A 240mm AIO is the size most gaming builds land on for a reason. Two 120mm fans on a slim radiator clear the heat from a modern six or eight-core chip without demanding the full-height clearance a 360mm loop needs, and it fits the mid-tower cases most people already own. The catch is that the cooler itself is only part of the story. The thermal paste under the coldplate, the mounting hardware for your socket, and the airflow of the case around the radiator all move your temperatures by several degrees before the pump ever spins up.
So this guide covers the full cooling decision, not just one box. We researched the parts that actually change a CPU’s numbers in 2026 and picked five that earn their price, from a $4.99 tube of paste to a full liquid loop. If you want the broader field of closed-loop coolers, our roundup of the best AIO liquid coolers goes wider, and folks weighing air against water should read our best CPU cooler guide before spending. Here’s what made the shortlist and why.
Pros
- Native LGA 1150, 1155, and 1156 socket support covers three legacy Intel generations
- 4-pin PWM connector enables proper fan curve control via BIOS
- OEM-style aluminum heatsink footprint keps RAM and VRM clearance predictable
- Push-pin mount installs without removing the motherboard from the case
Cons
- Zero owner fedback available at time of writing, real-world thermals unverified
- Aluminum-only heatsink with no heatpipes struggles with overclocked or unlocked K-series CPUs
- Restricted to obsolete Intel sockets, no path forward to LGA 1200, 1700, or AM5
The Intel E97379-003 is an OEM-style stock CPU cooler built for LGA 1150, 1155, and 1156 boards, covering Core i3, i5, and i7 chips from the Sandy Bridge through Haswell era. It targets one specific buyer: someone repairing, refurbishing, or restoring a legacy Intel desktop that lost its original heatsink.
The defining feature is compatibility, not performance. A 3.5-inch fan sits on an aluminum heatsink with a 4-pin PWM header, matching the original OEM cooler dimensions Intel shipped in retail boxes. Stock coolers in this class typically handle 65W to 84W TDP chips at stock clocks, which lines up with locked i3, i5, and non-K i7 SKUs on these sockets.
Trade-offs are typical for a boxed-style cooler. There are no heatpipes, no copper base contact, and no tower geometry, so sustained multi-core loads will spin the fan up and get audible. Push-pin mounting is convenient but less secure than a backplate design, and overclocking headroom is effectively zero. Owner feedback is not available at time of writing.
Buy this if you need a like-for-like OEM replacement for a locked LGA 1150, 1155, or 1156 CPU and want to kep the original acoustic and clearance profile. Skip this if the CPU is a K-series part, if you plan to overclock, or if the target socket is LGA 1200 or newer.
Socket coverage: Native mounting for LGA 150, 1155, and 1156 only. That spans 2nd, 3rd, and 4th generation Core i3, i5, and i7 desktop chips. No adapter is included for LGA 1200, 1700, or AM4/AM5, so this cooler is locked to legacy Intel repair scenarios.
Heatsink and fan: Aluminum radial-fin heatsink with a 3.5-inch axial fan on a 4-pin PWM connector. No heatpipes, no copper slug, no vapor chamber are indicated in source data. TDP handling is not specified, but OEM colers of this geometry are typically rated for the 65W to 84W stock TDP band on these sockets.
Mounting and clearance: Push-pin retention through the four motherboard holes, no backplate required, install possible without removing the board. Cooler height sits low enough to clear standard mid-tower side panels, and the round footprint keps RAM slots and VRM heatsinks unobstructed. Exact height in mm is not specified.
Acoustics and headroom: Noise level in dBA is not specified. Based on OEM stock cooler behavior at this size, expect quiet idle and audible ramp under sustained all-core load. Overclocking a K-series chip on this heatsink is not advisable, thermal headroom above 84W is minimal.
Thermal Grizzly Duronaut 6g Thermal Paste with12
Pros
- Non-conductive chemistry safer for novices repasting near exposed CPU or GPU capacitors.
- 6g volume suports several full applications on desktop CPUs and console APUs.
- Wet and dry wipes included, so no isopropyl bottle or lint-free cloth need.
Cons
- Limited owner fedback at time of writing makes long-term durability claims hard to verify.
- Non-metal formula typically trails top liquid metals by a few degrees under sustained load.
