[GUIDE] Quiet fan replacement for AORUS Gaming Box GTX 1080/1070
@pessimistickarma, Just the two 2 Noctua NF-A4x10 FLX fans. Each fan comes a "omni join" clip, so I just used both those to wire the fans together as there is only 1 header. The whole process is pretty easy. It is definitely worth the upgrade as it makes a huge difference in noise control.
As for upgrading the PSU fan, it is a bit too intrusive for me. I can live with the noise under header load. Under light load, it's pretty quiet now with just the two fans replaced.
@pessimistickarma, you could use a fan splitter. That would be the easy way. There is only 1 fan header and you are trying to power 2 fans. I didn't want to spend any money so I didn't use a splitter. Instead, got creative with the stuff in the Noctua kit. I connected 1 omni join to each fan with provided connector, then wired the open ends of both omni joins together with a cut 3.2 pin adapter (also provided in the kit, but cut myself).