DonkeyOatie :
OK. Case fans can be connected to the two chassis fan headers and the PSU fan too if you want to. Each header can split and power at least two or three modern fans. There is also a splitter cable that handles 5 fans and uses Molex power from the PSU. you can install a fan controller which will handle 4 - ??? fans from a single header.
The 4 pin connectors are PWM which allows the computer to adjust the fan speed on need. The three pin fans use two for power, and the third is a sensor so we know what speed they are running.
Unless you are doing something exotic, you should have plenty of headers, one for case fan(s) built in, one for exhaust, and one to provide air for GPU. I have tow here, running off one header using a splitter,
It's easier to look At it the other way. You tell us what fans you want to run, ands we'll advise you how to do that best.
You can also connect fans directly to the PSU, but then they are on full-bore all the time.
I will have 6 fans in total. 2 already come with the case, buy i like to keep my components cool. 1 fan will be at the front of the case for intake, 2 at the top, and 1 at the back for exhaust, and 2 more fans mounted to the sidepanel for more intake, overall 3 intakes, and 3 exhausts.
I'm not sure how to power them all, i guess 2 of them from the chassis fan headers, but the rest... I thought of using that molex cable to just bring 1 or 2 of them, to power all the rest of the fans, but i don't know how these molex cables work. There are absolutely no guides that explain this properly, i think the molex connects to the psu to the 6 pin jack, or the hole with 6 holes on the psu, and then fans connect to the other end, but i don't see how they can connect to that.
How can these fan connectors connect to this:?
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Please explain this to me, very simply