The Core i7-7800X is a six-core Skylake-X chip for X299 boards, rated at 140W and sold without a cooler, and its LGA 2066 socket rules out many current coolers. This guide to the best CPU coolers for i7 7800X builds lists seven options that name LGA 2066 support, from a budget top-flow cooler to a 360mm AIO.
Quick verdict
The Thermalright Peerless Assassin 120 is the best overall pick for an i7-7800X: Thermalright’s page lists LGA 2066, it is a 157mm dual tower with six heat pipes and two fans, and it costs about $36. For overclocking, the ARCTIC Liquid Freezer II 280 A-RGB lists LGA 2066 and adds radiator area, and the SI-100 Black helps X299 VRMs in low cases.
| Cooler | Type | Height or radiator | LGA 2066 listed | Best for | Amazon US, Nov 2026 |
|---|---|---|---|---|---|
| Thermalright Peerless Assassin 120 | Dual-tower air | 157mm | Yes (maker page) | Best overall | about $36 |
| ARCTIC Liquid Freezer II 280 A-RGB | 280mm AIO | 280mm radiator | Yes (spec field) | Overclocking | about $100 |
| be quiet! Pure Loop 2 FX 360 | 360mm AIO | 360mm radiator | Yes | Most radiator per dollar | about $70 |
| Cooler Master MasterLiquid ML240L RGB V2 | 240mm AIO | 277 x 119.6 x 27.2mm | Yes | Proven 240mm AIO | about $90 |
| Noctua NH-D15S chromax.black | Asymmetric dual tower | 160mm | With NM-i20xx kit | Quiet premium air | about $110 |
| Thermalright SI-100 Black | Top-flow air | 74.8mm heatsink | Yes (maker page) | VRM airflow, low cases | about $27 |
| Thermalright FW 240 SE ARGB Black | 240mm AIO with LCD | about 277mm long | Yes (listing) | Budget AIO with screen | about $59 |
How we selected coolers for the i7-7800X
Intel’s specification page lists the i7-7800X with six cores and 12 threads, 3.5GHz base and 4.0GHz turbo clocks, a 140W TDP, a 100°C junction limit and the FCLGA2066 socket, launched in the second quarter of 2017. Intel notes the boxed processor includes no fan or heatsink, and lists its thermal spec as PCG 2017X.
The socket is the first filter. Many popular coolers now list only LGA 1851, 1700, 1200 and 115x, so every pick here names LGA 2066 on its maker page, Amazon listing or spec table. We then checked heights, radiator sizes and Amazon rating counts. This is a research roundup from spec pages and Amazon US data collected in November 2026; we quote no temperatures from our own testing.
A 140W six-core on X299 also puts load on the board’s VRMs, and AIOs remove the airflow a tower or top-flow cooler would otherwise provide around the socket. The list therefore balances dual towers, AIOs and one top-flow design, and explains the trade-offs of each.
Best CPU coolers for i7 7800X builds, reviewed
Each review covers the X299 build the cooler suits, its verified specs, the Amazon rating snapshot and its limits. Ratings and prices are November 2026 snapshots and will move. Where LGA 2066 support appears only in a listing title or spec field, we say so, and you should confirm the X299 hardware is in the box.
Thermalright Peerless Assassin 120
The standard Peerless Assassin 120 is our top pick. Thermalright’s page lists Intel 115x, 2011, 2011-3, 2066, 1200, 1700 and 1851 plus AM4 and AM5, with 125 x 135 x 157mm dimensions, a 750g weight, six 6mm heat pipes and TL-C12 120mm fans rated at 1550 RPM, 25.6 dBA and 66.17 CFM. The Amazon listing names dual 120mm PWM fans.
A six-pipe dual tower gives a stock 140W six-core real margin at low fan speeds, and the front fan pushes some air across the socket area. Buy the standard model: the better-known Peerless Assassin 120 SE’s page lists no LGA 2066 support.
It was rated 4.7 out of 5 from about 190 Amazon ratings and listed around $36 on Amazon US as of November 2026. X299 boards often have DIMM slots on both sides of the socket, so check RAM height against the towers.
- Pro: LGA 2066 confirmed on the maker page
- Pro: dual tower and two fans for about $36
- Con: easy to confuse with the SE, which lacks LGA 2066
- Con: no warranty length stated
Buy it if you want the best value air cooler for an i7-7800X. Skip it if your case is under 160mm.
ARCTIC Liquid Freezer II 280 A-RGB
The Liquid Freezer II 280 A-RGB is the overclocking pick. Its Amazon listing gives fan speeds of 200 to 1900 RPM, a PWM-controlled pump, 24 digital A-RGB LEDs and fan cables routed inside the hose sleeve, and its compatibility field lists Intel 1150, 1151, 1155, 1156, 1200, 1700, 2011(-3) and 2066 plus AM4 and AM5.
