An old Core i7-8700K or i9-9900K can still game well, but Intel shipped those K-series chips with no cooler in the box. Choosing among the best air CPU coolers for LGA 1151 means checking that the bracket still covers the 115x hole pattern and that the heatsink suits a 91W to 95W chip. Here are seven verified options.
Quick verdict
For most LGA 1151 builds, the Thermalright Phantom Spirit 120 SE is the cooler to buy: a 154mm dual tower with seven heat pipes and LGA 115x in its socket list, for well under $40. Go cheaper with the Assassin X 120R SE V2 for non-K chips, or step up to the Noctua NH-D15 for an overclocked i9-9900K.
| Cooler | Type | Height | Fans | LGA 1151 support | Best for | Amazon US price, Nov 2026 |
|---|---|---|---|---|---|---|
| Thermalright Phantom Spirit 120 SE | Dual tower, 7 pipes | 154mm | 2 x 120mm | Yes (115x) | Best overall for K-series | about $36 |
| Thermalright Assassin X 120R SE V2 | Single tower, 4 pipes | 148mm | 1 x 120mm | Yes (1151 listed) | 65W non-K chips | about $17 |
| Vetroo V5 | Single tower, 5 pipes | About 150mm (Amazon dimensions) | 1 x 120mm | Yes (115X) | Budget with ARGB | about $20 |
| be quiet! Pure Rock 3 Black | Slim single tower, 4 pipes | 154mm | 1 x 120mm | Yes (1151 listed) | Tall RAM, quiet brand | about $38 |
| Noctua NH-U12A | Single tower, 7 pipes | 158mm | 2 x 120mm | Yes (115x) | Quiet high-end single tower | about $110 |
| Noctua NH-D15 | Dual tower, 6 pipes | 165 to 168mm (sources differ) | 2 x 140mm | Yes (115x) | Overclocked i7 and i9 | about $110 |
| Noctua NH-L9x65 | Low profile | 65mm | 1 x 92mm slim | Yes (115x) | Slim and ITX builds | about $70 |
How we selected these LGA 1151 coolers
This is a research-based guide, not a lab test. We started from Amazon US results for LGA 1151, air and dual-tower cooler searches collected on November 11, 2026, kept models that list LGA 1151 or LGA 115x support, and confirmed heights, fans, heat pipes and warranty against manufacturer pages or established retailers.
Every pick also lists LGA 1700, LGA 1851, AM5 and AM4, so the cooler can move with you if you upgrade from a Skylake, Kaby Lake or Coffee Lake system. We covered budget towers, quiet premium towers, a large dual tower for overclocking and a low-profile option for small cases. Ranking follows verified specs and fit, never commission.
Prices and ratings are an Amazon US snapshot from November 2026. We did not include stock-style Intel coolers, because the chips most people are upgrading are K-series models that never came with one, and because a $17 tower is a much larger step up.
Best air CPU coolers for LGA 1151 reviewed
The seven picks are ordered by how well they suit typical 1151 builds. Each section covers who the cooler fits, the specs we verified, socket notes and trade-offs. If you run a non-K Core i5 or i7, the first three sections are usually enough; overclockers should read the Noctua sections.
Thermalright Phantom Spirit 120 SE
This is our top pick because it gives LGA 1151 K-series chips a seven-pipe dual tower at a budget price. It suits Core i7-8700K and i9-9900K owners at stock or mild overclocks, along with i5-8600K and i5-9600K builds, in any case with at least 154mm of clearance.
Thermalright lists the heatsink at 110 x 125 x 154mm with seven 6mm heat pipes and TL-C12B V2 120mm fans rated at 1,500 RPM. The Amazon listing confirms dual PWM fans rated at up to 66.17 CFM and 25.6 dBA each, and claims a 105W to 280W TDP range, which is a seller figure rather than a measured result.
Supported sockets are Intel LGA 1851, 1700, 1200 and 115x plus AM5 and AM4, so the 1151 bracket is in the box. It was listed around $36 on Amazon US and rated 4.8 out of 5 from about 1,000 ratings as of November 2026.
