What Is the Noctua NL-LC1?

The Noctua NL-LC1 is Noctua's first all-in-one liquid CPU cooler family. Instead of developing an entirely proprietary liquid-cooling platform, Noctua partnered with Asetek and built the NL-LC1 around the premium Emma V2 platform.

What makes the NL-LC1 different is everything Noctua adds around that platform: a custom pump noise absorber, its latest G2-series fans, acoustic tuning, SecuFirm2+ mounting and Noctua's focus on long-term reliability.

The family currently consists of:

• NL-LC1-24 — 240mm radiator
• NL-LC1-36 — 360mm radiator
• NL-LC1-42 — 420mm radiator

All three use the same fundamental Emma V2 pump platform, while fan size and radiator capacity change between models.

NL-LC1 at a Glance

The Pump: Asetek Emma V2 + Noctua Engineering

One important clarification: the NL-LC1 does not use a completely custom Noctua-developed pump mechanism.

The underlying pump platform comes from Asetek's Emma V2 system. Noctua's major contribution is the acoustic engineering surrounding the pump and the way the pump is controlled.

The Emma V2 pump uses a three-phase motor and closed centrifugal impeller, with a ceramic sleeve and shaft bearing. It can operate from roughly 750 RPM to 3400 RPM, depending on the selected mode and PWM control.

Asetek's Emma V2 platform is designed to improve efficiency and flow compared with its predecessor. KitGuru reports Asetek's claimed improvements as 58% higher flow rate, 124% higher head pressure and 40% lower energy consumption versus the previous generation.

Pump Operating Modes

The NL-LC1 provides three pump profiles:

Quiet Mode

• Maximum: 2100 RPM
• Designed for minimum pump noise
• Best suited to users prioritizing acoustics

Balanced Mode

• Maximum: 2600 RPM
• Provides additional cooling headroom

Manual Mode

• Up to approximately 3400 RPM
• Gives the user maximum control through PWM

Noctua also specifies maximum pump acoustic levels of under 5 dB(A) in Quiet mode, 7.8 dB(A) in Balanced mode and 14.9 dB(A) in Manual mode for the pump itself.

The NL-PNA1: Noctua's Secret Weapon

The most interesting part of the NL-LC1 isn't actually the pump itself.

It's the NL-PNA1 pump noise absorber.

Noctua designed this component specifically to address one of the biggest problems with AIO liquid coolers: pump noise and vibration.

The NL-PNA1 uses two complementary techniques:

1. Three-layer acoustic soundproofing
2. Tuned-mass damping

The three-layer structure combines different acoustic materials to target different frequency ranges, while the tuned-mass design helps reduce structure-borne vibrations.

This is important because lowering the measured dB level isn't the whole story. A constant high-frequency whine or periodic vibration can be more annoying than a slightly louder but smoother sound.

Noctua therefore focuses on the character of the sound, not simply its volume.

How the NL-PNA1 Works

The absorber contains three acoustic layers.

Layer 1 — Open-Pore Foam

The first soft layer is designed to absorb higher-frequency pump noise.

Layer 2 — Dense Mass Barrier

The middle layer acts as a mass barrier that blocks and reflects lower-frequency sound.

Layer 3 — Secondary Absorption

The final open-pore layer helps absorb noise that makes it through the first layers.

Together, these layers address airborne sound while the tuned-mass component tackles vibration transmitted through the pump structure.

Next-Generation Fans: NF-A12x25 G2

The second major component of the NL-LC1's design is Noctua's NF-A12x25 G2 fan.

The 240mm and 360mm versions use the 120mm NF-A12x25 G2, while the 420mm model uses three NF-A14x25 G2 fans.

For the NF-A12x25 G2:

• Speed: 0–1800 RPM
• Maximum airflow: 107.3 m³/h / 63.15 CFM
• Maximum noise: 22.5 dB(A)
• Static pressure: 3.14 mm H₂O
• Size: 120 × 120 × 25mm

These aren't ordinary fans thrown onto a radiator. Noctua specifically tunes the supplied fans for radiator use and acoustic performance.

