Best PC Cooling Upgrades: CPU Cooler, Case Fans and Thermal Pads

The best first PC cooling upgrade for most gaming and work desktops is a good dual-fan air cooler such as the Thermalright Peerless Assassin 120 SE, because it replaces the weakest part of a stock setup, the small CPU heatsink, at a modest cost. If your processor already has a decent cooler and the case still runs hot, upgrade the case fans next: the ARCTIC P12 Slim PWM PST suits tight spaces and the Noctua NF-P12 redux-1700 PWM is a quiet general-purpose fan. Thermal pads and a dust blower are small add-ons that can help in specific situations, and the picks below explain when.

This guide is research-based. We did not personally use these products; every spec below comes from the listing title and the maker’s published information, and anything we could not confirm is marked “not listed”. It focuses on upgrades that fit a PC you already own: a CPU cooler, case fans and thermal pads, plus a way to keep dust out of all three.

LHKLUK 4 Pack Thermal Pad, 100x100mm 1mm x2 & 1.5mm x2 CPU Thermal Pad & Thermal Pads GPU & SSD, Stackable to 2.0mm, High Efficiency 6.0 W/mK Heat Resistant Silicone Pads for Laptop Heatsink

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WFPOWER Wireless IR Remote Control 24 keys PS4 Cooling Fan RGB USB LED Cooler Thermal Fan Pad Stand for PC Case CPU Cooler Computer Gaming PS4 Playstation 4 Consoles Laptop Notebook XBOX One Radiators

Included for 'Best PC Cooling Upgrades: CPU Cooler, Case Fans and Thermal Pads' because the listing adds cooling or gel-infused layers, which is the attribute this article compares.

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WOWLED Cooling Fan Mini 3 Keys Control Gaming USB RGB LED Cooler Thermal Fan Pad for PS4 PlayStation 4 Xbox One X Consoles Laptop Notebook PC CPU Coolers Computer Cooling Strip Light Case Fan

Included for 'Best PC Cooling Upgrades: CPU Cooler, Case Fans and Thermal Pads' because the listing adds cooling or gel-infused layers, which is the attribute this article compares.

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TAODAN 4pcs 120mm Black Antivibration Rubber Fan Gasket Shock Absorption Pad for Computer PC Case, Black

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Top Picks at a Glance

• Best Value CPU Cooler: Thermalright Peerless Assassin 120 SE, for twin towers and dual 120mm fans at a budget cost.
• Best Quiet Mid-Range Cooler: be quiet! Pure Rock Pro 3, for a compact double-tower with RAM and VRM clearance in mind.
• Best Premium Air Cooler: Noctua NH-D15 chromax.Black, for a large dual-tower with dual 140mm fans.
• Best General Case Fan: Noctua NF-P12 redux-1700 PWM, for a quiet 120mm fan with a thicker frame.
• Best Slim Fan: ARCTIC P12 Slim PWM PST, for tight spaces and pressure-focused cooling.
• Best Thermal Pad: ARCTIC TP-3 100 x 100 x 1.5 mm, for M.2 heatsinks, VRMs and memory.
• Best Maintenance Tool: IT Dusters AirTec Ultra Electric Air Duster, for clearing dust without disposable cans.

Quick Comparison Table

Which Upgrade Should Come First?

Cooling is a chain: heat leaves the chip through the cooler, then leaves the case through airflow. The weakest link limits the whole system, so start with a quick diagnosis instead of buying parts at random.

1. Thermalright Peerless Assassin 120 SE: Best Value CPU Cooler

• Six heat pipes with AGHP technology
• Dual 120mm PWM fans at up to 1550RPM
• Supports AMD AM4 and AM5
• Supports Intel LGA 1700, 1150, 1151, 1200 and 1851
• Twin-tower radiator layout

Best for: Mainstream CPUs in a mid-tower case where you want a large step up from a stock cooler without a premium price. Skip if: you have a small case or very tall RAM; check the clearance first.

This cooler exists because buyers wanted flagship-style cooling at a sensible price. Two towers share the load from six heat pipes, and the dual fans push air through them in a push-pull layout. The socket list is broad: AM4 and AM5 on the AMD side and several Intel generations including the newer LGA 1851.

What matters in daily use is noise and temperatures under sustained load. A larger radiator lets the fans spin slower for the same heat, which keeps the PC quieter. The 1550RPM maximum is moderate, so at idle the fans can be near-silent with a sensible fan curve.

