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Techguy · 10-31-2002, 11:34 AM

I'm h20 cooling my p4 2.5 so I can hit the wonderful 3GHz mark. It's great! My PC is silent and 100% stable. I also run it at full load 24/7 with f@H, and I encode DivX and stuff overnight all the time.

Well.. the 2 Antec 92mm Smart fans started to rumble (first one and then a few weeks later the other) and now rumble after being on for a few min. The rumble is loud and very annoying where as before they were practically inaudible next to your ear.

So I pulled out 2 Panaflow 92mm FBA09A12L fans. These fans really push the air at low noise. They push a LOT more air than the Antec's did. Well, when I put them on my heater core, they become very loud (air rushing, not any whine noises). So I tried them at 7V instead of 12V. They become 100% silent, but push less air than the Antec fans. So I was wondering how I could achieve a happy medium of air flow/noise somewhere in the 12 to 7V range.

it seems like PWM would be better than using a rheostat based devise, but I don't know this. Can any one share their experiences with both. pH, perhaps?

Also, I was looking at PWM controllers.
retail product:
http://www.natriumtech.com/products.php?pid=1
DIY:
http://www.cpemma.co.uk/pwm.html

I could do the DIY with a little help (I'm @ a school for engineers (GATech) and my dad owns a business that manufactures surface mount stuff, but they still do some thru-hole stuff too), but I don't know my way around circuit diagrams as well as I should. The DIY link looks like it can also vary the speed of the fan like the retail (but in an analog and not digital control). Is this right?
Also, if I used the DIY approach, how would I control 2 fans? would I need 2 of these?

Does any one know of any other retail PWM control devices?

now onto rheostat based stuff:
http://www.vantecusa.com/nxp101.html
that looks nice, and I'm pretty sure it's not PWM.
any other good rheostat based devices?
I've seen the cliff's bay bus guides too, so I can look into DIY for this as well.

Thanks and I hope someone can answer this barrage of questions!
-Russell

10-31-2002, 11:34 AM	#1
Techguy Cooling Savant Join Date: Nov 2001 Location: Suwanee, GA Posts: 130	Pulse Width Modulation and other fan Q's I'm h20 cooling my p4 2.5 so I can hit the wonderful 3GHz mark. It's great! My PC is silent and 100% stable. I also run it at full load 24/7 with f@H, and I encode DivX and stuff overnight all the time. Well.. the 2 Antec 92mm Smart fans started to rumble (first one and then a few weeks later the other) and now rumble after being on for a few min. The rumble is loud and very annoying where as before they were practically inaudible next to your ear. So I pulled out 2 Panaflow 92mm FBA09A12L fans. These fans really push the air at low noise. They push a LOT more air than the Antec's did. Well, when I put them on my heater core, they become very loud (air rushing, not any whine noises). So I tried them at 7V instead of 12V. They become 100% silent, but push less air than the Antec fans. So I was wondering how I could achieve a happy medium of air flow/noise somewhere in the 12 to 7V range. it seems like PWM would be better than using a rheostat based devise, but I don't know this. Can any one share their experiences with both. pH, perhaps? Also, I was looking at PWM controllers. retail product: http://www.natriumtech.com/products.php?pid=1 DIY: http://www.cpemma.co.uk/pwm.html I could do the DIY with a little help (I'm @ a school for engineers (GATech) and my dad owns a business that manufactures surface mount stuff, but they still do some thru-hole stuff too), but I don't know my way around circuit diagrams as well as I should. The DIY link looks like it can also vary the speed of the fan like the retail (but in an analog and not digital control). Is this right? Also, if I used the DIY approach, how would I control 2 fans? would I need 2 of these? Does any one know of any other retail PWM control devices? now onto rheostat based stuff: http://www.vantecusa.com/nxp101.html that looks nice, and I'm pretty sure it's not PWM. any other good rheostat based devices? I've seen the cliff's bay bus guides too, so I can look into DIY for this as well. Thanks and I hope someone can answer this barrage of questions! -Russell __________________ My only PC is a PII 333 with 256MB RAM a GeForce2 MX 200, and 30GB's of 7,200rpm ATA/66 goodness. And yes, I know it sucks.