Question How many case fans is sufficient for build?

[whentoquit]

I decided to buy a GX601 Asus ROG Strix Helios case, with Asus ROG Strix X570-F Motherboard, AMD Ryzen 9 5900x CPU, Deepcool Assisin IV cooler along with my present Evga Geforce GTX 1070. My question is how many case fans would be sufficient for this build? I believe the motherboard will support 2 chassis fan connectors and 1 CPU fan connector, the CPU Cooler does have 1 fan. The case comes with 3- 140mm front fans and 1-140mm rear fan. I heard that because the front of the case is not really open that the air flow is somewhat restricted, probably why there are 3 fans up front. Should I just buy 2 more 140mm fans and stick them in the back or should I buy two sets of three fans with connectors for back and top?

 

[Phaaze88]

It varies; there is no solid number.

Should I just buy 2 more 140mm fans and stick them in the back or should I buy two sets of three fans with connectors for back and top?

Catch 22.
A)Leave the config as is.
B)Add more to assist the gpu cooler, but screw with the air fed to the cpu cooler.
[R9 5900X and GTX 1070 both yield higher average boost curves with lower temperatures.]

 

[PiersPlowman]

I'd say two front intake fans and one rear exhaust will be enough. They don't have to be fast fans, either; 800-1200 RPM is enough. Depends on how tolerant you are of noise.