The Core i7-6700 is a locked 65W Skylake quad core that shipped with an Intel box cooler, often the loudest part of the PC under load. This guide to the best CPU coolers for i7 6700 systems picks six quiet replacements for LGA 1151, from a $16 tower to a 65mm slim cooler, without paying for headroom you cannot use.
Quick verdict
The Thermalright Assassin X120 Refined SE is the best upgrade for most i7-6700 PCs: a 148mm single tower with a 120mm PWM fan, LGA 115x support and about 1,900 Amazon ratings for around $16. If you want a longer warranty and quieter fan, the Noctua NH-U12S chromax.black is the premium pick, and the NH-L9x65 suits slim cases.
| Cooler | Type | Height | Fan | LGA 1151 listed | Best for | Amazon US, Nov 2026 |
|---|---|---|---|---|---|---|
| Thermalright Assassin X120 Refined SE | Single-tower air | 148mm | 1 x 120mm | Yes (115x) | Best value | about $16 |
| Cooler Master Hyper 212 Spectrum V3 | Single-tower air | 152mm | 1 x 120mm ARGB | Yes | Lighting on a budget | about $20 |
| be quiet! Pure Rock 3 Black | Single-tower air | 154mm | 1 x 120mm | Yes | Quiet, all-black | about $38 |
| Thermalright Peerless Assassin 120 Mini Black | Compact dual tower | about 125mm | 1 x 120mm | Yes | Small towers | about $34 |
| Noctua NH-U12S chromax.black | Single-tower air | 158mm | 1 x 120mm | Yes | Quietest tower, warranty | about $100 |
| Noctua NH-L9x65 | Low-profile air | 65mm | 1 x 92mm slim | Yes (115x) | Slim cases | about $70 |
How we selected quiet coolers for the i7-6700
Intel’s specification page lists the i7-6700 with four cores and eight threads, 3.4GHz base and 4.0GHz turbo clocks, a 65W TDP, a 71°C Tcase and the FCLGA1151 socket, launched in the third quarter of 2015. Intel also lists a boxed thermal solution, part E97379, so most retail i7-6700 chips came with a cooler.
The chip is locked, so overclocking headroom is not the goal. We chose coolers that handle a 65W eight-thread chip at lower fan speeds than a small stock cooler, list LGA 1151 or LGA 115x, and have published heights and meaningful Amazon rating counts. This is a research roundup based on spec pages and Amazon US data from November 2026; we did not measure noise or temperatures ourselves.
Many i7-6700 systems are office or family PCs, so the list spans a budget tower, a lighting option, two quiet premium choices, a compact tower for small cases and a slim cooler. Our i7-6700K guide covers the unlocked chip and its needs, so only one model, the Pure Rock 3 Black, appears in both lists.
Best CPU coolers for i7 6700 upgrades, reviewed
Each review below explains which build the cooler suits, the verified specs, the Amazon rating snapshot and the trade-offs. Ratings and prices are November 2026 snapshots and will move. Heights are total cooler height unless stated, and all six picks also list newer Intel sockets for later reuse.
Thermalright Assassin X120 Refined SE
The Assassin X120 Refined SE is the best value upgrade for an i7-6700. Thermalright’s page lists a 148mm height, four 6mm heat pipes, one TL-C12C 120mm PWM fan at 1550 RPM and Intel 115x, 1200, 1700 and 1851 plus AM4 and AM5. The Amazon listing gives 125 x 71 x 148mm, a 645g weight and a 25.6 dB fan rating.
A 120mm fan on a four-pipe tower can spin far slower than a small box cooler for the same 65W load, which is where the noise reduction comes from. Its 71mm depth leaves all RAM slots clear on standard boards, and 148mm suits most mid towers.
It was rated 4.7 out of 5 from about 1,860 Amazon ratings and listed around $16 on Amazon US as of November 2026. Thermalright does not state a warranty length on the page, the main downside at this price.
- Pro: very low price with a large review base
- Pro: full RAM clearance and broad socket list
- Con: no stated warranty length
- Con: plain look with no lighting
Buy it if you want the cheapest meaningful noise upgrade. Skip it if you need a published warranty.
Cooler Master Hyper 212 Spectrum V3
The Hyper 212 Spectrum V3 suits i7-6700 owners who want ARGB lighting on a budget. Cooler Master’s official page lists 124 x 73 x 152mm, four nickel-plated direct-contact heat pipes, one 120mm ARGB fan at 650 to 1750 RPM, 71.93 CFM and 27.2 dBA, a two-year warranty, and Intel LGA 1851, 1700, 1200, 1151, 1150, 1155 and 1156 plus AM5 and AM4.