The 50 RPM Speed Offset

One of the cleverest acoustic details is the speed offset between adjacent fans.

On the NL-LC1-36, the three fans use a:

PPA / PPB / PPA

configuration.

The center fan runs approximately 50 RPM faster than the surrounding fans.

Why?

When identical fans run next to one another at exactly the same speed, their acoustic output can interact and create undesirable periodic tones or beat-frequency effects.

The small speed offset prevents those fans from continuously reinforcing the same acoustic pattern.

This is a small engineering detail, but it's one of the reasons the NL-LC1 has such a distinctive acoustic profile.

NF-A14x25 G2: The 420mm Version

The flagship NL-LC1-42 uses three NF-A14x25 G2 fans.

Each fan provides:

• 1500 RPM maximum speed
• 155.6 m³/h / 91.58 CFM airflow
• 24.8 dB(A) maximum noise
• 2.56 mm H₂O static pressure
• 140 × 140 × 25mm size

The larger 420mm radiator gives the NL-LC1-42 additional thermal headroom for high-heat CPUs.

Acoustic Performance

This is where the NL-LC1 really separates itself.

In KitGuru's testing, the NL-LC1-36 reached just 41 dBA at maximum fan speed, making it the quietest cooler in that particular comparison. KitGuru also described the sound as smooth and unobtrusive, with no prominent sharp tones from the fans.

Tom's Hardware similarly characterized the NL-LC1-36 as exceptionally quiet and highlighted its combination of strong thermal performance and acoustic refinement.

Another review measured the NL-LC1-36 at 41.5 dB(A) under its test conditions, reinforcing the cooler's strong acoustic performance.

Why Does It Sound Different?

The acoustic strategy is effectively a three-part system:

Pump → NL-PNA1 absorber → G2 fans + speed offset

Instead of relying on one trick, Noctua attacks several sources of noise simultaneously.

Thermal Performance

Despite the enormous emphasis on silence, the NL-LC1 isn't simply a quiet cooler.

It is also a serious high-end AIO.

KitGuru tested the NL-LC1-36 with a Ryzen 9 9950X using a 5.2 GHz / 1.3 V manual overclock and a 30-minute Cinebench R23 loop.

KitGuru Results

These are delta-over-ambient measurements, not absolute CPU temperatures. That's important because a cooler tested at 20°C ambient cannot be directly compared with a cooler tested at 25–30°C ambient using raw CPU temperature.

KitGuru described the NL-LC1-36 as consistently sitting in the upper tier of its liquid-cooler results.

40 dBA Noise-Normalized Performance

One of the most interesting measurements is what happens when the coolers are restricted to the same noise level.

At 40 dBA, the NL-LC1-36 recorded 62°C over ambient in KitGuru's testing.

This demonstrates the cooler's main philosophy:

Don't simply chase maximum thermal performance. Optimize the relationship between temperature and noise.

That is arguably where Noctua's engineering expertise is most visible.

Radiator Design

The NL-LC1 uses a relatively slim radiator design with:

• Aluminium fins
• Aluminium tubes
• Steel frame
• 20 fins per inch
• 30mm radiator thickness
• Approximately 59mm total radiator assembly thickness including the fan/gasket/screw arrangement

The relatively moderate fin density helps maintain airflow efficiency without requiring extreme fan RPMs.

Copper Cold Plate

The pump/block assembly uses a 99.95% high-purity copper cold plate.

The cold plate measures 55.5 × 55.5mm and uses a skived-fin micro-channel construction to improve heat transfer into the coolant.

Noctua also includes its NT-H2 thermal compound with the cooler.

SecuFirm2+ Mounting

The NL-LC1 doesn't abandon Noctua's traditional mounting philosophy.

It uses SecuFirm2+, including offset mounting options.

The offset configuration is particularly interesting for modern CPUs because it allows the cold plate to be positioned more effectively over the processor's concentrated heat-producing areas.

The system supports:

• AMD AM5
• AMD AM4
• Intel LGA1851
• Intel LGA1700

Optional NL-ACF1 Auxiliary Fan

Noctua also offers the NL-ACF1, a small auxiliary fan that can replace the standard metal pump faceplate.

