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The Thermalright Peerless Assassin 120 SE is one of the best-selling CPU coolers on Amazon, and for good reason. At around $35 it delivers thermal performance that competes with coolers costing three times as much. If you are building a gaming PC and want the best value in CPU cooling, this is the cooler to beat.
The Short Verdict
The Peerless Assassin 120 SE is the best value CPU air cooler available. Its dual-tower, six heat pipe design with twin 120mm fans handles any mid-range to high-end gaming CPU with ease, running cooler and quieter than coolers at twice the price. For any build that is not an extreme overclocked flagship, this is all the cooler you need.
Performance
The dual-tower design with six heat pipes and two 120mm PWM fans moves an impressive amount of heat for the price. On a mid-range gaming CPU it keeps temperatures well within safe ranges under sustained load, and it does so quietly. In real terms it performs within a few degrees of premium coolers like the Noctua NH-D15 that cost three times more.
For a gaming build, a CPU cooler only needs to keep your processor below its throttling point under load while staying quiet. The Peerless Assassin 120 SE does exactly that. The extra money you would spend on a premium cooler buys you only a 2 to 4 degree improvement that makes no difference to gaming performance.
Build Quality and Installation
For a budget cooler the build quality is excellent. The fins are well finished, the heat pipes make solid contact, and the included mounting hardware is straightforward. Installation takes about 10 minutes and supports modern AMD AM5 and Intel LGA 1700 and 1851 sockets.
One thing to check before buying is RAM clearance. Like most dual-tower coolers it sits close to the first RAM slot, so very tall RGB memory may require mounting the front fan slightly higher. Standard height RAM clears without issue.
When to Buy Something Else
The Peerless Assassin 120 SE handles the vast majority of builds, but there are two cases where you might step up. If you are running an overclocked flagship CPU under sustained all-core workloads like heavy rendering, a premium cooler like the Noctua NH-D15 G2 or a 360mm AIO buys you a few more degrees of headroom. And if you specifically want RGB lighting, this cooler is utilitarian black with none.
For everyone else, including the vast majority of gaming builds, the Peerless Assassin 120 SE is the smart choice. See our full best CPU air coolers guide for how it ranks against the rest.
Apply Good Paste
The cooler includes thermal paste that is perfectly serviceable, but if you want the best results, a fresh application of Thermal Grizzly Kryonaut or Arctic MX-7 applied with the pea-dot method squeezes out the last degree or two. See our thermal paste guide for the correct technique.
The Bottom Line
At around $35 the Thermalright Peerless Assassin 120 SE is the best value CPU air cooler you can buy in 2026. It performs within a few degrees of coolers costing three times as much, installs easily, and runs quietly. Unless you are running an extreme overclocked flagship or you specifically want RGB, this is the cooler to buy.
Prices are approximate and change frequently. Check current Amazon pricing before purchasing.