Its fan range starts low, so it can idle very quietly in office use. ARGB needs a 5V 3-pin header, which some older LGA 1151 boards lack; without one, the cooler still works, just without lighting.
It was rated 4.7 out of 5 from about 1,000 Amazon ratings and listed around $20 on Amazon US as of November 2026. It is a close match for the Assassin X120 in capability, so choose based on lighting and the published two-year warranty.
- Pro: ARGB and a published two-year warranty
- Pro: low minimum fan speed for quiet idle
- Con: lighting needs a 5V ARGB header
- Con: slightly taller than the Assassin X120
Buy it if you want lighting and a warranty for about $20. Skip it if your board has no ARGB header and you would rather save $4.
be quiet! Pure Rock 3 Black
The Pure Rock 3 Black is for quiet, all-black builds. A published spec list gives 71 x 124 x 154mm without mounting parts, one Pure Wings 3 120mm PWM fan, a 190W rating and a three-year warranty. The Amazon listing names Intel 1851, 1700, 1200, 1151, 1150 and 1155 plus AM5 and AM4, and describes four black 6mm heat pipes.
A 65W i7-6700 sits well below the cooler’s rating, so its fan should run slowly in normal use. The slim body leaves all memory slots usable, and the preinstalled mounting bridge described in the listing simplifies installation.
It was rated 4.5 out of 5 from about 500 Amazon ratings and listed around $38 on Amazon US as of November 2026. The spec table lists 2000 RPM and 34.8 dB at maximum, so set a sensible fan curve to keep it quiet under load.
- Pro: three-year warranty and explicit LGA 1151 support
- Pro: all-black finish with full RAM clearance
- Con: costs more than towers with similar capacity
- Con: high rated maximum fan noise
Buy it if you want an all-black tower with a warranty. Skip it if price matters most.
Thermalright Peerless Assassin 120 Mini Black
The PA120 Mini Black is for small towers that cannot take a 150mm cooler. The Amazon listing describes a compact dual-tower design with six heat pipes, a 120mm PWM fan at 1500 RPM, a blackened finish and a socket list of Intel LGA 1150, 1151, 1155, 1156, 1200, 1700 and 1851 plus AM4 and AM5. Its dimension fields give about 110 x 135 x 125mm.
Six heat pipes in a roughly 125mm cooler is generous for a 65W chip, letting the single fan run slowly. The listing’s title also mentions LGA 2011, but its compatibility bullet does not, so rely on the LGA 1151 support that both agree on.
It was rated 4.6 out of 5 from about 170 Amazon ratings and listed around $34 on Amazon US as of November 2026. Its review base is smaller than the others here, and Thermalright’s own page was not part of our checks, so treat the height as approximate.
- Pro: six heat pipes in a compact body
- Pro: fits small towers and micro-ATX cases
- Con: height from listing only
- Con: smaller review base
Buy it if your case allows about 130mm. Skip it if you have room for a standard tower.
Noctua NH-U12S chromax.black
The NH-U12S chromax.black is the premium quiet choice. The Amazon listing gives a 158mm height, five heat pipes, an NF-F12 120mm PWM fan with a Low-Noise Adaptor, a six-year warranty, and a socket field naming Intel LGA 1851, 1700, 1200, 1156, 1155, 1151 and 1150 plus AM5 and AM4.
With a 65W load, its fan can run near its low end most of the time, and the Low-Noise Adaptor caps speed further. It does not overhang RAM and does not block the top PCIe slot on most ATX and micro-ATX boards, per the listing.
It was rated 4.9 out of 5 from about 5,800 Amazon ratings and listed around $100 on Amazon US as of November 2026, the highest rating here. Its price only makes sense if you will move it to a future build, which its socket list allows.
- Pro: six-year warranty and top Amazon rating
- Pro: Low-Noise Adaptor for very quiet operation
- Con: expensive for a 65W chip
- Con: 158mm height is the tallest here
Buy it if you want the quietest tower and plan to reuse it. Skip it if this PC is near the end of its life.
Noctua NH-L9x65
The NH-L9x65 is for slim and small-form-factor i7-6700 builds. Noctua’s listing gives a 65mm height, an NF-A9x14 92mm slim PWM fan rated up to 2500 RPM and 23.6 dB, SecuFirm2 mounting for LGA 1851, 1700, 1200 and 115x plus AM5 and AM4, and a six-year warranty.
