Abit fan connections

[DIG]

How many fan hook-ups does the Abit KT7A-Raid have? I went to their site, but couldn't find it.

[TT120]

It has 4 fan headers on it.

[DIG]

Follow-up question:
Does the BIOS show four separate readings of each fan's speed? Thanx

[TT120]

Nope, only 2. Fan 1 and 2 but not 3 and 4. kinda wierd but, o-well.

[DIG]

Strange....
This makes my next question a little bit more difficult since I can't monitor RPMs. What is the proper order (if there is one) to integrate a fan with a rheostat and a potentiometer. My hypo. would be [header > rheostat > potent. > fan] What kind of splicing is involved when adapting a 3 pin connector to a 2 line device? Thanx

[phiber]

i have the KT7a and i want to connect a Delta .48 amp
fan to it do u think i will blow the header

[TT120]

DIG (Mar 30, 2001 01:21 p.m.):
Strange....
This makes my next question a little bit more difficult since I can't monitor RPMs. What is the proper order (if there is one) to integrate a fan with a rheostat and a potentiometer. My hypo. would be [header > rheostat > potent. > fan] What kind of splicing is involved when adapting a 3 pin connector to a 2 line device? Thanx I think you have the order right although I dont understand why you want a potentiometer on there. I would have to defer to the more knowlegable in this group for that answer. The 3rd wire on a fan is just for rpm's and to hook it to a 2 wire system, dont use the rpm wire (usually the yellow one) just hook up the red and black wires.

[SickBoy]

You don't need a rheostat AND a potentiometer- just one or the other. I have detailed plans for building a universal 3 wire fan controller using a rheostat - if you want them I can email them. It's hard to explain how to do it without pics.

SickBoy

[Hoot]

Potentiometers and Rheostats are both resistors that you can vary the total resistance of. The Rheostat typically uses a spiral of nichrome (resistive) wire and a Potentiometer typically uses a line of carbon (also resistive). The difference is that by using nicrome wire, the rheostat can handle much more wattage than a simple carbon trace. The sacrifice is the rheostat value tends to jump in greater increments, whereas the potentiometer is more smooth due to the closer spacing of the carbon particles. As already mentioned in a previous post, you would not use both. It is redundant and the wattage of the pot will be exceeded long before the rheostat, causing the pot to burn open. Nuff said...

Hoot

[CoopertownBob]

jim (Apr 02, 2001 09:56 a.m.):
i have the KT7a and i want to connect a Delta .48 amp
fan to it do u think i will blow the header

I'm running a Delta Black Label on mine with no problems. 7000RPM's of sweet song. (others call it a loud noise ;-) )

[DIG]

SickBoy (Apr 02, 2001 12:50 p.m.):
You don't need a rheostat AND a potentiometer- just one or the other. I have detailed plans for building a universal 3 wire fan controller using a rheostat - if you want them I can email them. It's hard to explain how to do it without pics.

SickBoy

I wasn't think when I put "rheo AND pot"! I would appreciate that email...[domino@mediaone.net]. Also, has anyone had experience with adding fans that automatically turn-on when a specified temperature is reached? Thanx

[DIG]

DIG (Apr 03, 2001 05:58 p.m.):
SickBoy (Apr 02, 2001 12:50 p.m.):
You don't need a rheostat AND a potentiometer- just one or the other. I have detailed plans for building a universal 3 wire fan controller using a rheostat - if you want them I can email them. It's hard to explain how to do it without pics.

SickBoy

I wasn't think when I put "rheo AND pot"! I would appreciate that email...[domino@mediaone.net]. Also, has anyone had experience with adding fans that automatically turn-on when a specified temperature is reached? Thanx

[Ghettoweasel]

I was informed by Paul Howland, (unoffical Abit site) that each header is rated @ 6W each! Damn, good job Abit.