' switch. When this switch is enabled it will turn the fan off at lower power draw, ensuring low noise output.

The modular bay on the other side of the unit is split into 3 rows and all labelled in sections to make it easy.

The power supply can deliver a staggering 183.33A to the primary +12V rail. The secondary +3.3V and +5V rails can output 25A.

This power supply has a Hong Hua fluid dynamic bearing (FDB) fan inside, model HA13525H12SF-Z, rated 0.50A 12VDC. Max speed is rated between 2,300 rpm and 2,500 rpm.

We didn't do a complete strip down on this unit, as it was moved internally into one of our test rigs for upcoming video content. This is a bridgeless interleaved PFC, full bridge & LLC converter with Synchronous Rectification and DC-DC converters on the secondary side.

We can, however, see this is basically a rebadged Seasonic Prime PX-2200 design. This is a double-sized PCB and it has 3x X caps, 6x Y caps, 2x CM Chokes and 1x MOV on the primary side. There are three high grade Nippon Chemi Con 105C-rated capacitors on the primary side rated 420V, 820uF each for a combined 2,460uF which is staggering.

The filtering capacitors throughout are from the two big Japanese players, Nippon Chemi Con and Rubycon. The overall build and soldering quality is superb throughout. Several large heatsinks ensure good cooling proficiency across the board.

The unit ships with OCP, OVP, UVP, SCP, OPP, OTP, SIP and NLO protections.

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	12.00	1.5	5.01	0.30	-12.03
750W	12.63	3.33	14.12	5.04	52.06	12.00	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	5.03	90.14	11.98	3.0	5.00	0.50	-12.01
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	5.04	125.00	11.97	3.5	5.00	0.50	-12.03
2000W	12.00	3.33	12.00	5.04	155.00	11.97	3.0	5.00	0.50	-12.02
2200W	12.00	3.33	12.00	5.04	173.00	11.97	3.0	5.00	0.50	-12.03

Load regulation is very good, even when delivering the full 2200 watts of power. Both primary and secondary rails hold well within specification with little fluctuation at all.

Cross Load Testing	+3.3V		+5V		+12V		-12V		+5VSB
	A	V	A	V	A	V	A	V	A	V
1600W	10.0	3.33	10.0	5.03	125.00	11.97	0.5	-12.02	0.35	5.01
240W	19.0	3.33	22.0	5.01	2.5	12.00	0.2	-12.02	0.50	5.00

The Antec Signature 2200W handled our cross load tests without any issues. When hit with 125A, the +12V rail held at 11.97.

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	20	18	35	28
750W	20	18	38	29
1000W	21	18	40	29
1250W	21	19	40	30
1500W	21	19	40	31
1600W	22	20	43	32
2000W	23	20	43	33
2200W	23	21	44	33

This unit passes our ripple suppression tests without any concerns and they fall within industry rated parameters. Both secondary rails peak close to 20mW under full load, and the +12V rail hits close to 40mV at full load. Strong results overall. Ripple suppression is pretty good and both primary and secondary rails fall within industry rated parameters. Not the greatest results we have seen, but all perfectly fine.

Efficiency (%)
500W	92.22
750W	92.91
1000W	94.88
1250W	94.86
1500W	94.41
1600W	94.25
2000W	92.23
2200W	91.94

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 its 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	38
750W	37	41
1000W	42	44
1250W	46	48
1500W	48	53
1600W	51	55
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 doubt that this 2,200 Watt PSU is worthy of being called a ‘Signature' power supply. As the review has already detailed, this is a Seasonic OEM part and the quality of finish and power delivery is superb.

The quality of the construction on the outside is excellent – the power supply is massive (210mm long) and very heavy, being almost identical to the original Seasonic design the unit is based around. When we get a look inside, the unit ticks all the boxes we would expect. Three high grade Nippon Chemi Con 105C-rated capacitors handle the primary stage to deliver a combined, staggering 2,460uF. Other capacitors in the unit are from Nippon Chemi Con and Rubycon, so the quality remains consistent throughout. Soldering quality is high as well.

A high-grade Full Bridge LLC architecture with synchronous rectification and DC-DC topology ensure that power remains consistent and efficient across the full load range. We measured close to 95% peak efficiency which is exceptional and one of the best results we have seen in our labs.

The Signature 2200W incorporates a high grade Hong Hua fluid dynamic bearing fan that delivers great results. At most loads, it is barely audible, and only when load exceeds around 1,800 watts does the fan make its presence known. You wouldn't want to be running this unit at 2,200 watts for long as the fan is clearly having to work hard and noise becomes a little intrusive.

All in all, if you have £450 to spare then this PSU deserves some serious consideration. Most of us will never need this kind of power to be honest, but I guess if you have multiple RTX 5090s to power a plethora of monitors it would make a good foundation for a workstation-style system. Seasonic have claimed that this unit is primarily aimed at ‘engineering for AI computing, professional workloads, and next generation PC enthusiasts.'

As we publish this review, stock is said to arrive in the UK sometime in December. We have European and UK pricing of €519 and £449.99 respectively, but we can confirm this is accurate when etailers start listing stock.

I would highly recommend this unit if you have need of insane amounts of power delivery – with the 12-year warranty, you get plenty peace of mind for the future.

Pros:

• Titanium levels of efficiency. Flagship power delivery.
• Quality cabling.
• Built like a tank.
• Fully modular.
• Delivered a sustained 2,200 watts of power.
• 105C highly rated Japanese capacitors in both primary and secondary stages.
• Staggering 2,460uf output.

Cons:

• It's not cheap.
• It's physically large (210mm long).
• Ripple suppression could be better.

KitGuru says: The Antec Signature 2200W is an exceptional power supply. if you have a high-end PC with multiple graphics cards or are building a new workstation and need huge amounts of 12V Amps then this should be right at the top of your shortlist.

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