Single, double & triple radiators are the common sizes of radiators found in AIO water coolers.

The radiators are available in 120mm, 240mm, & 360mm sizes.

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You may buy their double & triple variants as 280mm & 420mm radiators.

Some of them are also significantly broader, accepting 140mm fans rather than 120mm ones.

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Quad radiators are also available, but they are extremely uncommon & not many people use them.

Midrange CPUs like AMD Ryzen 5 or the Intel Core i5 perform best with single radiators.

You should get at least a double or triple radiator for more powerful chips, such as AMD Ryzen 7/9 or the Intel Core i7/i9.

Last but not least, check whether the product you're buying is actually made by a respected company & whether it's any good.

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