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Deal.ai › Compare

Arctic Liquid Freezer III 240 vs Thermalright Peerless Assassin 120 SE

The Peerless Assassin 120 SE is the safer buy for most people: it cools 245W-class CPUs, has no pump to fail, and costs far less than any AIO. The Liquid Freezer III 240 wins on sustained heavy loads, fits tighter cases, and keeps weight off the motherboard, but adds pump noise and a wear part. Reviewers rate both as class leaders; the Arctic edges out on thermals, the Thermalright on value and simplicity.

  • Choose the Arctic Liquid Freezer III 240 if you run a high-wattage CPU under long all-core loads and want the lowest sustained temperatures with a compact 240mm radiator.
  • Choose the Thermalright Peerless Assassin 120 SE if you want strong cooling with no pump, no software and nothing to wear out, and your case fits a 157mm-tall tower.

Prices

  • Arctic Liquid Freezer III 240: $100.00 at Whatnot (last seen Nov 13)
  • Thermalright Peerless Assassin 120 SE: $31.49 at Amazon (last seen Nov 13)
  • Difference: the Thermalright Peerless Assassin 120 SE is $68.51 cheaper than the Arctic Liquid Freezer III 240 at the latest prices (Nov 13)
ARCTIC
ARCTIC Liquid Freezer III 240 AIO CPU Cooler

Arctic Liquid Freezer III 240

ARCTIC Liquid Freezer III 240 AIO CPU Cooler

5(5 ratings)
$100.00at WhatnotChecked Nov 13
See all prices and details
Visit Whatnot
Pros
  • Lowest sustained temperatures on high-TDP chips
  • Weight carried by the case, not the motherboard
  • Wide 200-1800 RPM fan range for quiet idle
  • Fits cases where a 157mm tower will not
Cons
  • Pump adds a noise source and a wear part
  • More install steps than an air tower
  • Radiator and tube routing need case space
Thermalright
Thermalright Peerless Assassin 120 SE CPU Air Cooler

Thermalright Peerless Assassin 120 SE

Thermalright Peerless Assassin 120 SE CPU Air Cooler

$31.49at AmazonChecked Nov 13
See all prices and details
Visit Amazon

Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.

Pros
  • 245W rating handles most mainstream and enthusiast CPUs
  • No pump, no software, nothing to fail
  • Quiet at load with two 120mm PWM fans
  • Simple install and long service life
Cons
  • 157mm height and 1kg weight limit some builds
  • Can block tall RAM and needs case clearance
  • Fan ceiling of 1500 RPM limits headroom on extreme loads

What separates them

Arctic Liquid Freezer III 240Thermalright Peerless Assassin 120 SE
Cooling type240mm liquid loop with pump and two 120mm fansDual-tower air heatsink with six 6mm heat pipes and two 120mm fans
Rated heat capacityNot published; tuned for high-TDP CPUs245W TDP
Noise22.5 dBA fans plus pump whine from 800-2800 RPMUp to 25.6 dB fans, no pump noise
Case clearanceRadiator mounts at the case edge; 450mm tubes; 1490g157mm tall, 125x135mm footprint, 1.02kg hanging on the socket
Moving parts and lifespanPump is a wear item; loop can develop air or failFans only; heatsink lasts indefinitely
Motherboard stressWeight sits on the case, not the board1kg tower loads the socket and board
Fan speed range200-1800 RPM, 56.3 CFM, 2.20mm-H2O1500 RPM +/-10%, 66.17 CFM
InstallationBackplate, pump block and radiator routingStraightforward tower mount; check RAM and case height

Price history

  • Arctic Liquid Freezer III 240: lowest $100.00 on Nov 13 at Whatnot.
  • Thermalright Peerless Assassin 120 SE: lowest $31.49 on Nov 13 at Amazon.