Noctua recommends it for low to moderate heat output, which suits a 65W i7-6700. Its 92mm fan works harder under long all-core loads than a tower would, so in a slim case good airflow matters, but it is a real step up from a stock cooler in tight spaces.
It was rated 4.7 out of 5 from about 3,000 Amazon ratings and listed around $70 on Amazon US as of November 2026. It does not overhang RAM or PCIe slots, per the listing.
- Pro: 65mm height for slim cases
- Pro: six-year warranty and newer socket support
- Con: works harder under sustained load than a tower
- Con: expensive for its size
Buy it if your case is too slim for a tower. Skip it if a 148mm tower fits.
Buying guide for an i7-6700 cooler
A locked 65W chip makes cooling capacity easy, so the decision rests on noise, fit and future reuse. The sections below cover why the stock cooler is loud, how to check clearance, LGA 1151 mounting and fan settings, so you get a quieter PC without overspending on a chip that cannot overclock.
Why the stock cooler gets loud
Intel’s boxed coolers are compact, so their small fans must spin fast to move the heat an eight-thread chip produces under load. A 120mm tower spreads the same heat over more fin area and heat pipes, letting a larger fan run slower and quieter for the same load.
That is why even the $16 Assassin X120 Refined SE is a real upgrade for an i7-6700. You are buying lower noise and steadier boost behavior, not the ability to overclock, since the chip’s multiplier is locked.
Check clearance and RAM
Heights here run from 65mm to 158mm. Measure from the motherboard surface to the side panel and allow a few millimeters of spare room for cables; a report on Noctua’s survey of over 100 cases found more than half did not match their listed clearance.
All six picks are single towers or slim coolers that avoid most RAM conflicts. The PA120 Mini Black is the only dual-tower layout, and it is compact, but check DIMM height if your memory has tall heat spreaders.
LGA 1151 mounting
LGA 1151 uses a 75 x 75mm hole pattern shared with LGA 1150, 1155, 1156 and 1200, so any cooler listing LGA 115x should include the right backplate and standoffs. Coolers that list only LGA 1700 and LGA 1851, such as the ARCTIC Freezer 36, will not fit without a separate kit.
Many i7-6700 PCs are prebuilt. Some prebuilt desktops use non-standard mounts or fan connectors, so check the board and case before ordering a retail cooler for an office machine.
Fan curves for quiet use
All six coolers use PWM fans, so the motherboard can slow them at idle. Set the CPU fan curve in the BIOS to stay low until the processor is under sustained load, which keeps short turbo bursts from revving the fan every time you open a program or a web page.
With a 65W chip and a 120mm tower, many systems can run the fan near its minimum during browsing, office work and video, which is the real benefit of upgrading from a stock cooler.
FAQ
These answers cover common i7-6700 cooler questions, from whether the stock cooler is enough to whether a slim cooler can keep up. They rely on Intel’s spec page and the manufacturer and Amazon data cited above, without our own temperature or noise measurements.
Is the i7-6700 stock cooler good enough?
It keeps the chip within Intel’s spec, since Intel designed and bundled it for this 65W processor. The problem is noise: a small fan has to spin fast under load. A $16 to $20 tower such as the Assassin X120 Refined SE or Hyper 212 Spectrum V3 is usually much quieter for the same work.
Do the best CPU coolers for i7 6700 help with gaming performance?
Only a little, and indirectly. A better cooler can help the chip hold its 4.0GHz turbo longer under sustained loads, but it cannot raise clocks beyond Intel’s limits on this locked processor. The main benefit is lower noise, which matters most during long gaming sessions.
Can I overclock an i7-6700 with a better cooler?
No, not in the usual way. The i7-6700 has a locked multiplier, unlike the i7-6700K. A better cooler improves noise and helps sustain turbo, but if you want to overclock, you need the K model and a board that supports overclocking. That is why these picks focus on quiet rather than headroom.
Conclusion
Buy the Thermalright Assassin X120 Refined SE for an i7-6700. It replaces the loud stock cooler with a 148mm tower and slow-spinning 120mm fan, fits LGA 1151, and costs about $16. Choose the Noctua NH-U12S chromax.black only if you want the quietest option with a six-year warranty, and the NH-L9x65 only for slim cases.
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