Instead of contributing directly to CPU cooling, it directs airflow toward components around the socket, including:

• VRMs
• RAM
• M.2 SSDs
• Other motherboard components

This is useful because AIO coolers can remove the airflow that a traditional CPU tower cooler naturally provides around the motherboard socket.

NL-LC1 Models Compared

The NL-LC1-24 has an NSPR of 210, the NL-LC1-36 has 248, and the NL-LC1-42 reaches 268 according to Noctua's specifications.

NL-LC1 vs Traditional High-End AIOs

The NL-LC1 doesn't necessarily try to win every thermal benchmark by several degrees.

Its advantage is the performance-to-noise ratio.

Traditional high-end AIO

Strengths

• Strong cooling
• High pump speeds
• Aggressive radiator fans
• Often lower price

Weaknesses

• Pump whine can be noticeable
• Fans can become loud at high loads
• Acoustic tuning isn't always a priority

Noctua NL-LC1

Strengths

• Excellent acoustic tuning
• Very quiet pump
• Premium G2 fans
• Strong thermal performance
• No RGB/software dependency
• 6-year warranty

Weaknesses

• Premium pricing
• No integrated RGB/display
• Underlying pump platform is Asetek rather than completely proprietary
• No coolant temperature display/probe for monitoring

Tom's Hardware specifically praised its combination of silence and thermal performance while noting the premium price and lack of a coolant-temperature probe.

Who Should Buy the NL-LC1?

Best For

Silent PC enthusiasts
If noise is more important than RGB or flashy features, the NL-LC1 is one of the most compelling AIO designs available.

High-end CPU users
The 360mm and 420mm versions provide substantial thermal capacity for high-power desktop processors.

Content creators
Long rendering and compilation workloads benefit from sustained cooling without turning the PC into a loud workstation.

Professional workstations
The 6-year warranty and focus on reliability make the NL-LC1 attractive for systems that run for long periods.

Noctua fans
If you already value Noctua's acoustic philosophy, this is essentially that philosophy translated into liquid cooling.

Who Should Skip It?

Budget Builders

The NL-LC1's biggest weakness is value. Cheaper 240mm and 360mm AIOs can offer similar raw temperatures.

RGB Enthusiasts

There is no RGB lighting or display. The design is deliberately understated.

Users Who Don't Need Liquid Cooling

A high-end Noctua air cooler can still make more sense if your CPU doesn't require the additional thermal capacity of an AIO.

Reliability and Warranty

Noctua backs the NL-LC1 with a 6-year manufacturer's warranty.

The cooler uses EPDM braided tubing and a coolant mixture containing propylene glycol, water and various inhibitors for anti-freeze, anti-corrosion and biological protection.

Of course, an AIO still contains a pump and liquid loop, so it cannot have the same inherently simple failure profile as a passive heatsink.

The Noctua NL-LC1 Philosophy

The most important thing to understand about the NL-LC1 is that Noctua didn't simply take an Asetek AIO and put Noctua fans on it.

The product's identity comes from the complete acoustic system:

Asetek Emma V2 pump
↓
NL-PNA1 pump noise absorber
↓
NF-A12x25 G2 / NF-A14x25 G2 fans
↓
50 RPM fan speed offsets
↓
Optimized radiator + mounting system

The result is an AIO that emphasizes thermal performance without sacrificing acoustic refinement.

Final Verdict

The Noctua NL-LC1 is a fascinating first-generation liquid cooler because Noctua didn't attempt to reinvent every component.

Instead, it took an established AIO platform and concentrated its engineering effort where the company has the most expertise: fans, acoustics, vibration control, mounting and reliability.

The NL-PNA1 is the star of the design. Combined with the G2 fans and their speed-offset configuration, it helps the NL-LC1 deliver exceptionally smooth acoustics while still producing high-end thermal results.

The NL-LC1-36 is arguably the sweet spot for most high-performance desktop systems, while the NL-LC1-42 targets users who want maximum radiator capacity and the NL-LC1-24 makes more sense for compact builds.