Prices at every store

Arctic Liquid Freezer III 240

  • Newegg.comNew

    In stockSold by SparkNest

    $179.27Free shippingChecked Nov 13
    Visit Newegg.com
  • Compu DevicesNew

    In stock

    $213.33Free shippingChecked Nov 13
    Visit Compu Devices
  • WhatnotNew

    Availability unknown

    $100.00+ $8.35 shippingChecked Nov 13
    Visit Whatnot
  • WalmartNew

    Out of stockSold by Altius TechnologiesReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $134.52Checked Nov 13
    Visit Walmart
All 4 stores and price history →

Thermalright Peerless Assassin 120 SE

  • WalmartNew

    In stockSold by GIIZHMYReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $48.99Free shippingChecked Nov 13
    Visit Walmart
  • NeweggNew

    In stock

    $49.90Free shippingChecked Nov 13
    Visit Newegg
  • Zaytoun SolutionsNew

    In stock

    $51.06Free shippingChecked Nov 13
    Visit Zaytoun Solutions
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $31.49Checked Nov 13
    Visit Amazon

Store links may earn us a commission. Some prices via Klarna.

All 6 stores and price history →

Specs compared

SpecArctic Liquid Freezer III 240Thermalright Peerless Assassin 120 SE
Fan size120mm120x120x25mm (4.72x4.72x0.98 inches)
Fan speed200 RPM to 1800 RPM1500rpm+-10%
ColorBlack—
Fan Diameter120 mm fan diameter—
Fan noise22.5 dBA—
Fan system2 x 120mm Fans—
Fan airflow56.3 CFM—
Fan max air pressure2.20mm-H2O—
Fan bearingFluid Dynamic Bearings—
Water pump speed800 - 2800 RPM—
Radiator size240mm—
Radiator materialAluminum—
Show all 25 specsShow fewer specs
SpecArctic Liquid Freezer III 240Thermalright Peerless Assassin 120 SE
Weight1490 g—
Tube length450mm—
size240 mm—
Cooler dimensions—125(L)x135(W)x157(H)mm (4.92x5.31x6.18 inch)
Product weight—1.02kg(2.25lb)
Fan connector—4pin
Fan voltage—12V
Air flow—66.17CFM(MAX)
Noise level—<=25.6dB
Heat pipes

What reviewers say

Arctic Liquid Freezer III 240

Owners and reviewers rate the Liquid Freezer III 240 as one of the better-value 240 mm AIOs, praising its cooling for the size and the VRM fan. Complaints center on the pump fan's noise and on mounting clearance in smaller cases.

What people mention
  • CoolingPraisedOwners say it keeps mid-range CPUs cool under sustained load for a 240 mm unit.
  • VRM fanMixedReviewers like the extra motherboard cooling but some find the small fan audible.
  • NoisePraisedThe 120 mm fans are described as quiet at low and moderate speeds.
  • ClearanceCriticisedSome builders report the radiator and fan stack is tight in compact cases.

Thermalright Peerless Assassin 120 SE

Reviewers and owners widely praise the Peerless Assassin 120 SE as one of the best-value air coolers, with cooling close to much more expensive dual-tower models. Complaints center on installation fuss and clearance in tight builds.

What people mention
  • Cooling performancePraisedOwners say it keeps high-TDP CPUs cool under sustained gaming and rendering loads.
  • NoisePraisedReviewers describe it as quiet at normal fan speeds, with noise only noticeable near full RPM.
  • ValuePraisedReviewers repeatedly call it the best cooling per dollar among dual-tower air coolers.
  • InstallationMixedSome builders find the mounting and fan clips fiddly, while others say setup is straightforward.

Questions and answers

Which is better for a high-end gaming CPU?
For most gaming builds the Peerless Assassin 120 SE is enough and simpler. Step up to the Liquid Freezer III 240 only if you run long all-core workloads or a very high-TDP chip.
Which lasts longer?
The Peerless Assassin has no pump, so its heatsink effectively never wears out; only fans may need replacing. The Liquid Freezer's pump is a moving part that can fail or get noisy over years.
Will the Peerless Assassin fit my case?
It needs 157mm of cooler height and clearance for a 125x135mm tower, plus room for tall RAM. Check both before buying; the 240mm radiator is easier to fit in tight cases.
Is the Liquid Freezer worth stepping up to?
Yes if you want lower sustained temperatures on a power-hungry CPU or your case cannot fit a tall tower. Otherwise the air cooler covers the same CPUs quietly.
Which is quieter?
The Peerless Assassin is usually quieter at idle because it has no pump. Under heavy load the Liquid Freezer's fans can run slower, but pump noise remains.

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—
6×6mm heat pipes
Cooling capacity—245W
Heat dissipation area—9600cm²
Height—157mm