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The best budget CPU coolers, and when the cheap one is enough

Last updated: By Ananya Kulkarni9 min readCooling & ThermalsPC Builds & Upgrades

The best budget CPU coolers, and when the cheap one is enough

For most desktops on a current socket, the budget cooler to get is the Thermalright Peerless Assassin 120 SE, a dual tower with two 120 mm fans that published reviews place alongside far bigger coolers. If a 110 mm deep dual tower will crowd your memory, the Cooler Master Hyper 212 Black is the slimmer single tower with one fan. For a short case, a 65 W class chip or an older board, the ARCTIC Freezer 7 X CO is 132.5 mm tall and has the longest socket list of the three, with an LGA 775 caveat below.

The small cooler is enough more often than spec sheets suggest. A chip that holds 65 to 95 W under sustained load needs a correct mount and a sensible fan curve far more than it needs a second tower.

What a budget cooler gives up

Budget coolers save in a few predictable places.

  • Mounting. Simpler coolers clip onto a frame instead of bolting through a backplate. HWCooling called the Freezer 7 X's push pins less secure and advised against moving a built PC with it fitted.
  • Fans. One fan instead of two, and sometimes a non-standard frame: the same review found a replacement for the Freezer 7 X fan needs a homemade bracket.
  • The base. Several budget towers press flattened heat pipes straight onto the heat spreader instead of a copper plate (Direct Contact at Cooler Master, direct touch at ARCTIC).

Fin area and fan airflow are where the picks below differ.

Size the cooler to the chip's sustained power

Older Intel chips carry one TDP figure (thermal design power: the heat the cooler is designed to handle at base clock). Recent Intel chips list a base power and a higher maximum turbo power, and many boards let the chip hold the higher figure for as long as the load lasts. Size for the higher number.

Chip Intel figure Budget cooler class
Xeon E5450 (LGA 771, often run in 775 boards) 80 W TDP Compact tower is borderline, single tower is comfortable
Core 2 Quad Q9650 (LGA 775) 95 W TDP Single tower
Core i5-12400 (LGA 1700) 65 W base, 117 W maximum turbo Single tower, or compact if you cap power at 65 W
Core i5-12600K (LGA 1700) 125 W base, 150 W maximum turbo Dual tower or a push-pull single tower

Published reviews line up with those classes. HWCooling found the two-pipe Freezer 7 X comfortable around 65 W on a Core i5-12400, but nearly 20 degrees C behind SilentiumPC's Spartan 5, a 146 mm single tower, once the same chip ran unrestricted at about 93 W. The FPS Review ran the Hyper 212 Black on a 105 W Ryzen 7 2700X and rated its thermals average and its noise the lowest of the coolers it compared. Tom's Hardware listed the Peerless Assassin 120 SE as capable of cooling 200 W and more on Intel's Alder Lake chips. Roughly: 65 W, 100 W, 200 W.

Say you have a Q9650 in an old office tower with about 140 mm of clearance. A 152 mm tower will not close the panel, and a two-pipe compact cooler would run at the edge of its range at 95 W: workable with a busier fan, not quiet. Run your chip through the cooler TDP headroom check; sizing a cooler by TDP explains why maker watt ratings are no help.

Five checks before you order

  1. Socket, and the revision. Read the maker's list for your exact socket. ARCTIC prints the product revision on the bottom of the box, and its online Freezer 7 X CO guides differ by revision: Rev 1 covers Intel LGA 1200 and 115x, Rev 3 adds LGA 1851 and 1700.
  2. Case height. Measure from the board surface to the inside of the side panel. The picks here run 132.5, 152, 155 and 159 mm.
  3. Memory. A dual tower or a push-pull tower can put a fan over the first DIMM slots. Thermalright's page tells you to leave clearance for tall memory modules. ARCTIC lists the Freezer 7 X CO's RAM clearance as no limit.
  4. Mount. A bolted backplate may mean taking the board out if your case has no cutout behind the socket. The Freezer 36 on LGA 1700 and 1851 also replaces Intel's retention bracket with ARCTIC's own frame.
  5. Noise figures. Thermalright quotes 25.6 dBA, Cooler Master 32.8 dBA and ARCTIC 0.3 sone, each measured its own way. Compare reviews that measure several coolers in one setup instead.

The picks

These picks come from makers' specification pages, their manuals and published reviews; we have not put any of them on a bench of our own.

Thermalright Peerless Assassin 120 SE: the one most builds should get

The Peerless Assassin 120 SE is two fin stacks on six 6 mm heat pipes, a nickel-plated copper base, one 120 mm fan between the towers and one on the front. Thermalright lists the heatsink at 125 x 110 x 155 mm and 730 g. Its TL-C12C fans top out at 1550 rpm, 66.17 CFM and 1.53 mm H2O. The socket list is Intel 115X, 1200, 1700 and 1851, AMD AM4 and AM5. LGA 2011 and LGA 775 are not on it.

Tom's Hardware tested it on a Core i9-12900K and called it the best-performing air cooler that reviewer had tested at the time, and quiet with it. Mounting is a backplate, standoffs, two brackets and captive screws on the cooler, with the fans clipped on last.