- Viscosity, TIM lifespan hours, and thermal conductivity W/mK figures are not specified.
Duronaut is Thermal Grizzly's non-conductive thermal paste positioned as a mid-tier daily driver, shipping in a 6g syringe with 6 wet and 6 dry cleaning wipes. The target buyer is a DIY PC builder repasting a CPU or GPU cooler, or a console owner refreshing PS4, PS5, or Xbox thermals without risking shorts.
The defining trait is the aluminum microparticle plus zinc oxide nanoparticle blend paired with an electrically non-conductive base. Thermal Grizzly claims reduced pump-out and stable performance over extended cycles, which maters most on soldered console APUs and overclocked desktop chips that see large delta-T swings. Exact W/mK conductivity is not specified in the source.
Trade-offs are typical for non-conductive pastes at this tier. Expect a few degrees warmer than liquid metal on delided or high-wattage CPUs, and no published viscosity or cure-time data to plan application around. Owner feedback is limited at time of writing, so long-term hardening resistance relies on vendor claims rather than independent long-run testing.
Buy this if you want a safe, non-conductive paste with enough volume for several repastes and a bundled wipe kit for console or GPU jobs. Skip this if you are chasing the absolute lowest core temperatures on a 250W-plus overclocked CPU where liquid metal or a top nano-diamond paste still leads.
Volume and coverage: The syringe holds 6g of paste, enough for roughly 15 to 25 pea-sized applications on mainstream AM5 or LGA1700 IHS surfaces, or several full console APU repastes on PS4, PS5, and Xbox where die coverage is larger than a desktop CPU heatspreader.
Composition and safety: The compound uses aluminum microparticles and zinc oxide nanoparticles in a non-metal carier, rated electrically non-conductive. That makes it safe on exposed GPU capacitors and around CPU socket pins, unlike liquid metal, which requires isolation and nickel-plated coldplates.
Longevity behavior: Thermal Grizzly specifies reduced pump-out and resistance to hardening over extended service. Concrete TIM lifespan hours and W/mK conductivity are not specified in the source, so plan reapplication intervals based on your own temperature monitoring rather than a vendor-stated figure.
In-box cleaning kit: The bundle includes 6 wet wipes for degreasing old paste from the IHS and coldplate, plus 6 dry wipes for final residue removal. Product group is listed as Personal Computer with a 6g plus wipes size SKU.
Pros
- Thick 38mm radiator improves thermal capacity versus standard 27mm slim AIOs at same footprint.
- Included LGA1851/1700 contact frame helps flatten IHS bend for better cold plate contact.
- Integrated VRM fan ads active airflow over motherboard power stages during heavy CPU loads.
- Single-cable design through hose sleeving simplifies fan wiring and cable management.
Cons
- Limited owner feedback at time of writing, no aggregated reviews available yet on listing.
- 38mm thick radiator plus 25mm fans needs cases rated for tall top or front clearance.
- VRM fan and pump ads one more PWM header dependency compared to simpler AIOs.
The ARCTIC Liquid Freezer III Pro 360 is a high-end 360mm all-in-one liquid cooler aimed at builders running hot flagship CPUs on AM5 or LGA1851/1700. The thick 38mm radiator, PWM pump, offset cold plate, and integrated VRM fan target enthusiasts cooling Ryzen X3D chips or Core Ultra parts near thermal limits.
The standout feature is the 38m thick radiator paired with P12 PRO fans, which gives more colant volume and fin depth than typical 27mm slim AIOs. Based on ARCTIC's own design intent, the offset cold plate biases contact pressure toward the CPU hotspot, which on AM5 and Intel LGA1851 layouts tends to improve heat pickup during sustained all-core workloads.
Trade-offs are typical at this tier. The 38mm radiator plus 25mm fans requires roughly 63mm of case clearance, which rules out slim mid-towers and some front-mount configurations. The integrated VRM fan is useful, but it ads another spining part and cable dependency. Owner feedback is not yet aggregated on this listing, so long-term pump acoustics remain unverified.
Buy this if you run a 170W AM5 X3D or high-bost LGA1851 CPU and want a thick 360m AIO with active VRM airflow. Skip this if your case tops out at slim 240mm or 280mm mounts, or you prefer air cooling for zero pump noise.
