Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Modifying cpu fan to case fan.

Modifying cpu fan to case fan.

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - Modifying cpu fan to case fan.

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morfinel   06-04-2009 at 05:46:41 PM

Is there way to modify cpu fan to normal fan, I have two ex dell xps 120mm delta fans which have 4 pin motherboard connector, when I connect them to normal fan, 3 pin connector they work but they extremely fast and very noise, is there way to modifier them so they work under normal rpm or I would need speed control device, as well they are much slower on 4 pin Molex.
normal fan have, black, red, yellow this one have B, R,Y and blue.

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ausch30   06-09-2009 at 08:33:38 AM
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Look around for fan mods. By splicing the wires around you can make it run at 5v, 7v, 8.7v or it's normal 12v. Deltas are very high RPM/CFM fans so they really need to be regulated to keep the noise down. The 4th wire is the speed control so by you connecting to a 3 pin header the fan is always running full speed.
http://www.ocforums.com/showthread.php?t=372297
or you could do something like this and add spped control right into the wire
http://www.bit-tech.net/modding/20 [...] _control/1


Message edited by ausch30 on 06-09-2009 at 08:38:11 AM
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morfinel   06-09-2009 at 11:51:36 AM
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Thanks for replay as well I was thinking, will it help if I connect this fans to blue wire on cpu pin, can I overload the speed control by attaching two more blue wires?

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montyuk   06-09-2009 at 03:18:52 PM
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you need something to regulate the voltage that is supplied to the fans, id suggest looking on ebay for 'fan controller' and seeing whats out there.

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morfinel   06-09-2009 at 03:33:54 PM
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could I use one of this Link for 3 fans ? I would modify it so all 3 fans are connected to one fan controller. This first article is great and on 9 cm fan it work quiet however on 12 cm fan on 12 v my fan was very loud and was hovering on the desk lol even on 7 and 5 v it was still very powerful and loud.


Message edited by morfinel on 06-09-2009 at 03:43:19 PM
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ausch30   06-09-2009 at 06:14:08 PM
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The problem is hooking up 3 Deltas to a motherboard header. Most normal fans only consume a fraction of a watt but Deltas consume much more because they spin a lot faster. The motherboard header only supplies a couple watts so with high powered fans it's a good idea to have each on it's own header. Something like this would be good.

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morfinel   06-09-2009 at 06:20:23 PM
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Ok Thanks ATM I don't have money to spend on pc but will definitely buy speed control.

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