# How many molex connectors can you chain together?

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April 3, 2008 11:35:08 PM

I was wondering how many molex connectors you can safely chain together? For example, if I hook up one molex connector from the PSU to a bunch of fans, how many can I safely chain together? Thanks.

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April 3, 2008 11:41:02 PM

totakeke said:
I was wondering how many molex connectors you can safely chain together? For example, if I hook up one molex connector from the PSU to a bunch of fans, how many can I safely chain together? Thanks.

That depends on how much power each fan draw, and your psu rail ratings.
April 3, 2008 11:41:08 PM

I find that 3 fans or 1 major component + 2 fans works well, though I would only connect 2 major components together at once.
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April 3, 2008 11:42:05 PM

The_Blood_Raven said:
I find that 3 fans or 1 major component + 2 fans works well, though I would only connect 2 major components together at once.

How major is that component?
April 3, 2008 11:56:15 PM

Hard drive, CD-rom, floppy, ext power for sound card etc.

Fans you should be able to get away with more then 3
April 4, 2008 12:14:06 AM

How long is a piece of string??

It all depends on how powerful is your PSU on the current rail, the quality of the connectors, how much current your devices draw at start-up, idle and load, etc etc...
April 4, 2008 12:26:36 AM

This makes me want to see how many fans I can chain together on an old 250W power supply as a test...
April 4, 2008 12:46:08 AM

Lord Gornak said:
This makes me want to see how many fans I can chain together on an old 250W power supply as a test...

As darkguset suggests the results will vary with fan power draw so when you get an answer it wont be absolute.

Wont all molex connectors run of the same rail?
April 4, 2008 4:02:28 AM

Hmmmm... to take a guess (being safe that is), typically you would have 2 or 3 4pin molex on one rail, which would can hook up 2 HDs and 1 DVD/CDROM. Basically that would be around 20-30W per HD or DVDROM.

Soooo... 60-90W roughly on a single rail. If you have fans that are rated 3W a fan, to equal 60W that would be 20 3W fans.  . o O (just the thought of running 20 fans)
April 4, 2008 4:37:11 PM

Heck, with that many fans you might be able to get the computer to hover.

Here's a question though: if you're adding fans, should the fans be at the beginning of the chain or at the end (after the 'major' component has been powered)?
April 4, 2008 4:56:19 PM

it does not matter since all the part are connected parallel together.
April 4, 2008 4:58:54 PM

I don't think it would really matter, except what would give your better cable management.
April 4, 2008 6:21:31 PM

As I stated in my first post, for fans only use 3 together on one connector, and only 4-5 on 1 cable. Also that is only if there are no major components on the that cable, CD/DVD drives, HDDs, floppy, extra cards, motherboard, anything that is not a fan or cathode really. I use a PC P&C 750w, so Im using the best for that wattage and one of the absolute most reliable power supplies money can buy, and I am still careful about this. If your system is using 10 or more fans, then a lot of people use 5.25" power supplies and hook up 3-5 fans to them so you are not hurting the rest of your system.
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