Before buying, measure the space. Dual-tower coolers are tall and wide, and some cases limit cooler height to about 155mm to 160mm. Tall memory modules can also collide with the front fan. The maker lists the dimensions; compare them with your case’s maximum CPU cooler height.

Pros: strong cooling for the cost; dual fans; wide socket support; easy to add a second fan. Cons: large; may clash with tall RAM; basic mounting instructions.

2. be quiet! Pure Rock Pro 3: Best Quiet Mid-Range Cooler

• 250W TDP rating
• Double-tower compact design
• Two silent 120mm PWM fans
• Six 6mm high-performance heat pipes
• Designed for high RAM and VRM compatibility

Best for: Builders who want a quieter system and need extra clearance around memory and the motherboard’s power section. Skip if: your CPU is a flagship that runs hot under all-core loads; consider a larger cooler or an AIO.

be quiet! builds its name on low noise, and this model follows that approach. The “compact” double-tower layout aims to leave space for tall memory and the heatsinks around the CPU socket. The 250W TDP rating is the maker’s cooling capacity figure, and it is a guide rather than a guarantee, since real results depend on case airflow.

The black finish suits dark builds without RGB. It is a sensible choice for a home-office or living room PC where noise matters more than a record-low temperature.

Pros: quiet focus; RAM and VRM clearance; clean look; 250W TDP rating. Cons: costs more than similar twin-tower budget coolers; not the highest performer.

3. Noctua NH-D15 chromax.Black: Best Premium Air Cooler

• 168mm height
• Six heat pipes
• Dual 140mm fans
• Intel and AMD compatibility
• Rich accessory kit

Best for: High-end CPUs where you want near-AIO cooling with air-cooled reliability and low noise. Skip if: your case is narrow or you plan to install tall RAM; at 168mm, many compact cases will not close.

The NH-D15 has been a reference air cooler for years, and this chromax.Black version swaps the brown fans and tower for black. The dual 140mm fans move more air at lower speeds, which means lower noise, and the accessory kit includes the tools needed for mounting.

The real constraint is size. At 168mm tall and wide enough to overhang the memory slots on many boards, this cooler demands a roomy case. Measure first. If the case fits and the CPU is a high-power chip, few air coolers keep it as quiet. For a deeper comparison with a liquid option, see our existing air versus AIO guide on this site.

Pros: premium cooling; very quiet; dual 140mm fans; all-black finish; complete mounting kit. Cons: large and heavy; premium cost; case and RAM clearance issues.

4. Noctua NF-P12 redux-1700 PWM: Best General Case Fan

• 120mm size
• 25mm thick frame
• 1700rpm maximum speed
• 4-pin PWM control
• High airflow with low noise per the listing

Best for: Front intake, rear exhaust and radiator use, where a dependable, quiet fan is more valuable than lighting. Skip if: you want RGB.

The redux line trims cost by using simpler packaging and a plain finish while keeping the core fan design. The 4-pin PWM connection lets the motherboard adjust the speed smoothly, and the 25mm frame is the standard thickness for most case fan mounts.

A good rule is to pair two intake fans at the front with one exhaust at the rear, then adjust speeds so the case has slightly positive pressure. That setup pushes air through dust filters and reduces dust buildup.

Pros: quiet; PWM control; affordable for the brand; long service life. Cons: no lighting; plain colours; sold singly.

5. ARCTIC P12 Slim PWM PST: Best Slim Fan

• 120mm size
• Pressure-optimised design
• PWM control with PST daisy-chain
• Slim frame (thickness not listed in the title)

Best for: Small-form-factor cases, thin radiators and spots where a standard 25mm fan will not fit. Skip if: you need maximum airflow in open space; thicker fans move more air.

Pressure-optimised fans are built to push air through restrictions such as dust filters, radiators and heatsinks. In a tight case that matters more than raw airflow. The PST feature lets several fans connect to a single header and follow the same speed signal, reducing cable clutter.

Because the listing is brief, confirm the exact thickness on ARCTIC’s page before buying. Slim fans are a niche solution, and their value shows in cases that otherwise cannot accept a 120mm fan at all.

Pros: fits tight spaces; pressure focus; PWM; low cost. Cons: less airflow than thicker fans; details thin in the listing.

ARCTIC P12 Slim PWM PST - PC Fan, 120 mm Fan, Pressure-optimised

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6. ARCTIC TP-3 Thermal Pad (100 x 100 x 1.5 mm): Best Thermal Pad

• 100 x 100 mm sheet
• 1.5 mm thickness
• For memory, VRMs and M.2 cooling
• Thermal conductivity not listed in the title

Best for: Replacing a worn pad on an M.2 heatsink or sealing a gap between a chip and a heatsink. Skip if: you are trying to cool a CPU; use thermal paste there, not a pad.

