CPU Cooler Check

Thermalright · Dual-tower air cooler

Peerless Assassin 120 CPU compatibility

Rated for 240 W sustained, it holds CPUs up to the Core i7-13700K (253 W) below their junction limit in our model, and keeps 86 of 120 processors in the Excellent band.

Reviewed by Farrukh Sufyan SarwarHow we estimate temperaturesPrices verified

Rated

240 W

Height

155 mm

Price

~$32

RAM clearance
47 mm
Type
Dual-tower air cooler
Sockets in the box
AM5AM4LGA1851LGA1700LGA1200
Thermalright Peerless Assassin 120 product photo
Amazon$38.90as of Sep 17, 11:38 PM UTC · In Stock

Check bundled mounting kits before ordering; revisions add sockets over time.

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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.

Design and fitment

The Thermalright Peerless Assassin 120 is a dual-tower air cooler rated for about 240 W of sustained heat at acceptable noise. It stands 155 mm tall, which fits most mid-tower and many compact cases, and clears 47 mm memory modules under its front fan in the stock position.

Mounting kits for AM4, AM5, LGA1200, LGA1700, LGA1851 are in the box. Every current desktop socket is covered.

Which processors it suits

Across the 120 processors it can mount, the Peerless Assassin 120 rates Excellent on 86 (72 %) and a throttling risk on 0. The most power-hungry chip it holds comfortably is the Core i9-12900 at 202 W (estimated 86 °C under full load). No supported processor pushes it into the throttling band.

In practice that makes it a good match for Core i7 / Ryzen 9 class chips and everything below, and for Core i9 parts with sensible power limits.

VS

Compared with close alternatives

01

AM5

bracket included
02

AM4

bracket included
03

LGA1851

bracket included
04

LGA1700

bracket included
05

LGA1200

bracket included

Terms used on this page

Sustained dissipation rating
The continuous heat load, in watts, a cooler can remove at acceptable noise. This site uses realistic sustained figures rather than marketing peak numbers, and models temperature as ambient plus load ÷ rating × a per-load scale.
Thermal headroom
The cooler's sustained dissipation rating minus the CPU's boost power limit, in watts. Positive headroom lets fans run slower and quieter; 25 W or more is rated Excellent here.
RAM clearance
The tallest memory module that fits under an air cooler's front fan in its stock position. Dual-tower coolers with less than 42 mm clash with tall RGB kits (typically 44 mm) unless the fan is raised.
CPU cooler height
The installed height of an air cooler from the motherboard, compared against the case's published CPU cooler clearance. Coolers at or above 160 mm exclude many compact Micro-ATX and tempered-glass mid-towers.
Dual-tower air cooler
An air cooler with two fin stacks and a fan between them (often a second in front). Highest air-cooling capacity, but the front fan overhangs the DIMM slots, which is where RAM clearance limits come from.