Overview

The Thermalright Peerless Assassin 120 Digital (black) is a dual-tower, six-heatpipe air cooler topped with a digital screen cover. The short version: it targets builders who want solid air-cooling performance around the ¥9,000 mark and a bit of visual flair on the top cover.

On Amazon.co.jp it was listed at ¥9,138 as captured on 12 June 2026, with 26 reviews averaging 4.6 out of 5 (92% positive).

Both price and review counts move, so check the product page for current figures.

The Peerless Assassin 120 line is known for pushing dual-tower air cooling into a price bracket dominated by all-in-one liquid coolers. With no pump, there is no pump whine to develop over time and no coolant to worry about.

The Digital variant adds a top-cover display to that same basic formula. Exactly what the screen shows and how it is powered can vary between revisions, so confirm the listing photos and description before ordering.

Compatibility Guide

The product title explicitly states AM4 support, so Socket AM4 (Ryzen 1000–5000 series) is covered at least on paper. Whether AM5, LGA1700 or LGA1851 brackets are in the box depends on the specific listing — Thermalright coolers often circulate in multiple bracket bundles under similar names.

Check that your socket is listed in writing on the product page. If it is not, assume it is not supported.

With a cooler of this class, physical clearance causes more failed builds than socket compatibility does. Three things to verify:

Check Failure mode What to do first
Case max cooler height Side panel will not close Compare the case's stated CPU cooler height limit against the cooler's overall height
RAM module height Front fan collides with the heatsink Tall heatspreaders and RGB kits are risky; plan on raising the fan
First PCIe slot / VRM heatsink Contact with board-side hardware Especially relevant on Mini-ITX and boards with tall VRM covers

Dual-tower coolers commonly land near 160 mm tall. Most mid-towers accept that; slim and cube cases usually will not.

Look up your case's cooler-height limit before buying. The top-mounted screen may also tighten height and cable-routing constraints compared with the standard model, so if clearance is already marginal, consider the non-digital or a single-tower option instead.

One more practical point: the display typically needs power from inside the case. Confirm you have a free USB header or spare power connector before build day.

Product Info

The price was ¥9,138 on Amazon.co.jp as captured on 12 June 2026.

That figure moves with sales, points promotions and exchange rates, so treat it as a snapshot. The eBay entry is only a search link with no captured price, so grey-market pricing has to be checked listing by listing.

Reviews stood at 26 with a 4.6-star average (92% positive) as of 3 June 2026.

Note the sample size: 26 reviews is enough to read the general direction, but far too few to judge low-probability issues like DOA rates or batch variance. Read 4.6 stars as "no widespread complaints yet," not as a guarantee.

One caveat about the listing itself: the registered specification fields on this product page clearly contain data from a different product — laptop-stand attributes such as material, supported screen sizes, and stand dimensions. This article deliberately does not use those numbers.

For accurate dimensions and weight, consult Thermalright's own product page.

Product Disclosure (Amazon)

  • ASIN: B0DQG2RHLL
  • Note: This article covers a manufacturer-made product based on Amazon listing details.

How It Compares

Three alternatives are worth weighing:

  • The same series without the screen (e.g. Peerless Assassin 120 SE): same cooling concept, lower price, easier clearance. If looks are not a priority, this is the rational pick.
  • Single-tower air coolers (Cooler Master Hyper 212 family): more clearance headroom and far less RAM-interference risk, at the cost of thermal ceiling.
  • 240/280/360 mm AIOs: free up space around the socket if your case can mount a radiator, but cost more and add a pump as a wear part.

The case for this specific model rests almost entirely on wanting a top-cover display without giving up air cooling. If the screen does not appeal to you, spend the same budget elsewhere.

Best Use Cases

  • AM4 builders upgrading cheaply: coming from a stock or entry cooler on a Ryzen 5000 system, the drop in temperature and noise is immediately noticeable.
  • People who do not want to manage liquid cooling: no pump failure, no leaks, no service life to track.
  • Owners of tempered-glass cases: the top display only means anything if you can see it. In a solid-panel case it is wasted.
  • Anyone wanting upper-mid air cooling near ¥9,000: six heatpipes across two towers is genuinely strong for the money.

Before You Buy

Do not trust the registered specs on this listing. At the time of writing, the Amazon spec fields list "Material: aluminum," "Supported sizes: 11–17 inches" and stand-like dimensions — a CPU cooler has no supported screen size.

You will see the same mismatch when you open the page, so verify the product against the images, the title, and the manufacturer's official page before ordering. Listing errors like this are common and do not mean the product is defective, but sizing your case around those dimensions will absolutely cause problems.

Then there is the inherent trade-off of a heavy dual-tower cooler. The mass puts real load on the motherboard.

If you transport the PC often, either remove the cooler or lay the case flat. Installation uses a backplate, so if your case lacks a motherboard cutout you will have to pull the board out.

RAM interference is the classic post-purchase surprise. Raising the front fan clears tall modules — but that also raises overall height, which brings the side panel back into play.

You have to satisfy RAM height and case height limits at the same time, so do the arithmetic before ordering.

Finally, calibrate your expectations for the screen. It is a supplementary readout, not a source of information you cannot already get in software, and it adds one more cable to route.

Treat it as an aesthetic feature and you will be happier with the purchase.

Who Should Skip It

  • Owners of slim, cube, or small-form-factor cases — it likely will not fit
  • Anyone running a high-end CPU at sustained full load; this class of air cooler has a ceiling
  • Silence-first users, unless you are willing to tune the fan curves
  • Anyone indifferent to the display — the non-digital version is cheaper and easier to fit

FAQ

Q. Will it work on AM5 or Intel LGA1700? A.

The title only states AM4. Bracket bundles vary by listing, so confirm your socket appears in writing on the product page.

If it does not, treat it as unsupported.

Q. How do I know it fits my case? A.

Compare the case's maximum CPU cooler height against the cooler's overall height, and leave a few millimetres of margin in case you have to raise a fan over your RAM.

Q. What does the digital screen display? A.

Top-cover screens of this type usually show monitoring data such as temperature, but the exact behaviour varies by revision. Check the listing photos and description rather than assuming.

Q. Air cooler or AIO? A.

A 240 mm-or-larger AIO often has more thermal headroom, but this cooler has fewer moving parts and no meaningful service life to track. Decide based on your case layout and how long you plan to keep the build.

Q. How much weight should I give the 4.6-star, 26-review score? A.

That was the figure as of June 2026. It shows the general direction but the sample is too small to indicate defect rates.

Read current reviews yourself at purchase time.