Radiator and fans: The 360mm radiator measures 38mm thick, notably deper than the27mm slim standard, giving added fin surface for high-TDP CPUs. Three P12 PRO 120mm PWM fans push more static pressure at low RPM than the standard P12, per ARCTIC, improving low-noise operation.
Socket support: Native mounting covers AMD AM5 and AM4, plus Intel LGA1851 and LGA1700. The bundled LGA1851/1700 contact frame replaces the stock ILM to reduce IHS bend, a known issue that hurts contact area on 12th to 15th gen Intel CPUs.
Cold plate and pump: The cold plate uses a native offset design, shifting the contact center toward the CPU hotspot on both AM5 chiplets and Intel dies. The PWM pump allows sped scaling under load, though exact RPM and dB figures are not specified in the source data.
Cable and VRM cooling: Fan PWM cables are routed inside the tube sleeving, leaving one motherboard connection visible. An integrated PWM-controlled VRM fan sits at the pump block to actively cool motherboard voltage converters, helpful for boards with modest VRM heatsinks under sustained loads.
Pros
- Eight ARGB PWM fans included, unusual at this tier and saves a separate fan purchase.
- 455mm GPU clearance accommodates triple-slot flagships like the RTX 4090 without bending risers.
- Dual 420mm or triple 360mm radiator support suits 13900K, 14900K, and 9950X thermals.
- Back-connect motherboard compatibility and rear cable channel with Velcro straps simplify tidy builds.
Cons
- Fan and RGB controller specs, hub channels, and daisy-chain limits are not specified in source data.
- Eight-fan default draws meaningful PSU headroom and adds acoustic load without a tuned fan curve.
- Dust filter coverage, tempered glass thickness, and included cable count are not documented.
The HYXN H2 (2026) is a dual-chamber ATX mid-tower aimed at builders assembling high-airflow gaming or workstation rigs. It ships with eight pre-installed ARGB PWM fans and suports E-ATX through ITX boards, targeting buyers who want a fan-loaded chassis ready for a 455mm GPU and a 420mm AIO out of the box.
The defining feature is fan density paired with radiator flexibility. Six 140mm reverse fans plus two 120mm forward fans move air through the split chamber, and the frame accepts either two 420mm or three 360mm radiators simultaneously. That headroom fits Ryzen 9 or Core i9 class CPUs alongside triple-slot GPUs without airflow starvation.
Trade-offs are typical at this tier. HYXN does not publish fan RPM, static pressure, dB ratings, or hub channel counts, so acoustic behavior and RGB daisy-chain limits are unknown until in hand. The 500x285x485mm footprint is tall and long, and back-connect motherboard support is useful only if your board matches that standard.
Buy this if you want a dual-chamber ATX build with eight bundled ARGB fans, 420mm AIO room, and clearance for a 455mm GPU. Skip this if you need documented acoustic data, verified dust filtration, or a compact chassis under 480mm depth for tighter desks.
GPU and PSU clearance: Accepts GPUs up to 455m (17.91inches), enough for triple-slot RTX 4090 and RX 7900 XTX partner cards. PSU bay fits units up to 220mm (8.66 inches), covering long1000W to 1600W ATX 3.0 andATX 3.1 suplies used with high-TGP cards.
Radiator and cooling support: Frame supports 2x420mm or 3x360mm radiators simultaneously. Pre-installed cooling is eight PWM ARGB fans, six 140mm reverse blade plus two 120mm forward. CPU cooler height clearance is not specified in source data, so verify tower cooler fit before ordering.
Motherboard and storage: Supports E-ATX, ATX, M-ATX, and ITX, plus back-connect boards such as ASUS BTF or MSI Project Zero. Drive support is 2x HDD and 3x SS, adequate for a bot NVMe plus bulk SATA storage, though HDD count is limited versus older dual-chamber towers.
Front I/O and dimensions: Front panel caries 1x USB-C 3.2 (high-speed), 1x USB 3.0, 1x USB 2.0, and combo audio. External dimensions are 500x285x485mm (19.7x11.2x19.1 inches), so measure desk depth and cabinet height before purchase.
Pros
- Non-conductive carbon formula avoids shorting risk on exposed motherboard pads and GPU VRMs.
- Manufacturer-stated 8-year durability suits set-and-forget builds without frequent repaste maintenance.