- Pro: seven heat pipes and two fans for under $40
- Pro: 154mm height fits most mid-towers
- Pro: also covers LGA 1700 and 1851 for a later upgrade
- Con: dual-tower width can crowd tall RAM
- Con: warranty length not stated on the pages we checked
Buy if you have a 95W K-series chip and a mid-tower. Skip if your case tops out below about 155mm, where the Assassin X 120R SE V2 or NH-L9x65 fit better.
Thermalright Assassin X 120R SE V2
The Assassin X 120R SE V2 is the budget pick for 65W LGA 1151 processors such as the Core i7-8700, which Intel rates at 65W TDP, and for replacing a worn or noisy Intel stock cooler. It also suits smaller cases, since it stands 148mm tall and only 71mm deep.
The listing gives 120 x 71 x 148mm, four 6mm heat pipes on a copper base and one TL-C12C-L V2 120mm PWM fan at 1,550 RPM, 66.17 CFM and 25.6 dBA with S-FDB bearings. The fan has RGB lighting, and the narrow body avoids blocking memory slots on most boards.
The listing names LGA 1150, 1151, 1155, 1156, 1200, 1700 and 1851 plus AM4 and AM5. It was listed around $17 on Amazon US and rated 4.7 out of 5 from about 180 ratings as of November 2026. With one fan and four pipes, it is not the choice for an overclocked 9900K.
- Pro: very low price with LGA 1151 named explicitly
- Pro: 148mm height and 71mm depth
- Pro: full RAM clearance on most boards
- Con: smaller ratings base than older Assassin X versions
- Con: limited headroom for overclocked K-series chips
Buy if you have a 65W non-K chip or a stock-clocked i5-K. Skip if you plan to overclock an i7 or i9, where a dual tower is safer.
Vetroo V5
The Vetroo V5 is the budget pick for buyers who want ARGB lighting and a fifth heat pipe. It suits gaming PCs with a Core i5 or i7 from the 6th to 9th generations, glass-panel cases and anyone who values a large owner base, since it has one of the biggest rating counts among budget coolers in our data.
The listing describes five direct-contact heat pipes, a 120mm FDB fan with 4-pin PWM control from 800 to 1,700 RPM and ARGB on a 5V 3-pin header. The spec table lists 52 CFM and 30.8 dB, and item dimensions of 5.83 x 5.04 x 2.95 inches, which suggests a height of roughly 148 to 150mm.
Sockets in the listing are Intel LGA 1851, 1700, 1200 and 115x plus AM5 and AM4. It was listed around $20 on Amazon US and rated 4.6 out of 5 from about 6,200 ratings as of November 2026. No manufacturer page confirmed height or warranty.
- Pro: five heat pipes and ARGB at about $20
- Pro: very large ratings base
- Pro: wide PWM speed range
- Con: height and warranty not confirmed by a manufacturer page
- Con: higher rated noise than the Thermalright single tower
Buy if you want lighting and a fifth pipe on a budget. Skip if documented specs matter more than looks.
be quiet! Pure Rock 3 Black
The Pure Rock 3 Black suits LGA 1151 owners with tall RAM or a crowded board, and buyers who prefer a quiet-focused brand with a stated warranty. Its slim body leaves memory slots clear, which helps on older Z170, Z270 and Z370 boards where the first DIMM slot often sits close to the socket.
The listing describes four black 6mm heat pipes and a Pure Wings 3 120mm PWM fan with a 190W rating, and says the slim design allows unlimited memory height. A review lists 71 x 124 x 154mm. The mounting bridge comes preinstalled, which simplifies installation on Intel boards.
The listing names Intel LGA 1851, 1700, 1200, 1151, 1150 and 1155 plus AM5 and AM4, and the review lists a 3-year warranty. It was listed around $38 on Amazon US and rated 4.5 out of 5 from about 500 ratings as of November 2026.
