Last reviewed: August 29, 2026

Few CPU cooler comparisons are as confusing as this one because the Phantom Spirit and Peerless Assassin look almost identical, cost similar amounts and come from the same manufacturer.

That is not a coincidence.

The Phantom Spirit is essentially Thermalright’s newer development of the same compact dual-tower formula that made the Peerless Assassin such a strong value.

The important difference is simple: the Phantom Spirit 120 SE uses seven heatpipes while the Peerless Assassin 120 SE uses six.

That can give the Phantom Spirit a small advantage when CPU heat output rises, but it does not suddenly make the Peerless Assassin a bad cooler.

Phantom Spirit vs Peerless Assassin: the quick answer

Winner for New Builds

Thermalright Phantom Spirit 120 SE

7 × 6mm Heatpipes 154mm Tall Dual Tower 2 × 120mm AM5 LGA1851

The one I would buy when both coolers cost roughly the same. It adds a seventh heatpipe while remaining one millimeter shorter, and its extra thermal headroom becomes more useful as CPU power rises.

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Buy When Meaningfully Cheaper

Thermalright Peerless Assassin 120 SE

6 × 6mm Heatpipes 155mm Tall Dual Tower 2 × 120mm AM5 LGA1851

Still one of the best-value air coolers available. For normal gaming CPUs and efficient Ryzen systems, its cooling capacity is already high enough that the Phantom Spirit’s small advantage may change nothing you can actually notice.

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Phantom Spirit 120 SE vs Peerless Assassin 120 SE specifications

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The most important difference: seven heatpipes vs six

The Phantom Spirit’s headline hardware change is its seventh 6mm heatpipe.

That gives the heatsink another route for moving heat away from the CPU base and into the fin stacks.

But heatpipe count is not a performance percentage.

Seven heatpipes instead of six does not mean the Phantom Spirit is 17% cooler.

Cooler performance also depends on:

• heatpipe placement,
• base contact,
• fin-stack geometry,
• fan behavior,
• CPU heat density,
• mounting pressure,
• and case airflow.

That is why the Phantom Spirit advantage is better described as extra thermal headroom rather than an entirely different cooling class.

Cooling performance: Phantom Spirit wins, but not by enough to make the Peerless Assassin obsolete

The Peerless Assassin built its reputation because it delivered dual-tower performance at a price normally associated with much smaller coolers.

Independent testing has shown the Peerless Assassin 120 SE capable of controlling more than 200 watts in the test conditions used by Tom’s Hardware while also maintaining low noise.

The Phantom Spirit came later and pushed the same basic formula slightly further.

In Hardware Canucks’ direct comparison, the Phantom Spirit generally came out ahead of the Peerless Assassin, particularly as thermal loads increased.

That is enough for the Phantom Spirit to win this comparison.

It is not enough to make a good Peerless Assassin installation worth replacing.

Which is quieter?

There is no major specification-sheet winner here.

Thermalright rates the standard fans on both SE models at the same maximum 25.6 dBA figure, although manufacturer noise figures should not be used as a substitute for controlled comparative testing.

The Phantom Spirit fans top out at 1500 RPM, while the Peerless Assassin’s reach 1550 RPM.

In practice, the cooler that keeps your CPU at the desired temperature with lower fan speed can be the quieter one.

That gives the slightly stronger Phantom Spirit a potential advantage with hotter workloads.

But on a moderate gaming CPU, both can be run with a sensible custom fan curve at very reasonable noise levels.

Size and case clearance: almost a tie

The Phantom Spirit 120 SE is officially 154mm tall.

The Peerless Assassin 120 SE is 155mm tall.

One millimeter is not enough to make case fit the reason I would choose one over the other in most systems.

The important question is whether your case has enough clearance for either cooler with some margin left over.

RAM clearance matters more than the 1mm height difference

Both are large dual-tower coolers that can overhang the DIMM area.

Tall RGB memory is therefore more important to check than the one-millimeter difference between the two heatsinks.

If the front fan interferes with the RAM, you can often raise it.

But doing that increases the cooler’s actual installed height.

So a cooler that is nominally 154mm tall may require more than 154mm of case clearance once the fan is moved upward.

Check your exact build before buying

Socket support is effectively a tie

Thermalright’s current product pages list both coolers for:

• AMD AM4,
• AMD AM5,
• Intel LGA115x,
• Intel LGA1200,
• Intel LGA1700,
• and Intel LGA1851.

For a current Ryzen or Intel desktop build, socket support therefore does not separate these two coolers.

Which one should you use with Ryzen 5?

Either.

For an efficient Ryzen 5 gaming build, the Peerless Assassin already provides much more cooling than a basic single-tower cooler.

I would buy whichever represents the better value.

If they are close, take the Phantom Spirit because there is no reason to give up the extra heatpipe.

Which one should you use with Ryzen 7 and X3D?

I would lean Phantom Spirit 120 SE for a new build.

Ryzen X3D processors do not necessarily consume enormous amounts of power while gaming, but their stacked-cache design makes thermal behavior different from a simple wattage comparison.

The Phantom Spirit costs little enough that its additional cooling margin is useful insurance without moving to an expensive premium cooler.

But if you already own a Peerless Assassin, keep it. A working PA120 SE remains a very sensible cooler for gaming-focused Ryzen 7 and X3D systems.

Which one should you use with Ryzen 9 or a hot Intel CPU?

This is where I would choose the Phantom Spirit.

A hotter processor running long all-core workloads gives the seventh heatpipe and newer design more opportunity to matter.

That does not mean the Peerless Assassin suddenly becomes incapable.

It means that if you are buying both coolers new and the prices are close, choosing the weaker of the two makes less sense when the CPU is the more demanding one.

Should you upgrade from a Peerless Assassin to a Phantom Spirit?

No.

This is probably the easiest decision in the entire comparison.

The Phantom Spirit is better enough to choose when both are sitting in your shopping cart.

It is not better enough to justify removing a correctly installed Peerless Assassin, cleaning the CPU, remounting another dual tower and spending more money.

If your existing Peerless Assassin:

• keeps the CPU below its thermal limit,
• does not throttle performance,
• and runs at a noise level you are happy with,

then the upgrade solves no meaningful problem.

Which exact versions are we comparing?

This article compares the Phantom Spirit 120 SE with the original Peerless Assassin 120 SE.

That distinction matters more in 2026 because Thermalright now sells many similarly named versions.

Those models are not all thermally identical.

For example, Thermalright’s newer Peerless Assassin 120 SE V2 uses thicker 28mm fans rated up to 1850 RPM rather than the original SE’s 25mm 1550-RPM fans.

So when comparing prices, make sure the product listing actually matches the model discussed here.

What about the Phantom Spirit 120 EVO?

The EVO is a different version with a more premium appearance and different higher-speed fans.

It should not automatically replace the 120 SE in this comparison.

Independent testing has shown that changing the fan and heatsink combination does not always improve noise-normalized performance in the way the specification sheet suggests.

For a value-focused build, the regular Phantom Spirit 120 SE remains the model I would check first.

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The decision in 30 seconds

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Phantom Spirit vs Peerless Assassin FAQ