CPU Fan Connect to Pwr supply or MoBo?

Soundster · Sep 24, 2003

Is it better to connect the CPU fan directly to the power supply? or using the MoBo connector so that rpm can be modified or adjusted?

Zeke968 · Sep 24, 2003

If you are overclocking it's best to connect it directly to the psu for better stability. If you want to adjust the fan speed I'd recommend getting a front panel fan speed controller or get a fan with a rheostat built in, like the thermaltake smart fan II.

Soundster · Sep 24, 2003

Thanks!

eobard · Sep 25, 2003

Your motherboard manual should have a maximum wattage listing for the onboard fan headers, compare that to the wattage requirements of the fan and you may find that your fan wants more than the board is rated to give it. If so then you may burn up the fan header (and perhaps the rest of the motherboard) if you hook the fan up to it.

Susquehannock · Sep 25, 2003

I solved a random shutdown problem with my KG7 by
connecting the CPU fan directly to the PSU rather
than the fan header.
Only problem is, ... no RPM reading that way. That's where
the split wire mod comes in.

Soundster · Sep 25, 2003

How do you do a split wire mod?

Soundster · Sep 25, 2003

Does anyone use a case fan with 4 pin socket to cool their CPU? and if so how do they monitor the RPM?

hagrid · Sep 25, 2003

Soundster said:
How do you do a split wire mod?

You can splice the wire that reads your RPM from your fan and connect it to the MB header. I am not sure if you need to use the ground wire also, but it isnt too hard to do.

eobard · Sep 25, 2003

hagrid said:
You can splice the wire that reads your RPM from your fan and connect it to the MB header. I am not sure if you need to use the ground wire also, but it isnt too hard to do.

Nope, just the RPM wire needs to go to the motherboard header, the other two go to the molex.

pik4chu · Sep 25, 2003

Soundster said:
Does anyone use a case fan with 4 pin socket to cool their CPU? and if so how do they monitor the RPM?

Do you need help with one or are you just curious?

And I cant imagine what the 4th wire is for? temp sensor? unlikely. There should be a black, red wire atleast. then there can be any of the following; yellow, blue, white. generally its yellow but Ive seen all these colors. this third wire is most of the ltime the RPM sensor for the fan.

Soundster · Sep 26, 2003

So I think what an ideal CPU fan is: a case fan (4pin connect to the PSU) with sensor (modded using a 3 pin header kit) that plugs into the motherboard header.....I wonder if any store would sell that pre configured.....

crion · Sep 26, 2003

smartfan 2? or am i lost? i actually don't remember if i bouth an extra molex connector kit or if i got that with the smartfan :/

pik4chu · Sep 26, 2003

crion said:
smartfan 2? or am i lost? i actually don't remember if i bouth an extra molex connector kit or if i got that with the smartfan :/

Yes, smartfan two has that ability.

And here is a little diagram for spliting the connectors on a fan.. just for clarification in case you weren't sure

bk94si · Sep 26, 2003

They sell all kinds of adapters and they are cheap. Not worth making one imo.

http://svc.com/conad.html

This is the one I bought.

http://svc.com/3pinto4pinad1.html

pik4chu · Sep 26, 2003

*edit* oh oops...hehe, maybe I should try looking at it harder

but if you got the stuff no need to spend a couple dollars to ship one out to you..I am a fan of DIY

bk94si · Sep 26, 2003

It splits the normal MB connector into a standard 4 pin connector and a MB connector that only has the rpm connector on it. :shrug:

CPU Fan Connect to Pwr supply or MoBo?

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