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Adjusting fans RPM's

post #1 of 9
Thread Starter 
Hello,if i am using Molex connected fans can i in some way adjust rpm's from bios or some progam?
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post #2 of 9
Nope, you would have to do that through hardware (a fan controller or variable resistor).

If you want software control you have to plug the fan into a motherboard header that supports speed adjusting.
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post #3 of 9
Thread Starter 
hum ok,but what's the nature of the fans?when they operate on full rpm's?
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post #4 of 9
Quote:
Originally Posted by Ronhill View Post
hum ok,but what's the nature of the fans?when they operate on full rpm's?
They reach full rated speed at 12V. A good low speed setting is around 5V, too much lower than that and you risk the fan stopping alltogether.
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post #5 of 9
Quote:
Originally Posted by Ronhill View Post
hum ok,but what's the nature of the fans?when they operate on full rpm's?
hmmm... more cfm and more dba...?

Not sure what you meant.
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post #6 of 9
Fishie hit the nail on the head XD

you could try something similar to this (either do-it-yourself or order):
Swiftech switch thingie

not quite a "free" solution, but apart from some rewiring about the best i can think of @ 2am XD
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post #7 of 9
Thread Starter 
oh so i should need a fan controller ...thnx

edit:more cfm less temperatures
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My System
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QX-6700 @3.1ghz ABIT AW9-MAX Ati Radeon x1600 512MB 2gigs of KINGMAX ddr2 800 
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post #8 of 9
Quote:
Originally Posted by Ronhill View Post
oh so i should need a fan controller ...thnx

edit:more cfm less temperatures
well there's certainly other ways to control rpm's. fishie mentioned getting a molex-to-3/4 pin converter and using it if you motherboard has speed control
he also mentioned using variable resistors (more rewiring), or even wire a switch to change the voltage from 5-12 (or whatever in between if you add some more rewiring steps)

but unless they're high-end fans, you may be able to just get a small controller (3.5-inch bay) and hook up however many fans, using the convertors, it is you want to control. if they are high-end fans, like the bigger Delta fans, you may wanna check these out:
low-end mid-range high-powered
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CPUMotherboardGraphicsRAM
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CPUMotherboardGraphicsRAM
Core i7 3770k ASROCK Z77 Extreme6 2GB EVGA GTX670 8GB G. Skill DDR3-1600 
Hard DriveHard DriveOptical DriveCooling
128GB Samsung 830 SSD 1TB Samsung HD103SJ some Asus DVD/CD-RW Thermalright Ultima-90i w/ Ven. BTK 
OSMonitorKeyboardPower
Windows 7 Pro 64-bit 25.5" ASUS VW266H Logitech Wave Antec TruePower New 750W 
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Rocketfish Full Tower Logitech MX1000 
CPUMotherboardGraphicsRAM
X2 3800+ ASUS A8N-SLI Premium SLI 8800GTS 512MB 4x 512mb Corsair/Kingston 
Hard DriveOptical DriveOSMonitor
2x 250GB WD Caviar 2x NEC 3550 Windows XP SP3 ASUS 26" 16:10 
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by Firestorm252 View Post
well there's certainly other ways to control rpm's. fishie mentioned getting a molex-to-3/4 pin converter and using it if you motherboard has speed control
he also mentioned using variable resistors (more rewiring), or even wire a switch to change the voltage from 5-12 (or whatever in between if you add some more rewiring steps)

but unless they're high-end fans, you may be able to just get a small controller (3.5-inch bay) and hook up however many fans, using the convertors, it is you want to control. if they are high-end fans, like the bigger Delta fans, you may wanna check these out:
low-end mid-range high-powered
thnx i would definitely go with controller seems less complicated...can i connect mroe than one fan to the same controller?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
QX-6700 @3.1ghz ABIT AW9-MAX Ati Radeon x1600 512MB 2gigs of KINGMAX ddr2 800 
Hard DriveOSMonitorPower
seagate 300gb Win XP 64 Samsung Sync master 755DF Hiper 530W 
  hide details  
Reply
My System
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CPUMotherboardGraphicsRAM
QX-6700 @3.1ghz ABIT AW9-MAX Ati Radeon x1600 512MB 2gigs of KINGMAX ddr2 800 
Hard DriveOSMonitorPower
seagate 300gb Win XP 64 Samsung Sync master 755DF Hiper 530W 
  hide details  
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