A 280mm radiator offers more area than a 240mm unit for an overclocked six-core. ARCTIC’s current Liquid Freezer III, by contrast, lists LGA 1700 and 1851 plus an optional kit for LGA 1200 and 115x, with no LGA 2066, which is why the older II series is the ARCTIC choice here.
It was rated 4.4 out of 5 from about 750 Amazon ratings and listed around $100 on Amazon US as of November 2026. We found no ARCTIC page confirming current availability or warranty, so check the seller’s terms.
- Pro: LGA 2066 listed with integrated cable routing
- Pro: 280mm radiator for overclocking headroom
- Con: older generation with unconfirmed warranty
- Con: needs a 280mm mount
Buy it if your case has a 280mm mount and you plan to overclock. Skip it if your case only takes 240mm.
be quiet! Pure Loop 2 FX 360
The Pure Loop 2 FX 360 gives the most radiator per dollar. Its Amazon listing lists Intel 1700, 1200, 2066, 1150, 1151, 1155 and 2011(-3) Square ILM plus AM5 and AM4, three Light Wings 120mm PWM high-speed fans, a doubly decoupled PWM pump and an ARGB-PWM hub for up to six devices.
Three 120mm fans on a 360mm radiator let a 140W chip run with slow fans, and the hub simplifies wiring on X299 boards with many components. A review of the Pure Loop 2 line describes a radiator refill port. The Amazon spec table lists a one-year warranty, which we could not confirm with be quiet!.
It was rated 4.6 out of 5 from about 590 Amazon ratings and listed around $70 on Amazon US as of November 2026. You need a 360mm top or front mount.
- Pro: explicit LGA 2066 support
- Pro: 360mm radiator for about $70
- Con: needs a 360mm mount
- Con: warranty term unclear
Buy it if your case takes 360mm. Skip it if it does not.
Cooler Master MasterLiquid ML240L RGB V2
The ML240L RGB V2 is the safe 240mm choice. Its Amazon listing gives a 277 x 119.6 x 27.2mm radiator, a third-generation dual-chamber pump and two SickleFlow 120mm RGB PWM fans, with Intel LGA 2066, 2011-v3, 2011, 1366, 1200 and 115x plus AMD AM4 listed. LGA 1700 needs a separately sold kit.
Its 240mm radiator fits more cases than 280mm and 360mm units, and it clears the space around the socket and both banks of DIMMs. It suits a stock or moderately overclocked 7800X.
It was rated 4.6 out of 5 from about 9,600 Amazon ratings and listed around $90 on Amazon US as of November 2026, the most reviewed cooler here.
- Pro: explicit LGA 2066 support and huge review base
- Pro: 240mm fits most cases
- Con: less headroom than larger radiators
- Con: price close to the 280mm Freezer II
Buy it if your case only takes 240mm. Skip it if a larger radiator fits.
Noctua NH-D15S chromax.black
The NH-D15S chromax.black is the quiet premium air option, with one condition. Noctua’s listing describes a 160mm asymmetric single-fan dual tower with 65mm RAM clearance, one NF-A15 140mm fan with a Low-Noise Adaptor, NT-H1 paste and a six-year warranty.
Its compatibility table lists LGA20xx Square ILM as supported with the NM-i20xx kit and Narrow ILM as unsupported. X299 desktop boards use the square ILM, so you need that kit, whose availability we did not confirm. Its asymmetric layout keeps the top PCIe slot clear on most ATX boards, per the listing.
It was rated 4.8 out of 5 from about 2,100 Amazon ratings and listed around $110 on Amazon US as of November 2026.
- Pro: large 140mm fan for quiet operation
- Pro: 65mm RAM clearance and six-year warranty
- Con: needs the separate NM-i20xx kit for LGA 2066
- Con: expensive and large
Buy it if you can get the kit and want near-silent air cooling. Skip it if you want LGA 2066 hardware in the box.
Thermalright SI-100 Black
The SI-100 Black is the top-flow choice for low cases and warm X299 VRMs. Thermalright’s page lists a 120 x 108 x 74.8mm heatsink, a 490g weight with fan, six 6mm heat pipes on a nickel-plated C1100 copper base, a TL-E12B 120mm fan rated at 2000 RPM, 27.7 dBA and 72.37 CFM, and Intel 115x, 1200, 1700, 1851, 2011 and 2066 plus AM4 and AM5.
Its downward airflow cools the socket area as well as the CPU, which can help VRM heatsinks under a 140W load. It has less fin area than the dual towers, so it suits stock settings or a mild overclock.
It was rated 4.5 out of 5 from about 110 Amazon ratings and listed around $27 on Amazon US as of November 2026. Add the 25mm fan to the heatsink height when checking clearance, since the total is not stated.
