Thermalright Peerless Assassin DDR5 RAM Clearance in Lian Li O11 Vision

Quick Answer

Thermalright Peerless Assassin can clear DDR5 RAM in a Lian Li O11 Vision only when the front fan position and memory heat-spreader height leave enough room. Use exact measurements, not product photos: 360mm radiators, 155-165mm air coolers, 3-slot graphics cards, and tall RGB DDR5 can all collide in premium glass cases. Budget around R1,200-R3,500 for strong air cooling, R2,500-R5,000 for 360mm AIOs, and much more for high-end GPUs.

Measurements that matter

Check case CPU cooler height, GPU length, GPU thickness, radiator positions, radiator thickness with fans, and the power cable bend near the side panel. DDR5 kits with tall RGB heat spreaders can add several millimetres exactly where a front fan or tube run wants space. The safe method is to compare the product spec sheets before checkout.

How to avoid a bad fit

Plan the build as a side view and a top view: motherboard socket, RAM slots, radiator, fans, graphics card, and cable exits. A 360mm AIO may fit one mount but block access to headers or force awkward tube routing. A large GPU may clear the case length while still pressing against glass, riser spacing, or a 12V-2x6 power cable bend.

SA buyer checks

Returns are painful when a glass case, cooler, or GPU has already been opened and partly installed. For courier delivery in South Africa, inspect panels before building and keep all foam, screws, brackets, and packaging until the system passes a full temperature test. If the parts are close, choose the smaller cooler or a case with more clearance.

FAQ

Is manufacturer clearance enough?

It is the starting point, not the full answer. You still need to add fan thickness, RAM height, cable bend, and the exact graphics card model.

Should I choose an AIO or air cooler for this case?

Choose a 360mm AIO when the case mount and tube route are clean. Choose air cooling when you want fewer cables, simpler maintenance, and the case has enough height for the tower cooler.

What should I measure before ordering?

Measure CPU cooler height, radiator space, GPU length, GPU slot thickness, RAM height, and side-panel cable clearance. A few millimetres can decide whether the build closes properly.