Our Top Picks
The Noctua NH-D15 family and the Thermalright Peerless Assassin 120 are both dual-tower air coolers that can handle most gaming CPUs, and the usual rule is this: choose Noctua for the larger, quieter, longer-supported premium option, and choose the Peerless Assassin if you want most of that cooling in a smaller, lighter and much cheaper package. Which suits you depends on case clearance, noise goals and budget.
The Two Coolers in Brief
Noctua NH-D15 and NH-D15 G2. Noctua’s flagship air cooler line is a twin-tower design with two fans. The original NH-D15 is long established; the newer NH-D15 G2 is a revised design with larger fans and a heat pipe layout aimed at better contact and support for current sockets. The maker lists the G2 at a roughly 1500 rpm maximum fan speed, and spec comparison sites list its maximum noise at about 24.8 dB, with airflow around 91.6 CFM.
Thermalrlght Peerless Assassin 120 SE CPU Air Cooler, 6 Heat Pipes, Dual 120mm TL-C12C PWM Fans, Aluminum Heatsink Cover, AGHP Technology, for AMD AM4 AM5/Intel LGA 1700/1150/1151/1200/1851（PA120SE）
Chosen because it specifies 6 Heat Pipes and Dual 120mm TL-C12C PWM Fans.
View on Amazon
Thermalright TR Peerless Assassin 120 SE CPU Cooler, 6 Heat Pipes AGHP Technology, Dual 120mm PWM Fans, 1550RPM Speed, for AMD:AM4 AM5/Intel LGA 1700/1150/1151/1200/1851,PC Cooler
Chosen because it specifies 6 Heat Pipes AGHP Technology and Dual 120mm PWM Fans.
View on Amazon
Thermalright Assassin X120 Refined SE CPU Air Cooler, 4 Heat Pipes, TL-C12C PWM Fan, Aluminium Heatsink Cover, AGHP Technology, for AMD AM4/AM5/Intel LGA 1150/1151/1155/1200/1700/1851(AX120 R SE)
Chosen because it specifies 4 Heat Pipes and TL-C12C PWM Fan.
View on Amazon
Thermalright TR Peerless Assassin 120 Vision MAX ARGB Black CPU Air Cooler, Twin Tower Radiator 2150RPM,480x854 Resolving Power IPS Screen with 5’’,Computer Cooler for Intel lga1851/1700/115x,AM4/AM5
Chosen because it specifies Twin Tower Radiator 2150RPM and 480x854 Resolving Power IPS Screen with 5’’.
View on AmazonThermalright Peerless Assassin 120. This is a twin-tower cooler with two 120 mm fans in several versions: the Peerless Assassin 120 SE, SE ARGB, a V3 SE, and a Digital variant with a display. Spec comparisons list the PA120 SE at about 66 CFM and 25.6 dB maximum noise, and a newer V3 SE reaching 2000 rpm and about 29.8 dB. Those are manufacturer-style specifications, not independent noise-normalised measurements, so treat the figures as rough guidance.
Comparison Table
| Factor | Noctua NH-D15 / G2 | Thermalright Peerless Assassin 120 (SE / V3 SE) |
|---|---|---|
| Design | Dual tower, two fans | Dual tower, two 120 mm fans |
| Size | Larger and heavier; original NH-D15 listed around 150 mm wide and 1.3 kg | Smaller; PA120 SE listed around 110 mm wide and 0.7 kg |
| Listed airflow | About 91.6 CFM (G2) | About 66 CFM (SE) |
| Listed max noise | About 24.8 dB (G2) | About 25.6 dB (SE); higher on faster V3 |
| Cooling headroom | Generally at the top of air cooling | Close to premium air coolers in many reviews |
| Memory and GPU clearance | Larger footprint; check RAM height and case width | Easier fit in most mid-tower cases |
| Mounting and support | Long warranty and mounting kit support from the maker | Standard kit; check socket support for your board |
| Cost tier | Premium | Budget to midrange |
| Looks | Brown or chromax black variants | Black, with optional ARGB or digital display |
The size figures in the table come from spec comparisons of the original NH-D15, and G2 dimensions differ, so confirm exact measurements on the maker’s page for the version you intend to buy.
Who Should Pick Which
Gamers on a budget
The Peerless Assassin line is the natural pick. Reviewers frequently describe it as cooling close to far more expensive coolers, which leaves more of the build budget for the graphics card, where gaming performance is usually decided. A budget tier gaming CPU or a modern midrange chip is well within its capacity.
