I am adding fans to my system 200mm to be exact and which is better I will have 4 lead but my motherboard has only 3 system fan headers and if connect them to the psu will they stay running even if the computer is off
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More aboutfan controlling
No, they will not run when the PC is off, but when it's on they'll be running at a constant 100%.
This should fit 4-pin fans (the fourth pin is only for controlling the speed so you won't be needing that).