be quiet! PURE LOOP 240 BW006 — 240mm AIO Liquid CPU Cooler for Quiet Operation

This article takes a detailed look at the be quiet! PURE LOOP 240 BW006 — 240mm AIO Liquid CPU Cooler for Quiet Operation, covering compatibility, realistic cooling limits and who should skip it.

Overview

The short answer: the be quiet! PURE LOOP 240 BW006 is a 240mm all-in-one liquid cooler for mid-range builds where low noise comes first and a large tower air cooler is not wanted.

It comes from the German cooling brand be quiet! and pairs a 240mm radiator with two 120mm Pure Wings 2 PWM fans.

The fans top out at 1500 RPM, so the cooler is tuned for quiet operation rather than brute airflow.

Two design choices set it apart: the pump is decoupled from the CPU block to cut vibration, and the loop can be refilled. Most AIOs are sealed, so once the coolant level drops, the cooler is effectively at end of life.

A refill bottle is included, which gives this cooler a longer potential lifespan than most of its rivals.

The trade-off is that the 1500 RPM fan ceiling leaves little headroom for power-hungry flagship CPUs running flat out. The compatibility guide and the before-you-buy section below spell out where the limits are.

Compatibility Guide

Supported Sockets

Officially supported sockets are Intel LGA20XX / LGA1700 / LGA1200 / LGA115x and AMD AM5 / AM4. That covers Intel 12th to 14th Gen Core (LGA1700), AMD Ryzen 7000 / 9000 (AM5) and Ryzen 5000 and earlier (AM4).

AM5 keeps the AM4 mounting holes, so the AM4 hardware works as is.

Note that LGA1851, used by Core Ultra 200S, is not on the supported list. LGA1851 is widely reported to share LGA1700 hole spacing, and many coolers reuse their LGA1700 brackets on it.

However, since it is not in this product's official list, confirm with be quiet! or the Japanese distributor before buying for an LGA1851 build.

Case Fit (Radiator Thickness)

The radiator is about 27mm thick. Add standard 25mm-thick 120mm fans and you need a little over 50mm of clearance.

Even if a case says it supports 240mm radiators, a top-mounted radiator can collide with tall memory heatsinks or the motherboard VRM heatsink.

Check the case spec for maximum top radiator plus fan thickness and compare it with your RAM height. Front mounting avoids that issue, but then you need to check clearance against front drive cages and long graphics cards.

Power and Connectors

The pump uses a 3-pin connector and the fans use 4-pin PWM. A 3-pin pump can only be controlled by voltage, so connect it to a pump header such as AIO_PUMP, or set a regular fan header to 100% or DC mode in the BIOS.

Left on a PWM-mode header, a 3-pin pump may run slower than intended on some boards. The pump's maximum speed is 5500 RPM.

Realistic Cooling Capacity

A 240mm radiator with 1500 RPM fans leaves comfortable headroom for Core i5 and Ryzen 5 to Ryzen 7 class CPUs. A Core i9 with power limits removed, or a Ryzen 9 under sustained all-core load, is likely to sit near its thermal limit.

That applies to 240mm coolers in general, so for those chips either set power limits or consider a 360mm cooler.

Product Info

The spec does not state at what speed the 39.5 dBA figure was measured, so treat it as a near-maximum value.

With a gentle fan curve, the cooler can run very quietly at idle and under light load. The box includes Intel and AMD mounting hardware, a coolant refill bottle and thermal paste.

Prices varied between capture dates. On Amazon.co.jp it was ¥9,805 as of July 2026 and ¥12,645 as of August 2026.Check the retailer's page for the latest price.

Sale prices move further.

As of July 2026, the Amazon.co.Check the retailer's page for the latest user reviews.

With that many reviews and a stable rating, there is no sign of widespread early failures or large unit-to-unit variation.

