Collection: Liquid CPU Cooler

Which liquid CPU cooler do you actually need?

Most PC builders pick an all-in-one by radiator size and RGB, when the real differences sit in the cold plate, pump design and radiator thickness. A 120mm or 240mm entry unit uses a thinner radiator with fewer coolant channels. It handles a mid-range chip fine, but a high-wattage chip can push the fans hard enough to be annoying. The sweet spot is a 280mm or 360mm radiator with a decent pump and fans on fluid dynamic bearings. That tier gives enough surface area to hold a 200W-class processor at moderate fan speed. Enthusiast 360mm and 420mm units add more radiator area, higher static pressure fans and often an LCD or a more efficient pump. Thermal gains past a quality 360mm are small, a few degrees at most, while the cost climbs quickly. Past that point you are mostly paying for looks and fan quality.

If you are running a lower-power chip from the CPUs & Processors range, a good air cooler from Fans, Heatsinks & Cooling will often match a small AIO with fewer failure points. A liquid cooler earns its place when the CPU draws serious sustained power or when you want the space around the socket clear.

Upgrading and technical nuances

The big engineering trade-off is how heat moves. Air coolers push heat through heatpipes into a fin stack beside the CPU. An AIO moves it through coolant to a radiator that sits somewhere with better airflow. That means the CPU block can stay small, and a big radiator can dump heat straight out of the case. The quality of the cold plate matters too. Look for a flat copper plate with dense microfins. A weak plate or low mounting pressure shows up as spiky core temperatures even with a big radiator.

On modern platforms, AM5 and Intel Core Ultra LGA1851 both have mounting quirks. AM5 coolers use the existing socket frame, so AM4 brackets often work, but check the listing. LGA1851 keeps the LGA1700 hole spacing, so most recent coolers fit. Some brands now ship contact frames or offset mounting kits to improve pressure on the taller, narrower hotspot layouts. Arctic Liquid Freezer III is a good value example of this, with thick radiators and solid pressure. Thermalright's Frozen and Aqua lines, DeepCool LT, and Lian Li Hydroshift or Galahad cover the sweet spot well. Corsair's iCUE Link and NZXT Kraken units sit in the premium bracket, where you pay extra for software, daisy-chained fans and screens.

Pump noise is the other trade-off. Cheaper pumps can whine or buzz at fixed speeds, so a model with PWM pump control lets you tune it in the BIOS. Fan bearings matter as well. Sleeve bearings are cheap but wear faster, while fluid dynamic or magnetic-levitation bearings stay quieter for longer. If your board is a high-end Motherboard with a dedicated AIO_PUMP header, use it. A pump on a regular fan header may get throttled and overheat the CPU.

Practical things to check before buying

Start with the case. Check your Computer Case spec sheet for the radiator sizes it supports, and where. Top mounts are common, but some cases only fit a 240mm up there or limit the thickness of the radiator once fans are added. Front mounts usually give the most room. Also check tube length. If you want the radiator at the top of a mid-tower with a big board, short tubes can leave you stretched.

Next is memory clearance. A top-mounted radiator over the VRM area can collide with tall heat spreaders on kits from Desktop Memory. Most current DDR5 kits are low enough, but RGB light bars on some can add several millimetres. Radiator thickness plus fan thickness can sit as much as 55mm or more above the case roof mounts, so measure.

Orientation matters for pump life. Mount the radiator so the pump block is not at the highest point in the loop, otherwise trapped air collects in the pump and causes noise or reduced cooling. Front-mounting with tubes at the bottom or side is safest. Top-mounting generally works if the radiator sits above the pump.

Power and cabling are easy to overlook. You will need a pump header, fan headers or a hub, and possibly a USB 2.0 header or SATA power for the lighting and screen. Count your board's spare headers before ordering. Decent Cables & Connectors such as splitters or fan hubs solve most shortages. A high-wattage CPU paired with a power-hungry card from Graphics Cards / GPU also pushes case heat up, so make sure your airflow can deal with both. A quality ATX 3.x unit from Power Supplies keeps the rest of the system stable under that load.

If you want more options, browse the full CPU Cooling range.

Brands and local warranty

Reputable names in this category include Arctic, Corsair, NZXT, DeepCool, Lian Li, Thermalright, MSI, ASUS ROG, Cooler Master and be quiet!. Each has its own strengths, whether that is value, software, noise tuning or design polish. Many AIOs are built by a small group of OEMs, so the difference is often in the fans, firmware, pump tuning and support rather than the core hardware.

Local warranty matters more here than with most parts because an AIO has a pump and liquid. Most carry multi-year coverage. Under Australian Consumer Law you are entitled to a remedy if a product fails within a reasonable time, and buying through an Australian retailer with local support makes that far simpler than shipping a leaking unit overseas. Keep your invoice and the original mounting hardware.

Frequently asked questions

Is a 360mm radiator always better than a 240mm?

Generally it will cool better or run quieter at the same temperature, because there is more surface area. It only matters if your case fits it and your CPU produces enough heat. For a modest chip, a 240mm is plenty.

Will my AIO fit AM5 and LGA1851 sockets?

Most current models do, but always check the listing for the specific socket. AM5 reuses AM4 mounting in many cases, and LGA1851 uses the same hole spacing as LGA1700, though some older kits need a newer bracket.

Do AIOs leak often?

Failures are uncommon, but they do happen, usually from poor quality control or old age. Choose a known brand with solid warranty terms and mount it correctly.

How long does an AIO last?

Many run for five to seven years. Coolant slowly permeates through the tubing, and pumps eventually wear, so performance may drop near the end.

Is liquid cooling quieter than air?

Not automatically. A big air cooler can be quieter than a small AIO. Liquid helps most on hot, high-power CPUs where a larger radiator can run its fans slower.