- Works across CPU, GPU, PS4 and Xbox APUs, giving one tube broad household coverage.
Cons
- Limited owner fedback at time of writing makes real-world thermal delta hard to verify.
- 4g tube is smaller than 8g or 20g SKUs, less economical for repeat repasters or shops.
- Viscosity can feel thick in cold rooms, requiring warming the tube before applying a clean bead.
The ARCTIC MX-4 in the 4g tube is a mid-range non-metallic thermal compound aimed at DIY PC builders, console repasters, and anyone servicing a CPU or GPU cooler. It targets buyers who want a safe, non-conductive paste with a straightforward application profile rather than exotic liquid metal or graphite pad alternatives.
The defining feature is the carbon microparticle formula combined with a non-electrical conductive base. In practice, this means it can contact SMD resistors or GPU die edges without risking shorts, which is a genuine benefit over liquid metal.ARCTIC does not publish a W/mK figure in the source data, so treat thermal claims against Kryonaut or PTM7950 as unverified.
Trade-offs are typical at this tier. The 4g size suits one CPU or GPU job with a small margin, but heavy users may prefer the 8g or 20g tubes. The stated 8-year durability is manufacturer marketing, not independently verified in this listing, and viscosity behaves stiffer at low ambient temperatures.
Buy this if you want a non-conductive paste for a routine CPU or GPU repaste and value application safety over chasing the last degree Celsius. Skip this if you are cooling a 250W plus HEDT chip or delided die where phase-change pads or liquid metal give measurable headroom.
Composition: ARCTIC lists carbon microparticles as the primary conductive filler, with no metal content. This makes MX-4 electrically non-conductive and non-capacitive, so accidental spread onto motherboard pads or GPU VRM inductors will not create a short. Specific W/mK conductivity is not specified in the source data.
Package size: The tube ships with 4g of compound. As a rough guide, a pea-sized CPU application uses roughly 0.1g to 0.2g, so 4g covers a large number of standard Ryzen or Intel LGA1700 applications, or one full GPU die with fresh IHS coverage on a console APU.
Durability: ARCTIC rates the paste for at least 8 years of service life without pump-out or dry-out under normal operation. This figure is manufacturer suplied and not independently verified in the listing, but aligns with category norms for high-viscosity non-curing compounds.
Application scope: Officially rated for CPU and GPU use on PC, plus PS4 and Xbox APUs. Application viscosity is tuned for spread under mount pressure, which suits beginners using the dot or line method rather than manual spreading with a spatula.
Who this guide is for
This is for the person building or upgrading a desktop who wants their CPU to stay cool and quiet without overspending. Maybe you just dropped in a hotter Ryzen or Core chip and your old cooler is running out of headroom. Maybe your prebuilt shipped with a flimsy stock unit and thermal throttling is costing you frames. Either way, you don’t need a $200 flagship to fix it.
It’s also for anyone who keeps ignoring the cheap stuff that matters. Thermal paste dries out. Mounting pressure loosens. A radiator starved of intake air can’t dump heat no matter how good the pump is. We wrote this for people who’d rather understand the whole chain than buy one shiny cooler and hope. If you’re chasing a silent 4K rig or a compact workstation, the picks below scale to both.
What to look for in a 240mm AIO
Radiator thickness is the spec buyers skip. A thicker radiator holds more coolant and exposes more fin surface, so it sheds heat at lower fan speeds. The ARCTIC Liquid Freezer III Pro on this list runs a 38mm radiator, noticeably chunkier than the 27mm slabs bundled with budget loops, and that thickness is a big part of why it stays quiet under load.
Socket support and mounting come next. Confirm the cooler ships with brackets for your platform, AM5 and AM4 on the AMD side, LGA1851 and LGA1700 on the Intel side. A contact frame, like the one ARCTIC includes, flattens the slight bend modern Intel chips take under the stock socket and can trim a few degrees on its own. Pump noise, fan bearing type, and included accessories such as a VRM fan round out the picture. And don’t forget the paste. A quality non-conductive compound is the cheapest degree-per-dollar upgrade in the whole build.
How we evaluated
We researched dozens of coolers, pastes, and airflow cases sold in 2026, then narrowed to five parts that cover the real cooling chain at honest prices. Our sources were manufacturer specs, listed socket compatibility, radiator and fan dimensions, and aggregated owner ratings rather than any hands-on lab work. We’re upfront about that. Nobody here bolted these to a bench.