Thermal pads fill gaps. Where paste is for thin gaps between flat metal surfaces, pads are for uneven or larger gaps, such as between a graphics card’s memory chips and its backplate. Choosing the correct thickness is the key step: too thin and there is no contact, too thick and the pad stops the heatsink from seating.

Measure the old pad with a caliper, then buy the same thickness. If you do not know the thickness, a sheet of 1.5 mm is a common starting point for M.2 and VRM jobs, but it is not universal. Always cut the pad cleanly to size, keep it free of fingerprints and avoid layering pads.

Pros: large sheet for several jobs; non-conductive pad design (confirm on the maker’s page); low cost. Cons: thickness must match; conductivity not listed; easy to misuse.

ARCTIC TP-3: Premium Performance Thermal Pad, 100 x 100 x 1.5 mm

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7. IT Dusters AirTec Ultra Electric Air Duster: Best Maintenance Tool

• Electric blower rather than a spray can
• For PCs, laptops, consoles and electronics
• Marketed as an environmental alternative to spray dusters
• Listed as Type 3

Best for: Regular dust removal from filters, fans and heatsinks, especially if you clean several devices. Skip if: you rarely clean your PC; a soft brush may be enough.

Dust is the silent cause of many cooling problems. A clogged filter or heatsink reduces airflow more than most people expect, and cleaning can restore temperatures without buying any part. An electric blower removes the cost of disposable cans and the cold propellant that can condense on components.

Always clean with the PC off and unplugged, hold fans still so they do not overspin, and blow in short bursts. Do not use a vacuum on a PC, because it can build static charge.

Pros: reusable; no cans; multi-device; powerful air. Cons: noise when running; power spec not listed; can overspin fans if used carelessly.

IT Dusters AirTec Ultra Electric Air Duster Blower for PC, Laptop, Console, Electronics and Home Cleaning, Environmental Alternative to Spray air can Duster Keyboard Cleaner (Type 3)

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Also Consider

Thermalright Assassin X120 Refined SE

A low-cost single-tower cooler with four heat pipes, a TL-C12C PWM fan and an aluminium cover. A tighter-budget option for smaller cases.

be quiet! Pure Wings 3 120mm PWM

A silent 120mm PWM case fan with a rifle bearing. Choose it for quiet builds on a budget.

CORSAIR RS120 PWM

A 120mm PWM fan with daisy-chain connection and a magnetic dome bearing. Convenient for cable management.

ARCTIC TP-4 Thermal Pad (100 x 100 x 1.5 mm)

The newer ARCTIC pad series in the same size as the TP-3. Check the maker’s page for conductivity details.

How We Chose

This guide is research-based. We compared the manufacturers’ published specs and each product’s listing details, and we used general cooling guidance from Noctua, ARCTIC and be quiet! knowledge-base pages for context. We did not personally use these parts. We kept to products currently sold, limited each brand to two entries and covered each part of the cooling chain: CPU, case, memory or storage pads and maintenance. When a spec was not in the listing, we wrote “not listed” instead of guessing.

Buying Guide

1. Check clearance before cooling performance

A cooler that does not fit is the most common reason for returns. Measure the maximum CPU cooler height in your case manual, usually 155mm to 185mm, and compare with the cooler’s height. Check the distance from the CPU socket to the top memory slot and to the top of the motherboard’s heatsinks. A dual-tower cooler may need memory under about 40mm tall.

2. Pick fans by size, thickness and control

Most cases use 120mm or 140mm fans. 25mm thickness is standard; slim fans are 15mm. 4-pin PWM lets the motherboard control speed smoothly, while 3-pin DC fans are limited to voltage control. Pressure-optimised fans work better behind dust filters and radiators; airflow-optimised fans work better with open grills.

3. Plan airflow before adding fans

A basic layout is two or three intake fans at the front and one exhaust at the rear and top. Keep slightly more intake than exhaust to maintain positive pressure, which reduces dust entering through gaps. Adding more fans to a poorly arranged case rarely helps as much as moving them.

4. Use pads and paste for what they do

Thermal paste goes between a CPU or GPU die and its cooler. Thermal pads fill larger gaps on memory chips, VRMs and M.2 drives. Never use conductive material on exposed contacts, and replace pads when you remove a heatsink, since old pads tear and lose contact.

