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Case fan to psu.
If your pc case does not have a vent for the psu s fan then you should install the psu with its fan facing upwards.
Attach the case fan to the vented rear panel.
Yup connectors as labeled fan1 fan2 fan3 etc dont need to buy any molex cables and stuff right.
These are 3 pin fans will they connect to this 4 pin speed controller.
Power down the computer and turn the power switch off on the power supply which is typically situated on the back of the computer tower near the ac power cord.
Some psu shroud do come with top vents that may allow you to position your psu fan up but if the bottom vents are given then it is better that you should keep the fan in.
If your pc case has some sort of grill below where the psu sits then you should install your psu so that its intake fan is facing towards it.
Gather excess cabling together and tuck them away in an empty space such as an unused hard drive mount in front of the power supply.
Generally the psu shroud is a solid metal cover with no vents mostly so in such cases the position of the fan should remain down only regardless of anything.
Position the fan over the vented area.
Connect all the fan wires to the fan controller right.
Line the screw holes in the fan up with the venting holes on the back of the case.
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In other words your psu s fan will be facing downwards.
Yup just connect the fan controller to the two molex connectors as the fan controller gets power through 2 molex connectors.
Some computer cases come with a psu shroud or cover that acts as an extra protection for the power supply and also for the bottom mounted drives.
Continue arranging cables and zip tying them to the case until you are happy with your result.