ARCTIC Liquid Freezer III Pro 420 AIO CPU Water Cooler
ARCTIC
ARCTIC Liquid Freezer III Pro 420 AIO CPU Water Cooler
The ARCTIC Liquid Freezer III Pro 420 is an all-in-one CPU water cooler designed for high-performance cooling on modern Intel and AMD processors. It combines a PWM-controlled pump and radiator fans with a cold plate optimized for CPU hotspots, suited to builders who need reliable thermal management in demanding workloads.
Why this product
Hotspot-targeted cold plate
The cold plate shifts toward the CPU hotspot rather than centering over it, improving heat transfer efficiency where temperatures peak.
VRM temperature control
A dedicated PWM fan cools the voltage regulator module, lowering VRM temps and stabilizing performance during heavy loads.
Integrated fan sleeving
Fan cables run inside the sleeving to reduce cable clutter and simplify the build process.
6-year warranty
Covers manufacturing defects across the pump, radiator and fans for six years from purchase.
- Radiator size420 mm (458 × 138 × 38 mm)
- Socket compatibilityIntel LGA1851, LGA1700 / AMD AM5, AM4
- Pump speed range800–2800 rpm (PWM controlled)
- Fan speed range400–2500 rpm
- Tube length500 mm
- Warranty6 years
- SKUARC-2533
- EAN4895265000362
- Intel LGA1851 and LGA1700 sockets.
- AMD AM5 and AM4 sockets.
- Some motherboards with oversized M.2 SSD coolers in the M.2_1 slot may interfere; ARCTIC supplies a compatible M.2 cooler at no charge for affected boards.
Best for
- High-end gaming and workstation builds needing sustained cooling performance.
- Builders who prioritize low noise; the 400–2500 rpm fan range allows quiet operation at partial load.
- Long-term reliability; the 6-year warranty and optimized contact pressure support CPU lifespan.
Trade-offs
- Compact cases: The 420 mm radiator is 458 mm long and 138 mm wide, requiring adequate mounting space.
- Passive cooling setups: This is an active water loop; it requires power and regular pump operation.
- Environments below 0 °C: Operating ambient temperature range is 0–40 °C.
Product information "Liquid Freezer III Pro 420" Multi Compatible All-in-One CPU Water Cooler
PWM-controlled fan lowers the voltage regulator temperature, ensuring stable performance. Shifts the cold plate to the CPU hotspot for more efficient heat transfer. Optimized contact pressure distribution for longer CPU lifespan and improved heat dissipation. Fan cables integrated into the sleeving simplify installation and minimize cable clutter.
Some motherboards may be incompatible with the Liquid Freezer III Pro due to oversized SSD coolers in the M.2_1 slot. For affected motherboards, we provide a compatible M.2 cooler free of charge.
General
| Brand | ARCTIC |
|---|---|
| Cold plate material | Copper with micro-skived fins |
| Radiator material | Aluminium |
| Thermal interface material | MX-6 (0.8 g) |
| Weight | 2370 g |
Fan
| Radiator fans included | 3× P14 Pro |
|---|---|
| Fan speed range | 400–2500 rpm |
| Airflow | 110 cfm / 186 m³/h |
| Static pressure | 5.2 mmH₂O |
| Fan bearing type | Fluid Dynamic Bearing |
Performance
| Pump speed range | 800–2800 rpm |
|---|---|
| VRM fan speed range | 400–2500 rpm |
| Pump power | 0.35 A / 12 V DC |
| VRM fan power | 0.05 A / 12 V DC |
| Radiator fans power | 0.35 A / 12 V DC |
Acoustics & power
| Operating ambient temperature | 0–40 °C |
|---|---|
| Tube outer diameter | 12.4 mm |
| Tube inner diameter | 6.0 mm |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.