It suits any build on those sockets with about 160 mm of clearance, from a 65 W chip you want near silent to a 150 W chip that boosts hard. The trade-offs are physical: 730 g hanging off the board, a front fan that can sit over the memory, and a backplate that often means pulling the board.

Cooler Master Hyper 212 Black: the slim single tower

The Hyper 212 Black (model RR-S4KK-25SN-R1) is a single tower, 125 x 74 x 152 mm, with four direct-contact heat pipes and aluminum fins. Its SickleFlow 120 Edge fan runs 690 to 2500 rpm, rated at 70.7 CFM and 3.61 mm H2O. CryoFuze paste is in the box and the warranty is two years. Cooler Master lists Intel LGA 1851, 1700, 1200, 1151, 1150, 1155 and 1156, and AMD AM5 and AM4.

That covers every mainstream Intel socket from LGA 1156 onward, so it suits an older Core i5 or i7 tower. The FPS Review found it competitive with the DeepCool AK400 and the older Hyper 212 EVO, behind Iceberg Thermal's G6 Stealth, and noted a second fan wire in the box for push-pull. The 74 mm thin stack has less fin area than a dual tower, and the fan is audible when it nears its 2500 rpm top speed. Cooler Master has sold several Hyper 212 versions, so check the model number before trusting these figures.

ARCTIC Freezer 7 X CO: short, quiet at 65 W, and the older-board option

The Freezer 7 X CO is a compact tower, 74.3 x 110.5 x 132.5 mm and 425 g, with two 6 mm direct-touch heat pipes and 44 aluminum fins. Its 100 mm fan spins 300 to 2000 rpm under PWM on a dual ball bearing ("CO" stands for continuous operation), which suits a home server or a PC that never sleeps. Paste comes pre-applied; ARCTIC's spec sheet says MX-2, its product page MX-4. The warranty is six years.

ARCTIC's downloadable spec sheet lists Intel 115x, 1200 and 775, and AMD AM4, AM5, AM3(+) and FM1/2(+). The product page lists Intel 1851, 1700, 1200 and 115X, and AMD AM5, AM4 and AM3(+). None of the online install guides shows an LGA 775 mount. For 115x, 1200, AM4 and AM3(+) it is a straightforward fit. For an LGA 775 board, including a modded one running a Xeon through an LGA 771 to 775 adapter, treat the spec sheet line as a question for ARCTIC support with your box revision in hand.

ARCTIC files it under end-of-life products, so stock will thin out. Going by HWCooling's results on the closely related Freezer 7 X, expect it to run out of room above about 65 W.

ARCTIC Freezer 36: the alternative for LGA 1700, LGA 1851 and AM5

The Freezer 36 is a single tower with two P12 PWM PST fans in push-pull, four 6 mm copper heat pipes and 59 aluminum fins. ARCTIC lists it at 104 x 126 x 159 mm and 890 g, with fans running 200 to 1800 rpm. It supports only Intel LGA 1851 and 1700 and AMD AM5 and AM4, ships with a contact frame for the Intel sockets and 0.8 g of MX-6 paste, not pre-applied, and carries a six-year warranty.

Club386 ran it on a Core i9-13900K at 253 W, where it held lower temperatures than be quiet!'s Dark Rock Elite at each fan speed and was the quietest cooler in the test at full speed. The same reviewer had a fan clip break on the second removal. Pick it over the Peerless Assassin when you want the contact frame on Intel or prefer a single fin stack; skip it for anything older than LGA 1700.

Side by side

Cooler Type Height Fans Heat pipes Intel sockets (maker) AMD sockets (maker)
Peerless Assassin 120 SE Dual tower 155 mm 2 x 120 mm 6 x 6 mm 115X, 1200, 1700, 1851 AM4, AM5
Hyper 212 Black Single tower 152 mm 1 x 120 mm 4, direct contact 1156, 1155, 1150, 1151, 1200, 1700, 1851 AM4, AM5
Freezer 7 X CO Compact tower 132.5 mm 1 x 100 mm 2 x 6 mm, direct touch 115x, 1200, 1700, 1851 (775 on spec sheet only) AM3(+), AM4, AM5 (FM1/2(+) on spec sheet)
Freezer 36 Single tower, push-pull 159 mm 2 x 120 mm 4 x 6 mm 1700, 1851 AM4, AM5

Paste and the first mount

The Hyper 212 Black, Freezer 7 X CO and Freezer 36 all come with paste. A remount needs fresh paste: clean the old layer off both surfaces with 99 percent isopropyl alcohol, let it dry, and apply a thin layer of something like ARCTIC MX-4. Our repasting walkthrough covers the spread, and anti-static basics covers the bench.

Questions

Is a dual tower wasted on a 65 W chip?

No. The extra fin area lets both fans idle at low speed, and the chip barely warms it. The only costs are weight, width and memory clearance.

Will the Freezer 7 X CO fit my LGA 775 board?

Possibly. The spec sheet lists 775, but ARCTIC's online install guides show only 115x and newer Intel mounts. Ask ARCTIC support with the revision from the box bottom before you plan a 775 build around it.

Sources and further reading

Headshot of Ananya Kulkarni
Ananya Kulkarni

Ananya writes about builds and upgrades: power supplies, storage, memory and the order to do things in. She has a soft spot for reviving family PCs and a firm view that the cheapest upgrade is the one you can return.