Overview
Thermalright, a Taiwanese cooling specialist with over two decades of history, brings the Assassin King 120 SE as a single-tower air cooler aimed at budget-conscious builders. It packs four 6mm copper heat pipes and a 120mm PWM fan into a compact 148mm-tall package, delivering solid cooling performance at an astonishingly low price point—often under $30 USD. This cooler is designed to handle mainstream CPUs like the Ryzen 5 and Core i5 series, making it a popular choice for first-time PC builders and those upgrading from stock coolers.
The Assassin King 120 SE supports a wide range of sockets, including Intel LGA 1700/1200/115x and AMD AM4/AM5, ensuring compatibility with most modern platforms. Its 120mm fan, the TL-C12C, spins up to 1,550 RPM with a noise rating of just 25.6 dBA, striking a good balance between airflow and acoustics. The S-FDB bearing promises a long service life of 20,000 hours, adding to its value proposition.
In terms of market positioning, this cooler sits firmly in the entry-to-mid-range segment. It's not meant to tame flagship CPUs like the Core i9 or Ryzen 9 under sustained all-core loads, but for the vast majority of gamers and productivity users running mid-tier processors, it offers more than enough cooling headroom at a fraction of the cost of larger air coolers or AIO liquid coolers.
Compatibility Guide
- Socket Support: Intel LGA 1150/1151/1155/1156/1200/1700, AMD AM4/AM5. Note that LGA 1851 (Core Ultra 200 series) is NOT supported. If you're building on the latest Intel platform, look for a cooler explicitly compatible with that socket.
- Memory Clearance: The single-tower design keeps the fan offset away from the RAM slots, so most standard-height DDR4 and DDR5 memory modules fit without issue. However, very tall RAM with large heat spreaders (e.g., Corsair Dominator Platinum) may require moving the fan slightly upward or using the second DIMM slot from the CPU.
- Case Fit: At 148mm tall, this cooler fits in most mid-tower cases (e.g., Fractal Design Pop Air, NZXT H5 Flow, Corsair 4000D). Always check your case's maximum CPU cooler height before purchasing. Some compact ITX cases may have clearance issues.
- Backplate: Intel LGA 1700 requires the included backplate; AMD AM4/AM5 uses the stock motherboard backplate.
Product Info
- Release Date: 2022 (still actively sold)
- Price Range: Approximately $25–$35 USD / ¥2,000–¥3,000 JPY
- Warranty: 1 year (varies by retailer)
- Cooling Method: Air, single-tower
- Fan: TL-C12C (120×120×25mm), 4-pin PWM, max 1,550 RPM ±10%, 66.17 CFM, 25.6 dBA
- Heat Pipes: 4×6mm, AGHP III (anti-gravity) technology
- Bearing: S-FDB (fluid dynamic bearing), rated for 20,000 hours
- Rated TDP: ~180W (manufacturer estimate)
- Market Position: Entry to mid-range. Ideal as a stock cooler replacement or for budget builds where every dollar counts.
Best Use Cases
- Budget Gaming PC Builder: Pair this with a Ryzen 5 5600X or Core i5-12400F for a quiet, cool, and affordable setup. It handles gaming loads with ease and is much quieter than the stock cooler. Not recommended for Core i7/i9 or Ryzen 7/9 under sustained all-core workloads.
- Silence-Oriented User: At max 25.6 dBA, this cooler is nearly inaudible in a typical room. The PWM fan ramps up smoothly under load, so you won't hear sudden fan noise spikes. If you need absolute silence, consider a larger air cooler or a 240mm AIO.
- Compact Build Enthusiast: The 148mm height fits many mid-tower and some Mini-ITX cases. It's a great choice for small-form-factor builds where space is tight but you still want decent cooling. Double-check your case's CPU cooler clearance before buying.
- First-Time PC Builder: The installation process is straightforward, with clear instructions and all necessary mounting hardware included. The price is low enough that mistakes won't break the bank, making it a safe choice for beginners.
Things to Consider
- LGA 1851 Not Supported: If you're planning to build with Intel's Core Ultra 200 series (Arrow Lake), this cooler won't work. You'll need a cooler that explicitly supports the LGA 1851 socket.
- Cooling Ceiling: The ~180W TDP rating means it's not suitable for high-end CPUs like the Ryzen 9 7950X or Core i9-14900K under sustained all-core loads. For those chips, step up to a dual-tower air cooler (e.g., Thermalright Peerless Assassin 120 SE) or a 240mm+ AIO.
- Check Included Mounting Kit: Some retailers may sell versions without the LGA 1700 bracket. Always verify that the package includes the correct mounting hardware for your socket before purchasing.
- Competition: In the same price bracket, you'll find coolers like the ID-COOLING SE-214-XT and Arctic Freezer 34 eSports. The Assassin King 120 SE edges ahead in noise levels and ease of installation, but performance is very similar across the board.
FAQ
**Q: Can I use this cooler with a Ryzen 7 7800X3D?
