Thermalright Peerless Assassin 120 SE RAM Height Clearance Guide
The Thermalright Peerless Assassin 120 SE is widely recognized as one of the best value dual-tower CPU air coolers on the market. Featuring six 6mm heatpipes and dual TL-C12C 120mm fans, it delivers thermal performance that rivals coolers twice its price. However, achieving optimal fitment requires evaluating memory heatspreader height against the front fan’s mounting position, as tall RGB DDR5 RAM modules force fan elevation changes that impact total cooler height inside your PC case.
Physical Specs and Clearance Measurements
The table below breaks down the millimeter measurements governing fitment of the Peerless Assassin 120 SE with tall RGB memory modules.
| Component / Metric | Dimension Spec | Fitment & Clearance Impact |
|---|---|---|
| Peerless Assassin 120 SE Base Height | 155.0 mm | Native height from CPU IHS to top of heatpipes |
| Default Front Fan RAM Clearance | 35.0 mm | Maximum RAM height before fan elevation |
| Teamgroup T-Force Delta RGB DDR5 Height | 42.5 mm | Exceeds stock fan clearance by 7.5 mm |
| Front Fan Elevation Offset | +7.5 mm | Required fan shift up wire clip notches |
| Adjusted Total Cooler Height | 162.5 mm | New overall height requirement for chassis |
RAM Clearance and Fan Offset Mechanics
The Peerless Assassin 120 SE features step-cutouts on the lower fin array designed to provide 46mm of clearance under the raw aluminum fin stack. However, the front 120mm fan sits lower than the fin stack in its default position, reducing active front-slot clearance to 35mm.
When installing Teamgroup T-Force Delta RGB DDR5 RAM height modules, which measure 42.5mm from bottom contact pins to top RGB lightbar tip, the front TL-C12C fan hits the top of the RAM heatspreader. To clear the memory, you must elevate the front fan up the fin tower by 7.5mm on its wire mounting clips. This elevation shifts total overall cooler height from 155mm to 162.5mm.
Chassis Clearance Compatibility
Before purchasing hardware, verify that your selected case accommodates the elevated 162.5mm height. For example, checking Corsair 4000D Airflow chassis CPU cooler clearance reveals a maximum CPU cooler headroom spec of 170mm, meaning the elevated 162.5mm Peerless Assassin 120 SE fits comfortably with 7.5mm of clearance to spare before hitting the tempered glass panel.
However, in compact mid-tower or SFF cases with strict 155mm to 160mm limits, builders should consider these adjustments:
- Move Fan to Rear: Unclip the front fan and mount it to the rear of the second cooling tower as a pull fan, provided your motherboard VRM shroud clearance allows it.
- Use Low-Profile RAM: Opt for non-RGB memory modules under 35mm in height (such as Teamgroup T-Create Classic or Corsair Vengeance DDR5 Non-RGB) to keep the front fan flush at 155mm height.
- Single-Fan Operation: Run the cooler with only the middle fan installed between the two fin towers. Thermal output increases by less than 2°C on 65W to 120W processors.
Motherboard Layout and Socket Positioning
The asymmetric design of the Peerless Assassin 120 SE positions the heatpipes away from the top PCIe slot. Installing this cooler on an MSI MAG B650 Tomahawk WiFi ATX motherboard ensures complete clearance over the primary PCIe 4.0 x16 slot and upper M.2 Shield Frozr heatsink while maintaining full clearance for motherboard VRM cooling blocks.