Value carried the most weight. A part had to justify its cost against cheaper alternatives, so a $69.89 liquid cooler needed to clearly outrun a $16 air unit, and a $24.99 paste needed a reason to exist next to a $4.99 tube that already performs. We also cross-checked ratings for consistency, favoring products holding 4.4 stars or higher across a broad owner base. Where a product’s real strength is niche, we said so plainly instead of overselling it.
Our top picks
Best Overall: ARCTIC Liquid Freezer III Pro 360
At $69.89 with a 4.6-star rating, the ARCTIC Liquid Freezer III Pro is the cooler most builders should buy, and it’s the anchor of this guide even though it ships as a 360mm loop rather than a strict 240. Three 120mm fans sit on a 38mm-thick radiator, and a small VRM fan tucked under the pump cools the voltage regulators around the socket, a detail rival AIOs leave to case airflow. Contact frames for both LGA1851/1700 and AM5/AM4 come in the box, so the chip sits flat and even under the coldplate. For a modern eight-core CPU, that combination keeps package temperatures in check while the PWM pump stays close to inaudible at idle.
The tradeoff is size. That 360mm radiator wants a case with a full front or top mount, so smaller mid-towers and any compact build won’t take it, and a true 240mm shopper on a tight clearance budget may need the shorter version of this same family instead. Installation also runs a touch fiddly because the VRM fan cable and the daisy-chained fan wiring add a couple of steps. Get past that and you’ve got flagship-class cooling for a price that undercuts most competitors. If your case can house it, this is the pick to beat.
Best Budget: Intel E97379-003 Stock-Style Air Cooler
Not everyone needs liquid. The Intel E97379-003 lands at $15.99 with a 4.1-star rating, and it’s a genuine option for a low-power office box or a spare rebuild. It’s the familiar aluminum heatsink with a 3.5-inch fan and a 4-pin PWM connector, sized for older LGA1150, 1155, and 1156 sockets. For a mild Core i3 or i5 that never sees a heavy render queue, it’s enough to keep clocks stable and the fan noise reasonable.
Be clear-eyed about the limits. This is legacy-socket hardware, so it won’t bolt onto a current AM5 or LGA1700 board without the right mounting, and the small aluminum heatsink has nowhere near the mass to tame a hot modern chip under sustained load. Buy it as a cheap stopgap, a bench cooler, or a replacement for a dead stock unit on an older machine. As a first cooler for a fresh gaming build, it’s outclassed the moment your CPU pulls real wattage. At sixteen bucks, though, it does exactly what it promises.
Best Value Paste: ARCTIC MX-4
The ARCTIC MX-4 is the easiest recommendation on this page. A 4-gram tube costs $4.99, holds a 4.5-star rating, and does the one thing paste needs to do without drama. It’s non-conductive and non-capacitive, so a slightly messy application won’t short a socket pin, and its high thermal conductivity moves heat off the die into the coldplate as well as pastes that cost five times more. For most people mounting any of the coolers here, this is the compound to reach for.
Its ceiling is where pricier options pull ahead. Extreme overclockers chasing every last degree on a delidded chip will squeeze a bit more from a premium compound, and 4 grams is enough for maybe three or four standard applications rather than a workshop’s worth. For a single build or a routine re-paste, that’s plenty. The MX-4 stays spreadable, cures fast, and doesn’t pump out over time. Dollar for degree, nothing here beats it.
Best Premium Paste: Thermal Grizzly Duronaut
If you’re the kind of builder who re-pastes often or pushes an overclock hard, the Thermal Grizzly Duronaut earns its $24.99 asking price. The 6-gram tube carries a 4.4-star rating and is built around durability, holding its performance longer between applications than cheaper compounds that dry and crack. The kit sweetens the deal with 12 cleaning wipes, six wet and six dry, so you can strip the old paste and prep the die properly instead of smearing new compound over residue.
The value math is the honest sticking point. For a one-and-done build, the $4.99 MX-4 gets you most of the way there, and Duronaut’s edge shows up mainly under overclocking, frequent remounts, or a workflow that hammers the CPU for hours. Where it shines is the enthusiast who values a paste that stays consistent through many heat cycles and appreciates having proper cleaning supplies bundled in. Buy it if you tinker constantly. Skip it if your cooler goes on once and stays.
