The Seasonic Prime TX-1600 Noctua Edition is a flagship 1,600W ATX 3.1 PSU that pairs the PSU firm’s established Prime TX platform with Noctua’s quieter cooling hardware and Cybenetics Titanium-class performance. It is built for very high-end systems, and the measurements here show that it combines outstanding electrical quality with exceptionally low noise.
Seasonic says it uses native 12V-2×6 connectors, advanced digital fan control, and 105°C-rated Japanese electrolytic capacitors, while the Noctua NF-A12x25 fan and the optimised grille are there to minimise noise.
Seasonic Prime TX-1600 Noctua Edition
£429 / €499
Pros
- Great efficiency
- ATX 3.1 and PCIe 5.1 support
- Superb voltage regulation
- Excellent noise characteristics
- Wonderful ripple suppression
- 12-year warranty
Cons
- 1,600W capacity overkill for most
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How we test and review products.
Seasonic Prime TX-1600 Noctua Edition fully supports ATX 3.1 and PCIe 5.1, ensuring compatibility with high-wattage components, such as the Nvidia GeForce RTX 4000/5000 series. This also means that the Seasonic x Noctua PSU uses the latest 12V-2×6 (ATX12VO) power connector, designed to deliver up to 600W of raw, unhindered power to the graphics card. You needn’t worry about the rather infamous 12VHPWR here.
When compared to ATX 2.X, which supports high load peaks but does not define a maximum above the nominal power of the power supply, ATX 3.1 represents clear target values – specifically, the PCIe connection for the graphics card must allow load changes of up to three times the power consumption. There is also a surge tolerance of up to 235%.
This PSU sits near the very top of the consumer PSU market, so expectations are naturally high. It is not just a high-wattage unit, but one designed to stay efficient, stable, and quiet under punishing loads. The Cybenetics data confirms that the platform is technically excellent, and the Noctua collaboration meaningfully improves acoustics.
It is the sort of PSU that makes sense when the rest of the system is equally no-compromise. Its positioning also makes clear that this is a product built for enthusiasts who value engineering polish as much as raw output. In that sense, it feels less like a standard component and more like a showcase piece for premium PC builds. A 12-year warranty is among the best in this segment, too.
Look and feel
The Seasonic product page rightfully presents the unit as a premium, fully-featured PSU with ATX 3.1 and PCIe 5.1 support, native 12V-2×6 connectivity, and a focus on silent operation.
Included with the power supply are:
- Zippered cable bag
- Power cable
- Set of plastic cable management clips
- Power supply tester that doubles as a 90-degree angle adapter
- fFve Velcro cable ties
- 12 plastic cable ties
- Four black screws for mounting the PSU
- Metal plaque
- User manual
Cabling
The modular cabling of Seasonic’s Prime TX-1600 Noctua Edition includes a full set of essential connectors, from a standard 24-pin ATX to multiple PCIe, SATA, and Molex connectors, making it versatile enough for a range of builds, from gaming rigs to workstations.
Individually braided cables are matched up to Noctua’s brown and black colour ways. Graphics support is impressive, with two PCIe 5.1 12V-2×6 600W and 6x PCIe 6+2 connectors for overclocked, high-end models. This variety of connectors not only supports multiple GPU configurations but also enables future expandability; a key consideration for users planning incremental upgrades. Below, you can find a list of the supplied cables:
• 1x 24-pin ATX cable (610mm)
• 3x 4+4-pin EPS cable (700mm)
• 6x 6+2-pin PCI-e cable
• 2x 12+4 PCIe (600 mm)
• 4x SATA cable 510+155+155+155mm)
• 2x SATA cable (410+160mm)
• Molex cable (460+125+125mm)
The power cable is 1,390 mm long and is C19-compatible (not C13). It’s capable of handling up to 15A (not 10A like C13). Seasonic uses cables with 16 AWG and 18 AWG (American Wire Gauge) cross-sections, where a lower number indicates a larger cross-section. Additionally, its thoughtful design ensures it can be comfortably accommodated even in smaller PC cases or builds with tight space constraints, enhancing its overall usability.
Detailed inspection
Seasonic highlights the Noctua fan and custom grille as core parts of the design rather than cosmetic extras. That framing aligns with the product class: this is a showcase power supply coming in at £429, not a value model. Dimensions are 150mm x 86mm x 210mm (W x H x D), and it weighs 3.2kg. These are rather typical for a PSU of this wattage – well, maybe the depth is above average. The fan is housed within a brown grille, redesigned by Noctua and optimised for the Noctua NF-A12x25, to ensure there’s enhanced airflow and better acoustic performance of the Seasonic Prime TX-1600 Noctua Edition.