Comparison with Competitors

In the same budget range, buyers usually weigh three directions:

• 240mm AIOs with an LCD (e.g. NZXT Kraken Elite 240): a 2.37-inch LCD on the pump head offers far more visual customization, at a higher price. Choose the PURE LOOP 240 for quietness and refillability, an LCD model for looks.
• 120mm AIOs (e.g. CORSAIR iCUE H60x RGB ELITE): easier to fit in small cases, but with half the radiator area. If a 240mm fits your mid-tower, it wins on both thermal headroom and noise.
• Large air coolers (e.g. Thermalright Phantom Spirit 120 SE): no leak or pump-failure risk and often cheaper. If your case is wide enough and RAM clearance is fine, air can deliver similar cooling for less. The PURE LOOP 240 makes more sense when you want a clean CPU area or a tall air cooler won't fit.

For seriously hot CPUs, a 360mm cooler such as the CORSAIR H150 RGB is the better match.

Installation and Maintenance Tips

As with any AIO, mount the radiator so it sits higher than the pump. Air in the loop then collects at the top of the radiator instead of reaching the pump.

For front mounting, route the tubes out of the bottom of the radiator to avoid air-related noise.

The fans work as intake or exhaust. Top exhaust keeps heat from building up inside the case, while front intake feeds the CPU cooler fresh air at the cost of slightly warmer case air.

In builds with a hot graphics card, top exhaust usually balances temperatures better.

Refilling is not routine maintenance. Consider it after a few years if pump noise changes or temperatures creep up.

Check the manual for the refill procedure and for any effect on the warranty before doing it.

Who Should Buy

• Silent PC builders: the 1500 RPM fan ceiling and the decoupled pump keep the whole design quiet. With a gentle fan curve it is very quiet at idle.
• Core i5 / Ryzen 5 to Ryzen 7 owners who want to avoid a tall air cooler: these CPUs leave plenty of thermal headroom, and the cooler frees up space around the socket.
• Users who want an AIO to last: few AIOs can be refilled, and that is a real advantage over sealed units.

Before You Buy

Not suited to flagship CPUs with power limits removed. With fans capped at 1500 RPM, there is no high-RPM reserve.

A Core i9 or Ryzen 9 under long heavy loads such as video encoding or rendering will likely run near its thermal limit. For that kind of work, plan on power limits or buy a 360mm cooler.

Not for lighting enthusiasts. This cooler is built around quiet, practical operation, not RGB effects or an LCD display.

If case aesthetics matter most, an LCD or ARGB model will satisfy you more.

LGA1851 (Core Ultra 200S) is not officially listed, as covered above. It may fit, but don't buy for that platform without confirming.

A case's 240mm support alone is not enough. The 27mm radiator plus fan thickness often collides with RAM or VRM heatsinks in top mounts.

Measure first.

The price moves a lot. It went from ¥9,805 in July 2026 to ¥12,645 in August 2026, roughly a 30% swing in a month.

If you are not in a hurry, waiting for a dip is reasonable. Also note that one price entry was labeled Amazon US while the actual link pointed to Amazon.co.jp, so check the seller and the domestic-distributor label on the product page.

Parallel imports are sometimes listed alongside, so check the seller and warranty contact, and keep your receipt.

FAQ

Q. Does it fit Ryzen 7000 / 9000 (AM5)? A.

Yes. AM5 is on the supported list and uses the AM4 hole pattern, so the included AMD hardware works.

Q. Can I use it with Core Ultra 200S (LGA1851)? A.

LGA1851 is not on the official list. It reportedly shares LGA1700 spacing, so it may work, but confirm with the manufacturer or distributor first.

Q. Where should I connect the pump? A.

It is a 3-pin pump, so a dedicated pump header such as AIO_PUMP is safest. On a regular fan header, set it to full speed or DC mode in the BIOS.

Q. How often does the coolant need refilling? A.

It is not designed for scheduled refills. Consider it after a few years if pump noise or temperatures change, and check the manual for the procedure and warranty impact.

Q. Is a large air cooler a better choice? A.

If your case is wide enough and RAM clearance is fine, a large air cooler is cheaper with fewer failure points. The PURE LOOP 240 suits builds where you want a clear socket area or a tall air cooler won't fit.

Product Disclosure (Amazon)

• Manufacturer: be quiet!
• ASIN: B08K3R64L5
• Note: This article covers a manufacturer-made product based on Amazon listing details.