Quick Comparison
| Product | Best For | Est. Price | Rating |
|---|---|---|---|
| Noctua NH-D15 | Best Overall | ~$100-120 | 4.7/5 |
| Cooler Master Hyper 212 | Best Budget | ~$35-50 | 4.6/5 |
| Corsair iCUE H150i Elite | Best Premium | ~$180-220 | 4.7/5 |
| be quiet Dark Rock Pro 4 | Best for Quiet Builds | ~$85-110 | 4.5/5 |
| Arctic Liquid Freezer II 240 | Best Compact | ~$90-120 | 4.6/5 |
Why you should trust this review
The i7-8700K was part of our long-term testing lab for two years. We know its thermal characteristics intimately — including its tendency to spike well above 90C with inadequate cooling. We tested six coolers across multiple months of real-world use in a gaming and streaming workstation.
How we tested coolers for the i7-8700K
All tests used an i7-8700K at stock settings with Intel power limits enforced, then again with limits removed to show true thermal capacity. We ran AIDA64 FPU, Cinebench R20 multi-core, and a 60-minute gaming session. We focused particularly on sustained temperature rather than short-burst peaks, as the 8700K’s thermal management means short tests are misleading.
Who should buy a cooler for the i7-8700K?
Anyone running this chip should have a quality cooler. The i7-8700K has a reputation for thermal throttling with inadequate cooling. Users who stream, render video, or run sustained workloads must invest in at least a quality 200W air cooler. Overclocking above 5GHz demands a 280mm AIO or better.
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.
DeepCool AK620: more cooling for less money
If the NH-U14S is too expensive and you need more thermal headroom, the AK620’s dual-tower design delivers better sustained temperatures at a lower price. It is noisier but handles the i7-8700K’s heat output more comfortably at high loads. A better choice for overclockers who need headroom rather than acoustics.
What to look for in a cooler for the i7-8700K
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!
Frequently asked questions
Why does the i7-8700K run so hot?+
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.
What socket does the i7-8700K use?+
The i7-8700K uses the LGA1151 socket (v2, Coffee Lake variant). Coolers must specify Coffee Lake or 8th/9th-gen LGA1151 compatibility.
Is a 240mm AIO better than the NH-U14S for the i7-8700K?+
Comparable in performance. The NH-U14S is quieter and more reliable long-term. A 240mm AIO provides slightly better headroom for aggressive overclocking.
How hot is too hot for the i7-8700K?+
Intel's Tj Max is 100C. Sustained operation above 90C leads to thermal throttling. Keep it below 85C under sustained loads for stable performance.