Best CPU Heatsinks for Overclocking in 2026: 7 Air Coolers

The best CPU heatsink for overclocking in 2026 is the Noctua NH-D15 G2 if you want the strongest and quietest air cooling, and the Thermalright Phantom Spirit 120 SE if you want nearly the same cooling for much less. Both are large dual-tower coolers that can handle a heavily overclocked processor without the pump, tubing and leak risk of a liquid cooler.

Overclocking raises both the clock speed and the voltage, and heat output rises faster than either. A processor that draws about 125 W at stock can pull more than 200 W when pushed, and the cooler has to move that heat out of a small metal lid. This guide ranks seven air heatsinks by how well they handle high-wattage chips, explains what to check before you buy, and shows how to size a cooler for your target.

Our top picks

Top pickNoctua NH-D15 G2 chromax.Black

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Also greatbe quiet! Pure Rock Pro 3 Black

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Also greatNoctua NH-D15 G2 HBC

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Quick comparison of the seven picks

Dimensions and heat ratings come from the manufacturers’ product pages. A TDP rating is a manufacturer’s guide, not a promise, so use it as a relative measure rather than a guarantee of temperatures.

Why air cooling still works for overclocking

A heatsink moves heat from the processor lid into metal fins, and fans carry the heat away. Large dual-tower coolers use several copper heat pipes to spread heat across two fin stacks. Reviewers have found that the best air coolers come within a few degrees of a 360 mm liquid cooler in many situations, and that cheaper Thermalright models can come within one or two degrees of far more expensive coolers on modern processors. Air coolers also have no pump to fail and no fluid to leak.

Liquid cooling keeps an advantage in two cases. A 360 mm liquid cooler handles the very hottest chips, including overclocked Intel Core i9 processors, with more headroom. It also moves the cooler’s bulk away from the motherboard, which helps with memory and case fit. For most overclockers using a mid-range or high-end chip, a top air cooler is the simpler and more reliable choice.

Best overall: Noctua NH-D15 G2

The Noctua NH-D15 G2 is a dual-tower cooler with eight heat pipes, two 140 mm fans and a larger fin area than the original NH-D15, according to Noctua’s specification page. It is 168 mm tall, so check case clearance. It supports AMD AM5 and Intel LGA 1700 and LGA 1851 sockets with its mounting hardware. Reviews put it among the best air coolers available, holding a 16-core Ryzen 9 chip under full load in the low 70s Celsius in one roundup, at very low noise.

Who it suits: enthusiasts who want the lowest temperatures and the least noise from air cooling and have the case space.

Pros: excellent cooling and noise levels, strong mounting system, long warranty.

Cons: premium pricing, very large, and it can cover memory slots or the top PCIe slot on some boards.

Best value flagship: Thermalright Phantom Spirit 120 SE

The Thermalright Phantom Spirit 120 SE is a dual-tower cooler with seven heat pipes and two 120 mm fans, standing 157 mm tall. Reviewers found it cooled an Intel Core i7-14700K to within about one degree of the Noctua NH-D15 and stayed within two degrees of the NH-D15 G2 when gaming on a Ryzen 7 9800X3D. It has an edge over the Peerless Assassin on chips drawing 200 W or more.

Who it suits: overclockers who want near-flagship cooling without the flagship price.

Pros: outstanding performance for the tier, simple mounting, good fans.

Cons: fans are slightly louder at full speed than Noctua’s, and the finish is less premium.

Best budget overclocking cooler: Thermalright Peerless Assassin 120 SE

The Peerless Assassin 120 SE is a dual-tower cooler with two 120 mm fans, a 155 mm height and a 245 W rating from Thermalright. It is one of the most recommended budget coolers, and some outlets describe its performance as matching or beating coolers that cost several times more. It handles a moderate overclock on most mainstream chips comfortably.

Who it suits: budget builders who still want to overclock a six- or eight-core chip.

Pros: exceptional value, strong cooling, broad socket support.

Cons: it runs closer to its limit on the hottest 24-core Intel chips, and the fans get audible under load.

