Quick Answer

For clean cable-managed builds, a good R350-R650 tower air cooler (Deepcool AK400, Thermalright Peerless Assassin 120) keeps a Ryzen 5/7 or Core i5/i7 below 80C under load. Reach for a R1,400-R2,500 240mm AIO only on a high-wattage chip like a Ryzen 9 or Core i7/i9.

Air vs AIO For This Use Case

A dual-tower air cooler like the Thermalright Peerless Assassin 120 SE (around R650) dissipates 220-250W and holds a stock Ryzen 7 7700 in the low-70s C, which is plenty for clean cable-managed builds. A 240mm AIO (R1,400+) only pulls ahead on chips pushing 200W+ or in a cramped case with poor airflow. Air also has no pump to fail and no liquid to worry about, which matters for a long-life build you do not want to babysit.

Fix First, Replace Second

Most cooling complaints are not a dead cooler. Dust between the fins acts like a blanket and can add 10-15C; a can of compressed air and a fin clean costs nothing. If temps stay high after cleaning, the thermal paste has likely dried out after 2-3 years. A R120-R250 tube of Arctic MX-4 or Thermal Grizzly Kryonaut and a fresh pea-sized application usually recovers the lost headroom. Replace the cooler only if the heatsink is warped or the fan bearing is grinding.

How To Decide Before Checkout

Spend where it removes a daily annoyance, and save where the upgrade is invisible in use. For clean cable-managed builds, that usually means a mid-tier pick from a known brand rather than the cheapest or the flagship. Most SA buyers shop online and have it couriered, so check the box dimensions before checkout.

FAQ

How do I know if my cooler is failing or just dirty?

Clean the fins and re-seat with fresh paste first. If temps drop back under 80C you only had dust or dried paste; if they stay high under load, the heatsink or fan is the problem.

Do I need an AIO or is air enough?

Air is enough for almost every Ryzen 5/7 and Core i5/i7. An AIO only earns its R1,400+ price on a 200W+ chip or when case clearance forces a low-profile build.

How often should I redo thermal paste?

Every 2-3 years, or whenever you remove the cooler. A R150 tube of MX-4 covers several applications and is the cheapest temperature fix you can buy.

TIP

quick HWMonitor stress check; if load temps top 85C, clean the fins and re-paste with a R150 tube of MX-4 before spending on a new cooler.