Alphacool NexXxoS ST25 Full Copper 240mm Radiator

Slim Copper Radiator

The Alphacool NexXxoS ST25 is a 240mm full-copper radiator built for Mini-PC and Small Form Factor liquid-cooling loops. Its end chambers, water channels and cooling fins are all pure copper, a combination the supplier says no other maker uses. The 25mm slim profile fits tight chassis where thicker radiators cannot. It targets builders who want maximum thermal conductivity in a compact footprint.

Straightforward Mounting

The box includes three screw lengths: M3x30mm, M3x5mm and M3x35mm plus an Allen key, so you can match fan thickness and case material without hunting hardware. Copper is heavier than aluminium, so verify your mounting points can carry the extra mass. The 15 FPI fin density keeps airflow resistance low, meaning standard case fans work well without high static pressure. Follow the supplied instructions to avoid cross-threading the brass threads.

SFF Loop Builders

This radiator suits enthusiasts assembling custom loops in space-constrained cases who value copper’s 400 W/(mK) conductivity over aluminium’s 236 W/(mK). It is not for buyers who need a thicker core for higher total dissipation, nor for open-loop kits that expect aluminium components and proprietary fittings. Builders without room for a 240mm fan pair should look at smaller radiator formats.