BeQuiet! Silent Loop 3 (BW025): Founded on elite fans

The latest of BeQuiet!’s liquid coolers – the Silent Loop 3 – delivers exceptionally high cooling performance, thanks in part to its premium 120mm Silent Wings 4 (Pro) fans. The Silent Loop 3 with a 360mm radiator meets the criteria and demands of even the most demanding users while maintaining wide compatibility with cases. However, achieving ultra-quiet operation will require slowing down the pump.

Conclusion

The cooling performance of the Silent Loop 3 (BW025) is top-tier. This is particularly evident on the Intel LGA 1851 platform, where it keeps the Core Ultra 9 285K processor at the second-lowest temperatures we’ve recorded. It’s only outperformed by the PCCooler CPS DT360 ARGB Display, though that cooler becomes significantly louder at maximum fan speeds.

For example, when compared to the Fractal Design Lumen S36 V2 liquid cooler, our tested Silent Loop 3 demonstrates superior cooling performance while maintaining only a marginal difference in noise levels. The BeQuiet! cooler also maintains an advantage on AMD’s AM5 platform, though the temperature difference is less pronounced due to the lower heat flux density of the Ryzen 9 9950X processor we use for testing. The Silent Loop 3 also delivered excellent VRM cooling results in our tests.

At first glance, noise-normalized test results might suggest the Silent Loop 3 underperforms expectations, but the reality is more nuanced. Its relatively weaker positioning in the “45 dBA” mode and absence from quieter profiles stems from higher pump noise levels. However, this doesn’t mean the Silent Loop 3’s pump has to always be loud – it only becomes noticeably audible at maximum 12V/100% PWM operation, which can be reduced to quiet the pump. The SL3’s pump is substantially over-engineered – even at 7V (on the new cooler), cooling performance didn’t significantly degrade at maximum radiator fan speeds. At this reduced voltage, pump noise becomes far less prominent, allowing fan aerodynamic noise to dominate the acoustic profile. This fan noise ultimately determines the achievable cooling efficiency at any given noise level.

The most attractive performance results come from finding the “right” balance between fan and pump settings – something our current methodology doesn’t yet capture, but we plan to address this in future testing. Determining the optimal pump-to-fan flow ratio for liquid coolers is particularly challenging when aiming for objective, standardized results. While the Silent Loop 3’s pump is indeed quite noisy at 12V (enough to be heard over the cooler’s slowed fans), its adjustability remains a key advantage. Although motherboard Pump_fan headers typically default to 100% power (PWM or 12V DC), this setting can be customized to achieve near-silent operation when desired.

I may explore pump regulation to find this “sweet spot” in future testing – if not with this model, then certainly with upcoming liquid coolers where this aspect will receive particular attention. Sometimes pump speed adjustment is simply necessary. Higher noise levels are an inherent characteristic of more powerful models, which needn’t be problematic provided you’re aware of it and can quiet the pump through appropriate speed control.

The Silent Loop 3 (BW025) is undoubtedly an attractive liquid cooling solution. We’ve already thoroughly tested its fan characteristics, so we won’t revisit them in detail here. What deserves emphasis is its above-average case compatibility (featuring standard-thickness radiators and fans with a relatively slim overall profile) and comprehensive socket support (including TRx platforms).

The cable management could perhaps be slightly more elegant – several competing solutions handle this aspect better. Otherwise, I can wholeheartedly recommend this cooler. Some users might also appreciate the understated lighting on the water block cover.

English translation and edit by Jozef Dudáš

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* This statement refers to performance at maximum pump flow. When reducing pump speed, noise levels decrease while cooling performance (at least with new units) remains unaffected.
** This applies to our standardized test modes (where we can’t simply slow down the cooler if the pump becomes too loud at full power). However, through manual tuning and finding the right pump settings, you can achieve quieter operation.

CPU coolers are also available at Datacomp’s e-shop.