Quick verdict
For the i7-8700K, a high-end air cooler like the Noctua NH-D15 offers the best balance of performance, noise, and reliability, while a 280mm AIO like the NZXT Kraken X63 provides superior cooling for overclocking enthusiasts.
Noctua NH-D15
The NH-D15 offers exceptional cooling performance rivaling many AIOs, with dual 140mm fans and a massive heatsink. Verified owners report idle temps around 30C and load temps under 70C even with overclocks. Its low noise and excellent build quality make it a top choice for air cooling.
The Noctua NH-D15 air cooler beats most AIOs for the i7-8700K, offering quiet, reliable performance. For heavy overclocking, a 280mm AIO like the Kraken X63 pulls ahead.
When I set out to find the best CPU cooler for the Intel i7-8700K, I knew this chip could run hot under load, especially if overclocked. I wanted a cooler that could handle its 95W TDP and boost frequencies without breaking the bank or being too loud. After comparing specs, reading many verified owner reviews, and checking compatibility standards, I narrowed down the top contenders. Here are my picks based on real-world performance data and user feedback.
I focused on coolers that fit LGA1151 sockets, have good clearance for RAM and cases, and offer a balance of cooling efficiency and noise. I avoided any claims of lab testing and instead relied on what owners consistently report: temperatures under stress, noise levels, and ease of installation. Whether you prefer air or liquid cooling, there’s an option here that will keep your 8700K cool.
How we test
I started by researching coolers compatible with LGA1151 and the i7-8700K's thermal characteristics. I cross-referenced manufacturer specs like TDP rating, fan size, and noise levels. Then I scoured verified owner reviews on major retail sites, focusing on thermal performance under load (e.g., Prime95, Cinebench), noise at idle and full speed, and installation difficulty. I also checked for common issues like RAM clearance or pump noise. From there, I selected five coolers that consistently had high satisfaction rates and met my criteria for value and performance.
At a glance
| Pick | Best for | Score | |
|---|---|---|---|
| Noctua NH-D15 | Best Overall | 9 | Check price |
| be quiet! Dark Rock Pro 4 | Best Silent Air Cooler | 9 | Check price |
| Corsair H100i RGB Platinum | Best 240mm AIO | 8 | Check price |
| Cooler Master Hyper 212 Black Edition | Best Budget Air Cooler | 8 | Check price |
| NZXT Kraken X63 | Best 280mm AIO | 9 | Check price |
The picks, reviewed
Noctua NH-D15
The NH-D15 offers exceptional cooling performance rivaling many AIOs, with dual 140mm fans and a massive heatsink. Verified owners report idle temps around 30C and load temps under 70C even with overclocks. Its low noise and excellent build quality make it a top choice for air cooling.
Reasons to buy
- Excellent cooling performance
- Very quiet operation
- High-quality build and long lifespan
Reasons to avoid
- Large size may not fit all cases
- Can interfere with tall RAM modules
- Installation can be tricky in tight spaces
be quiet! Dark Rock Pro 4
Owners consistently praise the Dark Rock Pro 4 for its near-silent operation even under load, with noise levels around 24.3 dBA. It cools the 8700K effectively, keeping temps below 75C in most scenarios. The all-black design and easy mounting system are also pluses.
Reasons to buy
- Extremely quiet
- Strong cooling performance
- Sleek, all-black design
Reasons to avoid
- Large and heavy
- RAM clearance limited to 40mm
- Not as effective as top-tier AIOs for extreme overclocking
Corsair H100i RGB Platinum
This 240mm AIO provides excellent cooling for the 8700K, with owners reporting load temps around 65C. The RGB lighting and Corsair iCUE software add customization. It's a solid choice for those wanting liquid cooling without the bulk of a 360mm.
Reasons to buy
- Good cooling performance
- RGB lighting and software control
- Easy installation
Reasons to avoid
- Pump noise can be noticeable
- Requires case with 240mm radiator support
- Slightly higher noise than air coolers at max fan speed
Cooler Master Hyper 212 Black Edition
The Hyper 212 Black Edition offers great value for the price, with owners noting it keeps the 8700K at stock speeds under 70C. It's compact, easy to install, and has a sleek black finish. While not for heavy overclocking, it's more than adequate for most users.
Reasons to buy
- Affordable
- Good performance for stock and mild overclocks
- Compact design fits most cases
Reasons to avoid
- Not suitable for heavy overclocking
- Single fan can be louder under load
- Build quality feels less premium
NZXT Kraken X63
The Kraken X63's 280mm radiator provides ample cooling, with owners seeing load temps around 60C on the 8700K. The RGB pump design and CAM software are user-friendly. It's a top performer for those wanting high-end liquid cooling with minimal noise.
Reasons to buy
- Excellent cooling performance
- Quiet operation
- Beautiful RGB pump design
Reasons to avoid
- Requires case with 280mm radiator support
- Higher price point
- Software can be buggy at times
What to look for
Cooler Type: Air vs. AIO
Air coolers are generally cheaper, quieter, and more reliable due to fewer moving parts. AIO liquid coolers offer better thermal performance, especially for overclocking, but can have pump noise and potential leakage risks. Consider your case size and whether you want to deal with radiator mounting.
Clearance and Compatibility
Check your case's CPU cooler height limit for air coolers (e.g., Noctua NH-D15 is 165mm tall). For AIOs, ensure your case supports the radiator size (240mm, 280mm, etc.) and that the pump block clears your RAM. Many coolers have offset designs for better RAM compatibility.
Noise Levels
If silence is a priority, look for coolers with larger fans (140mm) that move more air at lower RPMs. Verified owner reviews often mention noise at idle and under load. Be aware that pump noise in AIOs can be a concern; some users find it annoying.
Overclocking Headroom
For moderate overclocks (up to 4.8-5.0 GHz), a high-end air cooler like the NH-D15 or a 280mm AIO like the Kraken X63 is sufficient. For extreme overclocks, a 360mm AIO or custom loop may be needed. Check owner reports for specific overclocking results.
Our verdict
For the i7-8700K, a high-end air cooler like the Noctua NH-D15 offers the best balance of performance, noise, and reliability, while a 280mm AIO like the NZXT Kraken X63 provides superior cooling for overclocking enthusiasts.
FAQs
Yes, the i7-8700K does not include a stock cooler, so you must buy an aftermarket cooler. Even if it did, the stock cooler would be inadequate for this CPU's heat output, especially if overclocking.
Absolutely. High-end air coolers like the Noctua NH-D15 or be quiet! Dark Rock Pro 4 can handle the 8700K at stock speeds and moderate overclocks. They are often quieter and more reliable than AIOs.
A 240mm AIO is sufficient for stock and mild overclocks. For better thermal headroom and quieter operation, a 280mm AIO is recommended. 360mm AIOs are overkill unless you're doing extreme overclocking or want the lowest possible temps.
Check your case's CPU cooler clearance. Most mid-tower cases accommodate coolers up to 160-165mm. The Noctua NH-D15 is 165mm tall, so measure before buying. Also ensure your RAM height doesn't interfere; some coolers have cutouts for taller RAM.
How we made this guide
We compare every pick on the factors that matter, cross-checking manufacturer specifications against aggregated verified owner reviews. We rank independently and never take payment for placement. We have not personally tested every product; where we have not, the ranking reflects verified specs and owner feedback rather than a hands-on review.
How it was written: this guide was researched and reviewed by the TheTestedHub editorial team for accuracy.
Affiliate disclosure: TheTestedHub is reader-supported. When you buy through links on our site, we may earn a commission at no extra cost to you.
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