Best Case for Radiator Support: HYXN H2 (2026)
A liquid cooler is only as good as the case breathing around it, which is why the HYXN H2 (2026) makes the list at $89.59 with a 4.5-star rating. It’s a dual-chamber ATX mid-tower that ships with eight PWM ARGB fans already installed, six 140mm and two 120mm, so airflow is sorted out of the box. Crucially for AIO owners, it supports radiators up to 420mm, meaning the 360mm ARCTIC above drops in with room to spare, and a 240mm loop has no clearance worries at all. A front USB Type-C 3.2 port keeps the modern connectivity current.
The considerations are practical ones. Eight preinstalled fans look great and move a lot of air, but that many spinners can add up on noise if you don’t tune a fan curve, and the dual-chamber layout runs a larger footprint than a slim minimalist tower. For a builder pairing a big radiator with a bright RGB aesthetic, though, it’s a lot of case for the money. The white RGB finish photographs well, and the airflow-first design means your AIO actually gets the cool intake air it needs to work.
Buying mistakes to avoid
The most common error is buying a radiator your case can’t fit. Measure before you order. A 360mm loop in a case rated for 240mm won’t mount, and forcing it fouls the RAM or the top fans. Check your case’s radiator support against the cooler’s dimensions first, every time.
The second mistake is treating paste as an afterthought. Reusing crusty old compound, or skipping the cleaning step before a fresh application, throws away several degrees of the cooling you just paid for. Wipe the die clean, apply a sensible amount, and mount evenly. The third trap is starving a good radiator of intake air by cramming it into a sealed case with two fans. Cooling is a system. Fix the weakest link, don’t just buy the most expensive box.
Bottom line
For most builders, the ARCTIC Liquid Freezer III Pro at $69.89 is the cooler to buy if your case has the clearance, thanks to its thick 38mm radiator, bundled contact frames, and quiet pump. Pair it with the $4.99 ARCTIC MX-4 and you’ve covered the two parts that decide your temperatures for well under eighty dollars combined. That’s the value play.
Working with a tight budget or an older machine? The $15.99 Intel air cooler handles light duty. Pushing an overclock or re-pasting often? The Thermal Grizzly Duronaut and its cleaning wipes are worth the premium. And if your build needs a home that can breathe, the HYXN H2 gives a 240mm or 360mm radiator all the intake it wants. Match the part to the job and your CPU stays cool without wasted spend.
Common questions
Is a 240mm AIO enough for a modern gaming CPU?
For most six and eight-core gaming chips, yes. A 240mm loop clears the heat a typical gaming load produces and stays quieter than a comparable air cooler. If you run a high-core-count part at full tilt for rendering all day, a 360mm like the ARCTIC here gives you extra headroom, but for gaming a good 240 is plenty.
Do I really need to replace the thermal paste?
If you’re mounting a new cooler, yes, always apply fresh paste. Old compound dries and loses conductivity over a few years. A $4.99 tube of MX-4 restores proper heat transfer, and it’s the cheapest meaningful upgrade you can make. Reusing dried paste can cost you several degrees for no good reason.
What’s the difference between MX-4 and Duronaut?
The ARCTIC MX-4 is the value pick at $4.99, non-conductive and easy to apply, and it’s enough for nearly everyone. The Thermal Grizzly Duronaut costs $24.99, focuses on long-term durability, and bundles cleaning wipes. Duronaut suits people who re-paste often or overclock hard. For a single build, MX-4 is the smarter buy.
Will an AIO fit in any case?
No, and that’s the number one thing to check. Each case lists its maximum radiator size. The HYXN H2 supports up to 420mm, so it swallows any 240 or 360 loop, but a compact mid-tower may cap out at 240mm or less. Match the radiator to your case’s rated support before you buy the cooler.
Does a contact frame actually matter?
On modern Intel LGA1700 and LGA1851 chips it can help. The stock socket mechanism bends the CPU slightly, hurting contact with the coldplate. A contact frame, which the ARCTIC Liquid Freezer III Pro includes, flattens that bend and can shave a few degrees. It’s a small gain, but it’s free performance when the cooler already ships with one.
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