Case fan connected through a 3pin to 4pin Molex adapter to PowerSupply isn't functioning properly.

F5F Stay Refreshed Power Users Overclocking Case fan connected through a 3pin to 4pin Molex adapter to PowerSupply isn't functioning properly.

Case fan connected through a 3pin to 4pin Molex adapter to PowerSupply isn't functioning properly.

Case fan connected through a 3pin to 4pin Molex adapter to PowerSupply isn't functioning properly.

A

AKA_uturn_GAME
Junior Member

4

09-27-2025, 07:59 PM

#1

Hello, I ran out of Fan Headers on my mitx mobo. It has one CPU fan header and one Sys fan header. The CPU fan header is plugged into the Corsair h105 pump, and the Sys Fan header is connected to the two fans on the radiator. I'd like another Case Fan, so I am plugging it directly into the Power Supply using a 3pin to 4pin molex adapter that I bought from Fry's. Turns out the Adapter says 5v on it.
I dont know why the Fan is not running. I've tried different ports on the PowerSupply, a different Fan (of the same type) but its not spinning. Is it because it's only 5v? Shouldn't it still spin but just slower? This is the adapter I bought:
http://www.frys.com/product/2585841?site...IN_RSLT_PG

A

AKA_uturn_GAME

09-27-2025, 07:59 PM #1

Hello, I ran out of Fan Headers on my mitx mobo. It has one CPU fan header and one Sys fan header. The CPU fan header is plugged into the Corsair h105 pump, and the Sys Fan header is connected to the two fans on the radiator. I'd like another Case Fan, so I am plugging it directly into the Power Supply using a 3pin to 4pin molex adapter that I bought from Fry's. Turns out the Adapter says 5v on it.
I dont know why the Fan is not running. I've tried different ports on the PowerSupply, a different Fan (of the same type) but its not spinning. Is it because it's only 5v? Shouldn't it still spin but just slower? This is the adapter I bought:
http://www.frys.com/product/2585841?site...IN_RSLT_PG

L

LilGhostz
Junior Member

27

09-27-2025, 08:49 PM

#2

It might not be sufficient to fully activate it.

L

LilGhostz

09-27-2025, 08:49 PM #2

It might not be sufficient to fully activate it.

R

Ramstein792
Junior Member

21

10-02-2025, 08:02 PM

#3

It might not be sufficient to fully activate it.

R

Ramstein792

10-02-2025, 08:02 PM #3

It might not be sufficient to fully activate it.

F

FlavourBurst
Member

59

10-03-2025, 04:30 AM

#4

Absolutely, it seems like you might be thinking about needing a 12V adapter.

F

FlavourBurst

10-03-2025, 04:30 AM #4

Absolutely, it seems like you might be thinking about needing a 12V adapter.