Quietest high-end option: be quiet! Dark Rock Pro 5

The be quiet! Dark Rock Pro 5 is a dual-tower cooler with a 270 W rating, a 120 mm fan in the center and a 135 mm fan on the outside. It is 168 mm tall and designed for low noise, with a focus on rigidity and a clean look in the case. It works well for overclocked mainstream chips where quiet operation matters.

Who it suits: builders who value low noise and a clean appearance along with strong cooling.

Pros: very quiet, high heat rating, solid build.

Cons: expensive for the cooling gained, and as large as the Noctua NH-D15 G2.

Best mid-range dual tower: DeepCool AK620

The DeepCool AK620 has a dual-tower design with two 120 mm fans, a 160 mm height and a 260 W rating from the maker. It balances cost, cooling and compatibility, and it has been a common recommendation for overclocked mainstream processors for several years. Its all-black finish suits many builds.

Who it suits: builders who want strong air cooling at a mid-range tier.

Pros: reliable cooling, reasonable noise, easy installation.

Cons: newer Thermalright models give more cooling per dollar.

Best for tighter cases: Noctua NH-U12A

The Noctua NH-U12A is a single-tower cooler with two 120 mm fans and a height of 158 mm. It has a smaller footprint than a dual-tower cooler, which leaves room for tall memory and clears more cases. It cools a moderately overclocked chip well but sits below the large dual towers on the hottest processors.

Who it suits: builders with a mid-size case or tall memory modules who want quiet, effective cooling.

Pros: strong cooling for its size, excellent noise levels, easy memory clearance.

Cons: premium pricing and less headroom for extreme overclocks.

Best compact value dual tower: Scythe Mugen 6

The Scythe Mugen 6 is a dual-tower cooler with a single 120 mm fan and a compact build aimed at a wide range of cases. Check Scythe’s specification sheet for its exact height and socket support before you buy. It offers solid cooling for a mildly overclocked six- or eight-core chip and keeps the price modest.

Who it suits: builders who want a dual-tower design in a smaller package.

Pros: good cooling for the size, simple installation.

Cons: a single fan limits the ceiling for heavy overclocks, and you may want to add a second fan.

Decision matrix: match the cooler to your processor and goal

How to choose a heatsink for overclocking

1. Estimate your heat load. Take the processor’s stock power, then plan for 30 to 60 percent more when overclocked. A chip at 125 W stock may reach about 160 to 200 W. Pick a cooler rated above that.
2. Confirm the socket. Check the cooler’s mounting hardware for your socket, such as AM5, LGA 1700 or LGA 1851. Some coolers ship with extra brackets or require a kit.
3. Measure the case. Compare the cooler height with your case’s CPU cooler clearance. Leave a few millimeters spare, since side panels can be tight.
4. Check memory clearance. A dual-tower cooler can overlap the first memory slot. Look for coolers that allow fan repositioning, or choose low-profile memory.
5. Consider airflow. The cooler needs a clear path for air. Make sure a case fan exhausts the heat the cooler pushes backward.
6. Consider noise. Overclocking often means the fans run at higher speeds. Larger fans move more air at lower speeds, which is why 140 mm designs tend to be quieter.

Worked example: sizing a cooler

Suppose you plan to overclock a processor whose stock heat output is 125 W. A 30 percent increase takes it to about 162 W, and a 60 percent increase takes it to about 200 W. The Peerless Assassin 120 SE, rated at 245 W, covers both figures with a margin of 45 to 83 W. If your chip instead draws 250 W at its limit, the same cooler is at its rated ceiling, and you would choose the Phantom Spirit 120 SE, the NH-D15 G2 or a 360 mm liquid cooler. A margin of at least 20 percent between the actual heat output and the cooler’s rating keeps fan speed, and therefore noise, lower under sustained load.

Installation and maintenance steps

1. Prepare the motherboard. Fit the backplate and standoffs for your socket before installing the board in the case, if the cooler requires it. This avoids having to remove the board later.
2. Apply thermal paste. Use a pea-sized dot in the center for a mainstream chip. The mounting pressure spreads it evenly. Large Intel and AMD chips with many chiplets may benefit from a slightly larger amount or a line pattern.
3. Mount the cooler evenly. Tighten the screws in a cross pattern, a little at a time, to keep pressure balanced. Stop when the springs bottom out.
4. Connect the fans. Plug the fans into the CPU fan header, and use a splitter if there are two fans on one header.
5. Set the fan curve. In the BIOS, create a curve that ramps the fans smoothly with temperature to avoid constant speed changes.
6. Clean on a schedule. Dust builds up in the fins over time. Blow it out every few months to keep temperatures down.