Quiet-focused builds
Noctua is known for low noise at a given cooling level, and its larger fans can run slower for the same airflow. If your PC sits on your desk and you notice fan whine, the NH-D15 G2 tier is where that effort tends to pay off. You can also lower the Peerless Assassin fan curve in BIOS to get a quieter result at some cost in temperatures.
Creators and heavy all-core workloads
Long renders, compiles and encodes hold the CPU at high power for extended periods. A larger cooler with more fin area and airflow gives more headroom, so the NH-D15 G2 has the advantage. Very high-power flagship processors can still exceed what any air cooler handles comfortably, in which case a liquid cooler is the usual alternative.
Small and mid-size cases
The Peerless Assassin is more likely to fit with tall memory modules and standard side panels. Noctua’s bigger cooler can interfere with memory slots, the top PCIe slot area or the side panel, so measure before buying.
How to Choose Without Guessing
- Measure clearance. Find the maximum cooler height in your case specifications and compare it with the cooler height from the maker.
- Check memory compatibility. Large coolers can overhang the first memory slot; read the maker’s memory compatibility chart or choose low-profile modules.
- Confirm socket support. Both brands list supported sockets such as AM5 and LGA1851 (Intel Core Ultra 200S); confirm your socket, and ask the maker if a mounting kit is needed.
- Match the cooler to the chip. A modest-power CPU like a Ryzen 7 9800X3D is within reach of either; a high-power flagship leans toward the bigger cooler or liquid cooling.
- Decide how much noise matters. Read independent reviews that test at matched noise levels, not just at maximum speed.
Common Myths
- “Only the premium cooler is good enough for a gaming CPU.” Most gaming processors do not push a cooler to its limit, and the cheaper dual-tower design is often sufficient.
- “Bigger always means cooler.” Beyond a point, fin density, fan pressure and mounting contact matter as much as size.
- “Spec-sheet dB tells you which is quieter.” Makers measure differently, so two numbers on a table are not directly comparable. Pitch, bearing quality and fan curve also affect how loud a cooler sounds.
- “Air coolers are outdated.” They have no pump to fail and are often as capable as small liquid coolers.
- “RGB or a display improves cooling.” It adds style only.
Practical Recommendation
If a case can accommodate it and noise matters most, the Noctua NH-D15 G2 is the safer premium choice. If you value cost and a smaller build, the Peerless Assassin 120 delivers strong cooling for a much lower outlay, which is why it has become a common recommendation in budget-conscious build discussions. Either one needs the correct mounting kit, a thin and even layer of thermal paste (included with both in most cases), and a sensible fan curve. Always turn off and unplug the PC before installing, and consult the motherboard and cooler manuals. Overclocking and BIOS changes can void warranties and cause instability, so keep any adjustments conservative.
Installation and Fan Tuning Notes
Both coolers perform best when the base makes even contact with the processor, so tighten the mounting screws gradually in a cross pattern, following the maker manual, and apply thermal paste in the amount the instructions describe. After installing, open the BIOS and set a fan curve that ramps smoothly with CPU temperature instead of jumping between speeds, which makes noise more tolerable. Menu names differ between motherboard makers, so consult the board manual. Keep case intake and exhaust balanced, because even the best tower cooler struggles with stale hot air inside the case. If temperatures look unusually high, reseat the cooler and check that any protective film has been removed from the base.
Frequently Asked Questions
Is the Peerless Assassin as good as the Noctua NH-D15?
In many reviews the Peerless Assassin comes close in cooling, though the Noctua generally leads in noise-normalised performance and airflow headroom. The gap matters most on high-power CPUs and in quiet builds.
Which is easier to install?
Both use standard cooler mounting procedures. Noctua’s kit is often praised for its documentation, while the Peerless Assassin’s smaller size leaves more room to work around the memory and motherboard.
Will either fit with tall RAM?
The larger Noctua coolers can restrict memory height or require shifting the front fan, while the Peerless Assassin is typically easier. Read each maker’s memory clearance notes for your exact module.
Which is better for AM5 and Intel Core Ultra 200S?
Both brands list support for current sockets, including AM5 and LGA1851. Confirm your socket on the maker’s compatibility page, because older boxes may not include the right bracket.
Do I need a liquid cooler instead?
Only for very high-power processors or when case airflow and clearance limit air coolers. For most gaming CPUs, either tower is adequate.
