Can you replace the pre-installed AIO inside NZXT H1?
Fit an appropriate AIO or low-profile air cooler
The NZXT H1 comes equipped with a 140 mm AIO water cooler that will be able to handle even the high-end desktop-class processors, including the Intel Core i9 and AMD Ryzen 9 series. Should you want to replace it with an aftermarket solution, it's better to go with another AIO, though a low-profile air blower will work too.
When looking for a replacement AIO, it's important to consider the tubing. The H1 is a super-compact chassis and there's not a whole lot of clearance between the CPU and the case panel. The AIO included with the H1 is designed around this problem by using 90-degree rotating fittings on the radiator as well as the cooling block. Most AIOs do not have 90-degree rotators on the radiator.
It's worse for low-profile coolers. You'll want a decent enough blower, but you're restricted to around 65 mm of clearance if using a case fan in place of the AIO radiator. Our advice? Use the included AIO or if it ceases to work and is out of warranty, purchase a replacement from NZXT.
Compact PC case with bags of potential
The NZXT H1 comes equipped with a premium 140mm AIO cooler. While you could swap out the fan for something a little quieter, it's not recommended to replace it with an aftermarket solution unless you know for certain it'll fit without issue.
