Buyer rule
Start with socket support, case clearance, radiator space, and fan control
Choose by CPU heat target, radiator mount, tube route, fan thickness, socket support, case airflow, and whether a tower air cooler would be simpler.

240mm AIO prices
A 240mm AIO often fits more cases than larger radiators. It still needs socket support, tube reach, fan headers, and a mount position that does not hurt GPU airflow.
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Buyer rule
Choose by CPU heat target, radiator mount, tube route, fan thickness, socket support, case airflow, and whether a tower air cooler would be simpler.
Risk
The common mistake is buying a 240mm AIO for style when a tower cooler would fit better or when the case mount blocks the clean airflow path.
Amazon CPU cooler lanes
Use these lanes after CPU socket, cooler height, radiator mount, RAM clearance, fan headers, pump wiring, case airflow, GPU heat, and noise target are specific. Amazon has the current listing details, seller terms, shipping, returns, and exact product specifications.
Core lane for two-fan liquid coolers in mainstream cases.
Color lane for white builds with two-fan radiator support.
Small-build lane for cases where radiator placement is limited.
AMD-socket lane for Ryzen builds needing explicit bracket support.
Intel-socket lane for newer Intel boards and bracket planning.
Install lane for remounting, troubleshooting, or replacing old paste.