Common mistakes with overclocking coolers

• Buying a cooler by TDP rating alone and ignoring case clearance or memory fit.
• Overtightening the mounting screws, which can bend the processor or the motherboard.
• Forgetting that K-series Intel chips and X-series AMD chips ship without a cooler.
• Applying too much thermal paste, which can ooze onto the socket area.
• Blocking the cooler’s airflow with cables or a poorly placed case fan.
• Pushing voltage to chase a small clock gain, which raises temperatures sharply.

Cooling spec comparison: what the numbers mean

Heat pipe counts are taken from the manufacturers’ descriptions and may differ slightly between product revisions, so confirm them on the maker’s page. More heat pipes do not automatically mean better cooling, since fin area, fan pressure and base quality all contribute. Read the table as a guide to physical fit and noise rather than a ranking of temperatures.

Airflow, case and fan setup for an overclocked chip

A heatsink cannot cool a chip if the case traps hot air. Overclocking raises the heat that has to leave the case, so airflow deserves as much attention as the cooler.

• Front intake, rear and top exhaust. Air should travel in a straight path from the front fans, across the heatsink, and out the rear or top. Orient the cooler fans so they blow toward the rear exhaust fan.
• Positive pressure helps with dust. Running slightly more intake than exhaust pushes air out through gaps and keeps dust out of the case, provided the intake fans have filters.
• Mesh fronts beat solid panels. A case with a solid glass front and little intake area restricts airflow and can add several degrees to your processor temperature.
• Mind the graphics card. A hot graphics card dumps heat into the case, which raises the temperature of the air your cooler breathes. Good airflow serves both.
• Add a second fan where it helps. If your cooler ships with one fan, adding a second on the opposite side of the fin stack often cuts temperature by a few degrees at the same noise level.

Realistic overclocking expectations in 2026

It helps to know what you can actually gain before you spend money on cooling. Modern processors already boost close to their thermal and power limits, so manual all-core overclocks produce smaller gains than they once did. AMD’s cache-heavy Ryzen chips have restricted voltage limits, and the best results usually come from tuning the boost behaviour, such as using Precision Boost Overdrive with a negative curve optimizer setting, rather than fixing a high all-core clock. Intel’s unlocked chips offer more manual headroom, but power draw climbs steeply and temperatures follow.

That makes the cooler’s value clear: a better heatsink lets the processor hold its boost clocks for longer, and it gives you room to undervolt for lower temperatures at the same speed. For many owners, undervolting a high-end chip and pairing it with a quality air cooler gives a cooler, quieter system with the same or better performance than a heavy manual overclock.

Frequently Asked Questions

Can an air cooler handle an overclocked processor?

Yes, for most mainstream chips. A large dual-tower air cooler can handle a strong overclock on a six-, eight- or even sixteen-core processor. The hottest Intel chips at high overclocks benefit from a 360 mm liquid cooler.

Is the Noctua NH-D15 G2 worth the premium over a Thermalright cooler?

It is worth it if you value the lowest noise and the best mounting system, or you want a long warranty. If you care mostly about temperature per dollar, the Thermalright coolers deliver nearly the same cooling for less.

Does a bigger heatsink always cool better?

Not always. Fin density, heat pipe count, fan quality and contact with the processor lid all matter. A well-designed mid-size cooler can beat a poorly designed large one.

How much cooling do I need for a Ryzen 7 9800X3D?

The 9800X3D is efficient, and a good single-tower or dual-tower air cooler handles it well, even with a modest overclock or curve optimization.

Will a dual-tower cooler fit over my memory?

It depends on the cooler and the memory height. Check the maker’s clearance figures, and use low-profile memory if the outer fan overlaps the first slot.

Should I use a 120 mm or 140 mm fan?

A 140 mm fan moves more air at a given speed, so it is usually quieter for the same cooling. A 120 mm fan fits more cases and comes with most budget coolers.