Question about AsRock Deskmini X300

A simple fan with a smaller heat sink is included. It corresponds roughly to the standard cooler supplied with the Athlon 3000G. As a rule, you can also install the standard fan of the 2200G/3200G/... However, some of them need to have the bezel ring clipped off. Quieter and more effective, however, is the NH-L9a-AM4, which is also nice and flat.

A suitable fan for the CPU is included, but I would also install a Noctua NH-La9.

My X300 comes with a CPU fan. But I also have a Noctua installed - for that you have to remove the board and unscrew it, unscrew the two plastic CPU holders on the top of the board and then screw on the Noctua from the back of the motherboard.

you don't get a cpu & fan with it. you still need a cpu.
I have installed this one:
AMD Ryzen 5 3400G (AM4, 3.70 GHz, 4 -Core)

I also have the fan from noctua, which fits just right:
Noctua NH-L9a-AM4 (3.70 cm)

No space for fans...;)