Noctua NH-U12S Redux High Performance CPU Cooler - Slim 120mm

In this review the Noctua NH-U12S Redux is examined as a value-focused, high performance CPU cooler for users who want proven thermal reliability without premium pricing. The redux edition pares back styling but keeps the core engineering that matters, making it an excellent choice for builders who need a slim 120mm cooler that fits most tower cases and will not overhang RAM or block a PCIe slot. The biggest reason to buy is straightforward: it delivers quiet, effective cooling with a compact footprint and a second fan option for a meaningful performance upgrade.

Key Features

• Slim 120mm design: Fits in most tower cases at 158mm height and keeps RAM and PCIe compatibility intact for modern builds.
• Quiet NF-P12 redux-1700 fan: PWM control provides full cooling under load while remaining near silent at idle for a low-noise system.
• Second fan kit included: The NA-FK1 add-on makes it easy to boost performance in demanding workloads without replacing the heatsink.
• Pre-applied NT-H1 thermal paste: Comes ready to install with quality thermal compound applied to simplify mounting and ensure good thermal transfer.
• SecuFirm2 mounting system: Compatible with a wide range of Intel and AMD sockets for straightforward installation and solid contact.

Who It's For

The NH-U12S Redux is aimed at PC enthusiasts and mainstream gamers who want dependable CPU cooling without buying the top-tier priced models. It suits owners of Intel Core and AMD Ryzen processors who need a cooler that will not interfere with tall RAM modules or most PCIe slot arrangements.

Users who demand extreme overclocking headroom or those building ultra-compact SFF systems should look elsewhere; the redux is optimized for a balance of size, noise and cooling rather than maximum overclocking performance or minimal small-form-factor footprint.

Pros & Cons

Pros

• Consistent, quiet cooling from the NF-P12 redux-1700 fan with PWM control.
• Compact 158mm height and slim profile that avoids RAM and PCIe interference in most cases.
• Includes a second fan kit for straightforward performance upgrades without buying a new heatsink.

Cons

• Not the highest-end model in Noctua's lineup, so extreme overclockers may prefer larger, dual-tower designs.

Specifications

Our Verdict

The NH-U12S Redux is a smart value pick for most builders who want Noctua reliability without the premium price. Its slim 120mm form, quiet fan and included second-fan kit give flexible, low-noise cooling that fits the majority of tower cases and keeps RAM and PCIe lanes accessible. For mainstream users and gamers it represents strong value and straightforward installation.

Frequently Asked Questions

Will this block my RAM?
No; the slim 120mm profile is designed to avoid overhanging standard RAM modules in most ATX and Micro-ATX layouts.

Does it support modern Intel and AMD sockets?
Yes; the SecuFirm2 mounting system and included hardware support Intel LGA115x, 1200, 2011, 2066 and AMD AM4 sockets listed by the manufacturer.

Is the second fan necessary?
The NA-FK1 second fan improves cooling under sustained heavy load but is optional for moderate use where single-fan performance is sufficient.