- Pro: unlimited RAM height
- Pro: LGA 1151 named explicitly
- Pro: 3-year warranty per review data
- Con: single fan and four pipes
- Con: costs about the same as the dual-tower Phantom Spirit
Buy if tall memory is your main constraint. Skip if it is not, because the Phantom Spirit gives more fin area for similar money.
Noctua NH-U12A
The NH-U12A is the quiet high-end single tower. It suits i7-8700K and i9-9900K owners who want strong cooling without the width of a dual tower, and who value Noctua’s mounting kit and long warranty, especially in cases where a 165mm-plus cooler will not fit.
Noctua’s listing describes seven heat pipes, two NF-A12x25 120mm PWM fans with Low-Noise Adaptors and a 158mm height, and says it does not overhang the RAM slots on LGA 115x or block the PCIe slot on most boards. NT-H1 paste and the SecuFirm2 mount are included.
Mounting covers LGA 1851, 1700, 1200 and 115x plus AM5 and AM4. Amazon lists a 6-year warranty, while one retailer page says five. It was listed around $110 on Amazon US and rated 4.8 out of 5 from about 3,700 ratings as of November 2026.
- Pro: seven pipes and two premium fans in a 158mm single tower
- Pro: no RAM overhang on LGA 115x
- Pro: large ratings base
- Con: about three times the Phantom Spirit’s price
- Con: warranty figures differ between sources
Buy if you want quiet, high-end cooling with full RAM clearance. Skip if budget matters, because the Phantom Spirit covers 95W chips for far less.
Noctua NH-D15
The NH-D15 is the pick for overclockers. An i9-9900K is rated at 95W TDP by Intel, but overclocking raises power well beyond that, and a large dual tower with two 140mm fans gives the most air-cooling headroom here. It suits full-size ATX cases with plenty of height and RAM space.
A Noctua retailer lists a 165mm height with two NF-A15 140mm fans, while the Amazon highlight says 168mm, so plan for 168mm. It has six heat pipes, NT-H1 paste and SecuFirm2 mounting with an offset option. Noctua’s listing positions it for overclocking or near-silent systems.
Mounting covers LGA 1851, 1700, 1200 and 115x plus AM5 and AM4, and the warranty is six years. It was listed around $110 on Amazon US and rated 4.8 out of 5 from about 11,600 ratings as of November 2026, the largest ratings base in this guide.
- Pro: most air-cooling headroom of the picks
- Pro: two 140mm fans for low-speed airflow
- Pro: 6-year warranty and a huge ratings base
- Con: needs about 168mm of clearance
- Con: dual 140mm towers can block tall RAM
Buy if you overclock a 1151 i7 or i9 and your case clears 168mm. Skip if your case is older or narrow; a Hardware Secrets review lists the Carbide 200R at only 160mm.
Noctua NH-L9x65
The NH-L9x65 is the low-profile pick for slim LGA 1151 desktops, HTPCs and ITX cases. It suits 65W chips such as the Core i7-8700 and lower-power Core i5 and i3 models, and builders who need a cooler under 70mm that does not cover the RAM or PCIe slots on a small board.
Noctua’s listing describes a 65mm total height, an NF-A9x14 slim 92mm PWM fan with Low-Noise Adaptor and a footprint that does not overhang RAM or PCIe on most current boards. It recommends the cooler for CPUs with low to moderate heat output, and includes NT-H1 paste and SecuFirm2 mounting.
Mounting covers LGA 1851, 1700, 1200 and 115x plus AM5 and AM4. It was listed around $70 on Amazon US and rated 4.7 out of 5 from about 3,000 ratings as of November 2026. Pair it with a 95W K-series chip only at stock and in a case with good airflow.
- Pro: 65mm height for slim cases
- Pro: no RAM or PCIe overhang
- Pro: large ratings base
- Con: limited capacity for K-series chips
- Con: premium price for a small cooler
Buy if your case cannot take a tower and your CPU is 65W. Skip if you have room for a 148mm tower, which gives more capacity for less money.