The shape itself is interesting and original. The brown colour typical of Noctua products is very distinctive and, unfortunately, won’t be to everyone’s taste, but in person, the power supply looks good and is pleasing to my eye.
The heart of its cooling system is a 120mm Noctua fan identified as NF-A12x25 – High-Speed. It uses the preferred fluid-dynamic bearing (called SSO2). The maximum speed is ~2,400rpm.
The external modular connectors are clearly labelled to accelerate assembly and avoid confusion, which is a detail appreciated by both first-time builders and seasoned modders. A button on the rear of the power supply allows switching between a balanced active cooling mode, where the Noctua fan spins continuously, and a semi-passive mode, where the fan does not spin under low load and only starts when additional cooling is required for more demanding operations.
Internals
A massive heatsink connects to the parts of the power supply that need the most cooling and dissipates a large portion of the heat. Even though a Titanium efficiency power supply generates less heat than most, active cooling is required to prevent overheating under high-load conditions.
The OEM for this PSU is Seasonic, of course, which a manufacturer that shouldn’t need an introduction. As for the topology, it’s a bridgeless APFC + LLC resonant converter for the primary side. It features an advanced APFC (Active Power Factor Correction) controller, specifically using Texas Instruments UCD28070 paired with Champion CM6901T2X Resonant Controller, which actively reduces no-load consumption and optimises input power management. This combination ensures the wall power-draw remains minimal under all conditions, contributing directly to the unit’s stellar efficiency ratings.
As for the secondary side, you can find Synchronous Rectification for 12V & DC-DC converters for minor rails here. This stage is populated with premium electrolytic capacitors:
- Electrolytic: 5x Nippon Chemi-Con (105°C, W), 1x Nippon Chemi-Con (5-6,000h @ 105°C, KZH)
- 1x Nippon Chemi-Con (2-5,000h @ 105°C, KZE)
- 3x Rubycon (6-10,000h @ 105°C, ZLH)
- 1x Rubycon (3-6,000h @ 105°C, YXG)
- Polymer: 28x Nippon Chemi-Con, 2x FPCAP, 8x Evercon
Synchronous rectification is standard, using top-tier MOSFETs that handle extreme loads without significant heat or inefficiency. A wire-free design inside the unit removes many airflow impediments, boosting long-term reliability and keeping all vital circuits at cool operational thresholds. The Supervisor IC is Weltrend WT7527RA (OCP, OVP, UVP, SCP, PG), and the +12V Mosfets are 16x Nexperia PSMN1R0-40YLD (40V, 198A @ 100°C, Rds(on): 1.93mOhm).
Performance and efficiency
My first basic test is performed with a power-supply tester. It doesn’t draw more than a couple of watts from the PSU, but it helps determine whether the unit is operational. A self-check indicates whether the voltages are at the proper levels.
As you can see, there are no issues with the Seasonic Prime TX-1600 Noctua Edition unit.
The following professional setup was used for the remainder of the testing:
- Voltcraft VC-870 Digital Multimeter – voltage measurement (+ Fluke 97 scope meter)
- Oscilloscope – GW INSTEK GDS 3154
- DC load – original solution
- Fluke 97 Scope meter (a measurement of voltage and ripple)
- Voltcraft SL-451 decibel meter (volume measurement)
- ACUVIM-IIRF is used to measure active power (input from the socket)
- PCE Instruments PCE-DT 50 tachometer – for the measurement of the rotational speed of the fan
Measurements are taken only at 230V input.
I’ll give you the TLDR first. Seasonic Prime TX-1600 Noctua Edition easily meets 80 Plus Titanium certification, delivering great efficiency that keeps power waste and heat generation in check. There is a higher certification, known as 80 Plus Ruby, but those PSUs are typically reserved for AI-optimised servers. This is therefore about as good as it gets for the consumer crowd.
Under typical loads, the PSU consistently maintains very high efficiency, ranking among the best in its class. This high efficiency directly translates into lower electricity bills for users running their systems extensively, as well as a reduced environmental impact.
Given its ATX12VO support, the Seasonic Prime TX-1600 Noctua Edition houses a 12V rail capable of delivering 133A in total, for a 1,600W power output. Should you need to use 5V and 3.3V, there’s 25A available on each, though not concurrently, of course.
12V regulation
| Wattage | Seasonic Prime TX-1600 Noctua Edition |
|---|---|
| 160W (10%) | 12.02V |
| 400W (25%) | 12.02V |
| 800W (50%) | 12.01V |
| 1,200W (75%) | 12.00V |
| 1,600W (100%) | 12.00V |
Voltage remains consistent across the load spectrum, with minimal deviation from the ideal 12V rail, providing stable power to sensitive components even at full load. This stability is crucial because voltage fluctuations can cause system crashes or hardware damage, especially in high-performance components like CPUs and GPUs.
