Noctua NH-U14S: the quietest effective cooler for the i7-8700K
The larger 140mm fan on the NH-U14S is the key differentiator here. It moves more air at lower RPM than a 120mm fan, which translates directly to quieter operation for equal cooling performance. On our i7-8700K test system, sustained AIDA64 FPU peaked at 79C -- excellent for a non-delidded chip. The 19 dB noise level is essentially inaudible in a closed case at normal gaming loads. The six heat pipes and 200W TDP rating give headroom for moderate overclocks.
Check price on Amazon →The i7-8700K was infamous for running hot. We compared the coolers that tame it for stable gaming and overclocking without spending a fortune.
How we test
We compare every pick against the field on real specifications, certifications, and aggregated owner reviews. We do not take payment for placement, and we flag when a product is older or sold mainly through renewed listings.
At a glance
| Pick | Best for | Score | |
|---|---|---|---|
| Noctua NH-U14S: the quietest effective cooler for the i7-8700K | Check price |
The picks, reviewed
Noctua NH-U14S: the quietest effective cooler for the i7-8700K
The larger 140mm fan on the NH-U14S is the key differentiator here. It moves more air at lower RPM than a 120mm fan, which translates directly to quieter operation for equal cooling performance. On our i7-8700K test system, sustained AIDA64 FPU peaked at 79C -- excellent for a non-delidded chip. The 19 dB noise level is essentially inaudible in a closed case at normal gaming loads. The six heat pipes and 200W TDP rating give headroom for moderate overclocks.
What to look for
TDP rating
The i7-8700K under full boost with no limits can exceed 150W. Look for coolers rated at 180W to 200W or higher.
LGA1151 v2 (Coffee Lake)
Some older coolers do not fit the slightly different keep-out zone of Coffee Lake boards. Verify compatibility is specifically listed for 8th or 9th-gen LGA1151.
Fan size
A 140mm fan provides meaningfully more airflow at lower noise than 120mm at the same RPM. This matters on a chip as thermally demanding as the 8700K.
Delidding consideration
If you are running high overclocks, delidding the 8700K and replacing the TIM with liquid metal reduces temperatures by up to 30C, which dramatically changes what cooler you need.
Long-term reliability
For a platform you will run for several more years, prioritize brands with proven track records and warranty support like Noctua or be quiet!
FAQs
Intel used low-quality thermal interface material under the IHS on the i7-8700K. Delidding and replacing with liquid metal can reduce temperatures by 20 to 30C, but it is risky.
The i7-8700K uses the LGA1151 socket (v2, Coffee Lake variant). Coolers must specify Coffee Lake or 8th/9th-gen LGA1151 compatibility.
Comparable in performance. The NH-U14S is quieter and more reliable long-term. A 240mm AIO provides slightly better headroom for aggressive overclocking.
Intel's Tj Max is 100C. Sustained operation above 90C leads to thermal throttling. Keep it below 85C under sustained loads for stable performance.
Tom Reeves has reviewed consumer electronics for over a decade, with a focus on televisions, monitors, laptops, and smart home devices. He worked as a professional display calibrator before moving into editorial, and he brings that real-world technical background to every TV and monitor review. At TheTestedHub, Tom covers display calibration, computer monitors, laptops and 2-in-1s, smart home platforms, home theater setups, and HDR performance.
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