Buying guide
LGA 1151 platforms are now several generations old, so the checks are a little different from a new build. Confirm the cooler names LGA 1151 or 115x, match capacity to your chip’s rated power and overclocking plans, measure older cases carefully and think about whether you will carry the cooler to a newer socket.
LGA 1151 mounting and the 115x pattern
LGA 1150, 1151, 1155, 1156 and 1200 all use the same 75 x 75mm cooler hole pattern, which is why coolers list them together as LGA 115x or 1200. LGA 1700 and 1851 moved to 78 x 78mm, so a cooler built only for newer Intel boards may not include the older bracket.
Every pick here lists LGA 115x or 1151 explicitly, but check the box contents of the exact variant you buy. Most of these coolers use a backplate that goes behind the motherboard, so you will need to remove the board or use a case with a CPU cutout to fit it.
Choosing the best air CPU coolers for LGA 1151 by CPU
Start with the rated power of your exact chip. Intel rates the Core i7-6700K and i7-7700K at 91W TDP and the i7-8700K and i9-9900K at 95W, while the Core i7-8700 is 65W. K-series chips from these generations ship without a fan or heatsink, so they always need an aftermarket cooler.
As a practical rule, 65W non-K chips are well served by the Assassin X 120R SE V2, Vetroo V5 or NH-L9x65. 91W to 95W K-series chips at stock suit the Phantom Spirit, Pure Rock 3 or NH-U12A. For an overclocked i7-8700K or i9-9900K, the NH-D15 gives the most headroom.
Case clearance in older cases
Many cases sold alongside 1151 boards are narrower than current designs. A Hardware Secrets review lists the Corsair Carbide 200R at 160mm, which fits every pick except the NH-D15. Corsair lists the newer 4000D Airflow at 170mm, which fits all of them.
Case specs are not always accurate. A Noctua study reported by The FPS Review in August 2026 found more than half of 100-plus measured cases deviated significantly from listed cooler clearance. Measure your own case if possible and leave a few millimeters of margin.
Planning for an upgrade
All seven picks also list LGA 1700, LGA 1851, AM5 and AM4, so a cooler bought for an 1151 system can move to a newer build. That matters if you plan to upgrade within a few years, because it turns the cooler into a long-term part rather than a one-off fix.
Newer chips draw more power, though. Intel rates the Core i9-14900K at 253W maximum turbo power, far above the 95W of a 9900K. If you expect to move to a high-end current chip, the NH-D15 or Phantom Spirit will be more useful later than a single tower.
FAQ
These answers cover common questions from owners of 6th to 9th generation Intel systems. They draw on Intel’s spec pages and the cooler specs above, so they apply to these chips and coolers specifically, rather than to every LGA 1151 product that might appear in a search.
Will an LGA 1200 or LGA 1700 cooler fit LGA 1151?
Yes for LGA 1200 coolers, because LGA 1151 and LGA 1200 share the same 75 x 75mm hole pattern. LGA 1700 and 1851 use 78 x 78mm, so a cooler built only for those sockets may not include the right bracket. All seven picks here list LGA 115x or 1151 explicitly.
Does the i9-9900K come with a cooler?
No. Intel’s spec page lists the boxed i9-9900K without a fan or heatsink, and the same applies to the i7-8700K, i7-6700K and other K-series chips from these generations. Budget at least $17 for a basic tower or around $36 for a dual tower like the Phantom Spirit.
Do I need a dual tower for an i7-8700K?
Not at stock. Intel rates it at 95W TDP, which a good single tower such as the Pure Rock 3 can handle. A dual tower like the Phantom Spirit gives more headroom for longer all-core loads or mild overclocking, and costs about the same in our November 2026 snapshot.
Conclusion
Buy the Thermalright Phantom Spirit 120 SE. It is the best LGA 1151 air cooler for most builds: a 154mm dual tower with seven heat pipes, two fans and the 115x bracket for about $36. Choose the Assassin X 120R SE V2 only for 65W non-K chips, and the NH-D15 only for an overclocked i9-9900K in a roomy case.
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