Wide-load efficiency
| Wattage | Seasonic Prime TX-1600 Noctua Edition |
|---|---|
| 160W (10%) | 91.96 per cent |
| 400W (25%) | 95.23 per cent |
| 800W (50%) | 95.46 per cent |
| 1,200W (75%) | 94.72 per cent |
| 1,600W (100%) | 93.67 per cent |
80 Plus Titanium PSUs are amongst the best of the best. Seasonic Prime TX-1600 Noctua Edition is comfortably above 90% efficiency at workloads common on consumer PCs.
Low-load efficiency
| Wattage | Seasonic Prime TX-1600 Noctua Edition |
|---|---|
| 40W | 76.95 per cent |
| 60W | 83.25 per cent |
| 80W | 86.25 per cent |
Examining low-load efficiency is equally important if, like us, your PC spends much of its time idling. The wide-load efficiency range, however, ensures that whether your system is running basic tasks or pushing full CPU and GPU performance, the PSU operates economically, minimising heat output and potentially extending the lifespan of your computer’s components.
As you can see, the Seasonic Prime TX-1600 Noctua Edition results are not spectacular, but with that high wattage, it’s definitely more difficult to achieve great results at very low loads, which represent a small percentage of total capacity. 40W, for example, is merely 2.5% of the total long-term power.
12V ripple suppression
| Wattage | Seasonic Prime TX-1600 Noctua Edition |
|---|---|
| 160W (10%) | 15.2mV |
| 400W (25%) | 10.3mV |
| 800W (50%) | 9.5mV |
| 1,200W (75%) | 9.9mV |
| 1,600W (100%) | 16.8mV |
Ripple suppression reflects high-quality AC-to-DC conversion. The Seasonic Prime TX-1600 Noctua Edition delivers consistently very low ripple voltage across its operating range, ensuring stable, error-free operation for high-end processors and graphics cards.
Reduced ripple contributes to the better long-term health of your PC parts, too, and it can even lead to slightly improved overclocking headroom because the delivered power is consistent and largely free of electrical noise.
Noise
| Wattage | Seasonic Prime TX-1600 Noctua Edition |
|---|---|
| 160W (10%) | 30.0 dBA (0 pm) |
| 400W (25%) | 30.0 dBA (0rpm) |
| 800W (50%) | 30.0 dBA (544rpm) |
| 1,200W (75%) | 31.5 dBA (753rpm) |
| 1,600W (100%) | 33.9 dBA (1,398rpm) |
These are terrific results. Seasonic Prime TX-1600 Noctua Edition is passive up to 40% load (640W), with the fan turning on at around 45% (720W). Even with 75% (1,200W), mind you, it’s barely spinning, and that figure is large enough to power a monster overclocked system full of the very best components possible. The 120mm fan’s intelligent control keeps noise to a minimum, with the PSU practically silent across low-to-moderate workloads.
Even under heavy loads, the noise output remains subdued, making it an excellent choice for quiet PC builds. This cooling efficiency means the PSU can maintain stable operation without resorting to aggressive fan speeds, which often cause distracting noise spikes in less well-designed units.
Background noise in my lab is 30dBA, so even under full load, I can barely hear the fan, which spins at around 800rpm at anything other than 100% load.
Conclusion
The Seasonic Prime TX-1600 Noctua Edition is a top-shelf PSU that excels at three things: efficiency, electrical quality, and low noise. Cybenetics Titanium and A++ are the right badges for a product of this type, and the internal design supports those ratings with a serious high-end topology. Its comprehensive ripple compensation, superb voltage regulation, and a solid set of protection circuits reaffirm its place among the highest-calibre PSUs on the market. It comes with a rather high price, mind you, but that’s to be expected for a top-notch design.
It stands out not only for its power but also for the level of refinement it delivers, which is a quality many competing units do not match. For builders who need this much capacity, the combination of premium acoustics and top-tier electrical performance makes it an easy recommendation. Its 80 Plus Titanium efficiency rating ensures low energy waste, while the sturdy build and robust protection give both gamers and professionals peace of mind.
The Seasonic Prime TX-1600 Noctua Edition uses semi-passive cooling: the 120mm fan only starts at around 45% load, and even then it’s barely noticeable over background noise, spinning at ~500rpm. The average efficiency in the 20–100% range is over 94.5%, and the maximum efficiency is 95.46% at 50% load. Impressive numbers.
This is the sort of PSU that makes sense when the rest of the system is equally stacked. Think Ryzen 9 9950X3D2, 128GB RAM, 10TB+ SSDs, and RTX 5090, all placed in a top-notch chassis. This PSU exemplifies the saying that you get what you pay for.