- Pro: LGA 2066 on the maker page
- Pro: airflow over VRMs
- Con: less headroom than dual towers
- Con: small review base, no stated warranty
Buy it if your case is low or your board’s VRM runs hot. Skip it for heavy overclocking.
Thermalright FW 240 SE ARGB Black
The FW 240 SE ARGB Black is the budget AIO with a screen. Its Amazon listing describes a 320 x 240 IPS LCD that attaches magnetically, and lists AMD AM4 and AM5 plus Intel LGA 1150, 1151, 1155, 1156, 1200, 2011, 2066, 1700 and 1851, with mounting hardware for each platform.
The listing title says 360mm, but its 10.91-inch length matches a 240mm radiator. Fan and pump figures are not clearly stated in the data we checked, so this ranks below the ML240L RGB V2 despite a lower price.
It was rated 4.4 out of 5 from about 165 Amazon ratings and listed around $59 on Amazon US as of November 2026.
- Pro: LCD and LGA 2066 support for under $60
- Pro: mounting hardware for many platforms
- Con: confusing title and unverified fan and pump specs
- Con: small review base
Buy it if you want a screen on a budget. Skip it if you want documented specs.
Buying guide for an i7-7800X cooler
X299 cooling has three special concerns: the LGA 2066 socket, VRM heat and DIMM slots on both sides of the socket. The checks below cover those, plus radiator sizing and fan control, so you can choose a cooler that fits the board, the case and your overclocking plans.
Confirm LGA 2066 hardware
LGA 2066 uses a square independent loading mechanism like X99’s LGA 2011-3, and coolers need matching studs or brackets for it rather than a mainstream backplate. Noctua’s spec table, for example, separates Square ILM, supported with a kit, from Narrow ILM, which it does not support.
Many popular coolers, including the Peerless Assassin 120 SE, list no LGA 2066 support. Check the maker page or listing, then confirm the X299 parts are in the box before removing your old cooler.
Think about VRM heat
A 140W six-core puts real load on the motherboard’s VRMs, especially when overclocked, and X299 boards rely on heatsinks and case airflow to keep them in check. Tower and top-flow coolers move some air across the socket area as a side effect, while AIOs do not.
If you choose an AIO, set up good case airflow with a front intake and a rear or top exhaust. The SI-100’s top-flow design is the most direct way to add airflow over VRMs.
Radiator size and case fit
Radiators here run from 240mm to 360mm, and towers from the low SI-100 to 160mm for the NH-D15S. A report on Noctua’s survey of over 100 cases found more than half deviated from their listed cooler clearance, so measure your own case with the side panel removed before ordering.
Check radiator mounts and fan thickness before you order. Not every case has a 280mm or 360mm mount, and a top radiator can collide with tall RAM or the board’s VRM heatsink.
Fan and pump control
Use PWM control and a fan curve that stays low until the chip is under sustained load. A six-core chip’s short turbo bursts do not need full fan speed, and a gentle curve stops the fans revving every time you open an application or start a short task.
For AIOs, follow the manual on pump headers, and use the Pure Loop 2 FX 360’s hub or the Freezer II’s single cable to reduce clutter.
FAQ
These answers cover the questions i7-7800X owners ask most about cooler support, AIO versus air and VRM cooling on X299. They rely on Intel’s spec page and the maker and Amazon data cited above, with no temperatures or benchmark results from our own testing.
Does the i7-7800X come with a cooler?
No. Intel’s specification page states the boxed i7-7800X includes no fan or heatsink. With a 140W TDP and an LGA 2066 socket, a dual tower such as the Peerless Assassin 120 or a 240mm to 360mm AIO that lists LGA 2066 is the sensible starting point for most builds.
Which of the best CPU coolers for i7 7800X suits overclocking?
The ARCTIC Liquid Freezer II 280 A-RGB and the be quiet! Pure Loop 2 FX 360 offer the most radiator area here, and both list LGA 2066. On air, the Peerless Assassin 120 is the strongest verified option. Results depend on your chip, voltage and case airflow.
Will an LGA 2011-3 cooler fit LGA 2066?
Often, because both sockets use a square ILM design, and many coolers list them together. Still, confirm LGA 2066 is named on the maker page or listing. Every pick here names LGA 2066 directly or, in the case of the NH-D15S, supports it with Noctua’s separate NM-i20xx kit.
Conclusion
Buy the Thermalright Peerless Assassin 120 for an i7-7800X. Its maker page lists LGA 2066, its dual tower and two fans handle a 140W six-core with room to spare, and it costs about $36. Choose the Liquid Freezer II 280 A-RGB if you plan to overclock and have a 280mm mount, and the SI-100 for low cases.
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