5. Treat dust as a part of cooling

Clean filters every one to three months depending on your home. Dust on a heatsink acts like a blanket. A routine cleaning with a blower or soft brush can drop temperatures without cost.

Common Mistakes to Avoid

• Installing a tall cooler without checking case width and memory clearance.
• Choosing a thermal pad of the wrong thickness.
• Connecting several fans directly to one header without checking its current limit; use a splitter or PST chain correctly.
• Blowing dust at spinning fans without holding them still.
• Changing fans before checking the BIOS fan curve.

A Worked Airflow Plan for a Typical Mid-Tower

Numbers help turn advice into a plan. Imagine a mid-tower with a mesh front panel, a rear 120mm exhaust position and a top panel that can hold two 120mm fans. A balanced layout for this case looks like the table below. It is a starting point, and the best settings come from watching your own temperatures in monitoring software.

Three intake-side fans and two exhaust-side fans keep the case slightly positive, so air enters through the filtered front rather than through gaps. If you see dust gathering around the rear ports and expansion slots, the case is running negative and you should raise intake speed or lower exhaust speed.

When you change fans, change one thing at a time. Run a repeatable load, such as a gaming session of the same length or a CPU stress test, and record the CPU, GPU and drive temperatures before and after. If the change moves the numbers by only a degree or two, the bottleneck is elsewhere, and the money is better spent on a different part of the chain.

Reading and Setting a Fan Curve

A fan curve tells the motherboard how fast to spin a fan at each temperature. A steep curve ramps up quickly and is loud, while a flat curve stays quiet and lets temperatures rise. Most boards let you set the curve in the BIOS or in the maker’s software. A good starting point for case fans is a low fixed speed until the CPU reaches the mid 50s Celsius, then a gradual rise. For the CPU cooler, add a short delay so the fans do not surge up and down with every brief spike, an effect often called fan hunting.

If you buy PWM fans such as the Noctua, ARCTIC or be quiet! models in this guide, the board can also run them at very low speeds that DC-controlled fans cannot reach. That is why a PWM upgrade can make a PC noticeably quieter even when the temperatures are unchanged. If a fan stops entirely at low settings, raise the minimum speed a little, since many fans stall below a threshold.

Finally, remember that safe temperature limits are set by the processor and graphics card makers. Check Intel, AMD and graphics-card maker documentation for the maximum temperature of your own parts rather than relying on a number from a forum post.

Frequently Asked Questions

What is the best PC cooling upgrade for the money?

For most builds a dual-tower CPU cooler gives the biggest improvement per dollar, followed by replacing weak case fans. If your temperatures are already fine, cleaning dust is the cheapest improvement.

Is an air cooler as good as an AIO?

For mainstream CPUs, a good dual-tower air cooler can match many AIOs while being simpler and quieter. For the hottest chips, a 360mm AIO usually has more headroom.

How many case fans do I need?

Most mid-tower cases do well with two or three intake fans and one or two exhaust fans. The arrangement matters as much as the number.

Can I use a thermal pad on my CPU?

No. CPUs need thermal paste or a phase-change material for a thin, even layer. Pads are for larger gaps on memory, VRMs and drives.

What thickness thermal pad do I need?

Match the original pad. Measure with a caliper if you can. Common sizes range from 0.5mm to 3mm, and a wrong thickness can stop good contact.

Are electric air dusters safe for PCs?

They are widely used for PCs, but unplug the PC, hold the fans still and keep the nozzle at a safe distance to avoid damage.

Will new fans make my PC quieter?

Often yes, if the new fans are PWM models that run slowly at idle. A good fan curve in the BIOS or software also reduces noise.

Which One Should You Buy?

If your CPU runs hot, buy the Thermalright Peerless Assassin 120 SE for the best value, the be quiet! Pure Rock Pro 3 for the quietest compact build, or the Noctua NH-D15 chromax.Black if your case has room. If the CPU is fine and the case is hot, choose the Noctua NF-P12 redux-1700 for a standard case or the ARCTIC P12 Slim for tight spaces. Add the ARCTIC TP-3 pad only if you are reseating an M.2 or memory heatsink, and use the IT Dusters electric blower to keep every part working as designed.

Sources

• Thermalright, be quiet!, Noctua, ARCTIC and IT Dusters product pages and listing specifications
• Noctua and ARCTIC support articles on fan mounting and thermal pads
• Intel and AMD socket and cooler compatibility documentation

Last updated: October 2026