Head-to-head · Best Air Coolers Under $100

Noctua NH-L9i vs Thermalright Peerless Assassin 120

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Thermalright Peerless Assassin 120 comes out ahead by a narrow margin (4.3 vs 4.4). The gap is mostly about budget-conscious mainstream users — read the strengths below before deciding.

Ranked #3 in Best Air Coolers Under $100

Noctua NH-L9i

4.3

$69

The Noctua NH-L9i chromax.black delivers excellent build quality and a stealthy all-black aesthetic for ITX and HTPC builds. PCMag's Joel Hruska praised its silent operation and compact footprint, while Tech4Gamers reviewer Awais Khan gave it 8/10 overall, noting it's ideal for casual users and smaller setups. However, reviewers consistently note it's not designed for extreme overclocking or high-TDP applications, with Tech4Gamers rating its performance at 7/10. This cooler fits best in compact systems where space and aesthetics matter more than raw cooling performance.

Strengths

— 100% RAM and PCIe clearance for compact ITX builds
— Silent operation up to 65W TDP
— Compact design suitable for small form factor systems

Watch-outs

— Not recommended for overclocking or high-power workloads
— Performance rated at 7/10 in benchmarks

$69 · Check Price on Amazon Full review →

Higher ratedRanked #2 in Best Air Coolers Under $100

Thermalright Peerless Assassin 120

4.4

$29

The Thermalright Peerless Assassin 120 delivers impressive cooling performance at an affordable price point, making it a strong contender for budget-conscious builders. Tom's Hardware praised its 'incredible, affordable air cooling performance,' while PC Gamer noted its solid build quality and quiet operation. However, some reviewers cautioned that it may not handle extreme overclocking scenarios as well as more premium options. This cooler is ideal for mainstream users seeking reliable cooling without breaking the bank, but enthusiasts pushing high-end CPUs might want to consider more robust alternatives.

Strengths

— Excellent cooling performance for an affordable air cooler
— Quiet operation under typical loads
— Solid build quality with durable materials

Watch-outs

— May struggle with very high-end CPUs under extreme overclocking
— Limited RGB lighting options

$29 · Check Price on Amazon Full review →

How they stack up

Noctua NH-L9i

The Noctua NH-L9i is uniquely designed for compact ITX builds, offering 100% RAM and PCIe clearance unlike the Thermalright Phantom Spirit 120 EVO and Scythe Fuma 2, but it's less effective than the Noctua NH-U12S redux and Cooler Master Hyper 212 Black Edition for high-TDP CPUs. It's more compact than the be quiet! Dark Rock Pro 5 but lacks the performance and features of the premium models.

Thermalright Peerless Assassin 120

The Thermalright Peerless Assassin 120 provides excellent value for budget builds, matching the cooling performance of the Noctua NH-U12S redux and Scythe Fuma 2 at a lower price point. It's more affordable than the Thermalright Phantom Spirit 120 EVO and be quiet! Dark Rock Pro 5, but lacks the advanced heat pipe technology and build quality of the premium models.

Specs side-by-side

Spec	Noctua NH-L9i	Thermalright Peerless Assassin 120
Cooler Type	Low-profile air cooler	Air Cooler
Fan Size	1x 92mm Noctua NF-A9px1	120mm
Heat Pipes	2	6
TDP Rating	65W	180W
Noise Level	19.6 dBA	22-30 dBA
Height	37 mm	145mm
Interface	LGA 115x, AM4, AM5	PWM
Compatibility	ITX/HTPC builds	LGA 1700, AM5, AM4, LGA 1200, sTRX4

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