This article covers ASUS ProArt LC 420mm AMD.
Overview
The ASUS ProArt LC 420 is a flagship all-in-one liquid CPU cooler from ASUS's ProArt lineup, featuring a massive 420mm radiator and three Noctua NF-A14 IndustrialPPC-2000 PWM fans. Designed for creators and enthusiasts who demand uncompromising cooling, this cooler combines industrial-grade components with a sophisticated, minimalist aesthetic. The pump head incorporates an illuminated status meter that displays real-time CPU load, coolant temperature, and fan speed — a rarity in AIO coolers.
Under the hood, a three-phase pump motor provides stable, low-vibration operation with extended lifespan. The 450mm reinforced sleeved tubing offers flexible routing even in large tower cases. With its 420mm radiator, this cooler delivers the highest thermal dissipation capacity among standard AIOs, making it ideal for today's most power-hungry desktop processors.
Connectivity & Compatibility
The ProArt LC 420 supports major CPU sockets including Intel LGA1700, LGA1200, LGA115x, and AMD AM5, AM4. Note that LGA1851 is not officially listed at launch, so check ASUS support pages for future updates. The mounting hardware is universal and straightforward — the included bracket system works with both Intel and AMD platforms out of the box.
Crucially, the 420mm radiator requires a case that supports triple 140mm fans on the top or front. Many mid-tower cases are too narrow; full-tower or super-tower chassis are recommended. Measure your case's radiator clearance (width and length) before purchase. Standard 4-pin PWM fan headers are used for the fans, while the pump connects to a 4-pin (or 3-pin) header on the motherboard. The cooler is compatible with most modern motherboards featuring CPU_FAN or AIO_PUMP headers.
Product Info
The ASUS ProArt LC 420 launched in early 2024 and is available through major retailers such as online retailers. The street price hovers around ¥62,655 (premium tier). ASUS backs this cooler with a 6-year warranty, including leakage coverage. The package includes Intel and AMD mounting kits, all necessary screws and brackets, high-performance thermal compound, and a multilingual user manual.
Market position: Definitely high-end. The inclusion of Noctua industrial fans, a three-phase pump, and a smart status display places it above most 360mm AIOs. It competes directly with premium custom-loop alternatives in terms of thermal capacity, while offering the convenience of an all-in-one solution. Not for budget builders or small-form-factor PCs.
Best Use Cases
Enthusiasts and overclockers running high-core-count CPUs like the Intel Core i9-14900K or AMD Ryzen 9 7950X will see the greatest benefit. The 420mm radiator provides approximately 40% more surface area than a 360mm radiator, translating to lower temperatures under sustained all-core loads. Overclocking headroom is improved significantly, especially when paired with a good airflow case.
Creative professionals who work with 3D rendering, video editing, or scientific simulations will appreciate the silent operation. The Noctua NF-A14 fans are renowned for their low noise at high speeds — the 36 dBA rating is excellent for a fan running at 2000 RPM. The status meter allows quick visual checks without opening software, useful during long render sessions.
Not recommended for mainstream gaming builds or CPUs with lower TDP (e.g., Core i5, Ryzen 5). A 240mm or 360mm AIO is more cost-effective and easier to fit. Also unsuitable for small- or mid-tower cases due to radiator size. If you don't need the extra thermal headroom, the premium price is hard to justify.
