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| Thread ID: 89544 | 2008-05-03 12:32:00 | Quick question about fans | EviLClouD (12981) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 665508 | 2008-05-03 12:32:00 | First off, if i only have 3 headers on my motherboard and have space for 5 case fans, is it possible to install and use 5 fans? As in, where does headers for 2 fans plug into? Secondly, if a fan is 3 pin, are you able to manually change the speed of it? And whats the difference between 3 and 4 pin fans? Thanks in advance |
EviLClouD (12981) | ||
| 665509 | 2008-05-03 13:09:00 | Get adapters to feed the extra fans from any spare Molex plugs, do you really want all the extra noise though? (and there'd be no speed control possible). I have a large (25cm, 10 inch) fan in the side of my case, runs at 600 RPM, very quiet. The 3wire fans are speed sensing on the third wire, and the 4wire would be for speed controlling, see here (www.pavouk.org). |
feersumendjinn (64) | ||
| 665510 | 2008-05-03 15:19:00 | (and there'd be no speed control possible) easy enuf to wire in a variable resistor if you really wanted to... |
drcspy (146) | ||
| 665511 | 2008-05-03 15:33:00 | easy enuf to wire in a variable resistor if you really wanted to... the speed controlled fans use PWM which uses digital pulses instead of analouge resistors, the 3 wire fans use the 3rd wire for tachometer/speed sensor, only 4 wired fans have speed controllers |
williamF (115) | ||
| 665512 | 2008-05-03 15:34:00 | yeh k what I meant was wiring a variable resistor onto a molex driven fan if needed ........ | drcspy (146) | ||
| 665513 | 2008-05-03 15:42:00 | even that has issues, first its only really changing the amount of current the fan gets and if the variable resistor cant handle the current on max speed (low resistance) which is slim but can happen on higher current fans the resistor will emit acrid smoke and sometimes fire. hence its better to use a NE555 timer set up as astable (infinitely oscillating) and a transistor driving the fan. using the variable resistor to adjust the frequency (simple PWM in some ways) | williamF (115) | ||
| 665514 | 2008-05-03 19:43:00 | Ok this is what I have done, just get a fan controller,you can get them in silver or black to match your computer case and you can get them in different sizes 3.5"(the floppy drive bay),5.25"(the cd/dvd drive bay).These are just examples.:cool::thumbs: Dragon Silver aluminium 3.5" VR RheoBus fan controller with blue LED Dragon 3.5" VR RheoBus (Silver) 3.5" Rheobus fan controller 4 channel outputs up to 4 fans. Silver aluminium face plate fit on any 3.5" bay. LED back light around the knobs. Adjustable output voltages from 7V ~ 12V DC each channel.Black aluminium baybus fan controller, adjust speed upto 6 fans Dragon 6 Ports Baybus Rev.2 (Black) DIY Bay bus speed adjustable fan controllers, controlling up to 6 fans in full/off/low speed. Low speeds are adjustable by VRs (range is 5.5v-11.5v). LEDs indicate each fan's status, in red/green/off. Now with Black aluminium 5'25 bay face plate (no need drilling). These will take 3 pin fans so you can adjust the speed of the fans slow for internet,faster for gaming when tempertures rise etc. With molex plug fans they are ment to plug into the psu cable plugs (molex plugs),however you can get adopters to fit them,4 pin to 3 pin which you just plug into the end of the molex plug and then into the fan controller. Dragon (PM35SP-20) 4 pin to 3 pin fan adapter cable, 20cm long And if you need to make the back case fan cable longer to reach the fan controller then get this: Dragon (M3MF-30) Molex 3 pin male/female fan extension cable, 30cm long This is what I have done on my CM690 case. I have got 6 case fans in total,4 hooked up to a fan controller and 2 pluged into the motherboard and all turned down to a good hearing level for me,my case is quiter then some cases that have less fans and no fan controller.:cool::thumbs: |
memphis (2869) | ||
| 665515 | 2008-05-03 23:35:00 | So memphis if i understand correctly, using a fan controller will allow me to install more fans? ie, plug fans directly into the controller with no need to plug into mb? Also, it will allow you to adjust fan speeds for 3 pin fans? | EviLClouD (12981) | ||
| 665516 | 2008-05-04 00:59:00 | Make sure your PSU can handle the extra output | Bantu (52) | ||
| 665517 | 2008-05-04 02:02:00 | PSU should handle any number of fans. if it doesn't you have other major problems. resistors or running it off 7v dosn't alwasy work to well. PWM controllers are so much better. the mount of fans is simply limit to $$$ |
tweak'e (69) | ||
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