RaPiDo987 Posted July 21, 2009 Posted July 21, 2009 Hey guys! I just got a Sunbeam RHK-BA Rheobus 5.25" Bay 4 Channel 20W Fan Controller Panel for my 3 x Scythe DFS123812-3000 "ULTRA KAZE" 120 x 38 mm Case Fans, 1 x Thermaltake A2018 120mm, and i don't know if the fan controller might be holding the fans back (bottle necking)? Any advice? Thanks Share this post Link to post Share on other sites More sharing options...
paulktreg Posted July 21, 2009 Posted July 21, 2009 (edited) Hey guys! I just got a Sunbeam RHK-BA Rheobus 5.25" Bay 4 Channel 20W Fan Controller Panel for my 3 x Scythe DFS123812-3000 "ULTRA KAZE" 120 x 38 mm Case Fans, 1 x Thermaltake A2018 120mm, and i don't know if the fan controller might be holding the fans back (bottle necking)? Any advice? Thanks Rated at 20W per channel with most fans at no more than 10W it's very unlikely it's holding the fans back. ( The Scythes are 7.2W and the Thermaltake is 5.76W). However I have to say the only reason I see in fitting a controller is to "hold the fans back" otherwise just wire them to 12V and let them go. There is a chance, depending on the design, that you cannot give the full 12V to the fans because the control circuitry will drop a small voltage across it. Cheers Paul Edited July 21, 2009 by paulktreg Share this post Link to post Share on other sites More sharing options...
IVIYTH0S Posted July 22, 2009 Posted July 22, 2009 Rated at 20W per channel with most fans at no more than 10W it's very unlikely it's holding the fans back. ( The Scythes are 7.2W and the Thermaltake is 5.76W). However I have to say the only reason I see in fitting a controller is to "hold the fans back" otherwise just wire them to 12V and let them go. There is a chance, depending on the design, that you cannot give the full 12V to the fans because the control circuitry will drop a small voltage across it. Cheers Paul no, Rapid's right I have the same fan controller for my Ultra Kazes that are on my TRUE and they definitely don't spin as fast as when they are hooked directly into the PSU's molex Share this post Link to post Share on other sites More sharing options...
paulktreg Posted July 22, 2009 Posted July 22, 2009 The fans are not getting the full 12V then and as previously mentioned this will be due to a volt drop across the speed control circuitry. Anyone got a voltmeter to see what the fans are getting at full speed? Cheers Paul Share this post Link to post Share on other sites More sharing options...
IVIYTH0S Posted July 22, 2009 Posted July 22, 2009 The fans are not getting the full 12V then and as previously mentioned this will be due to a volt drop across the speed control circuitry. Anyone got a voltmeter to see what the fans are getting at full speed? Cheers Paul I'll see if I can find mine and run the test myself, I know I have one. I just haven't had to use it in a while Share this post Link to post Share on other sites More sharing options...
mknwatt Posted July 22, 2009 Posted July 22, 2009 Whats the RPM showing? This would another indication to check. Share this post Link to post Share on other sites More sharing options...
IVIYTH0S Posted July 22, 2009 Posted July 22, 2009 Whats the RPM showing? This would another indication to check. it's not plugged into the motherboard and the fan controller can't display the rpm speeds so we don't know Share this post Link to post Share on other sites More sharing options...
mknwatt Posted July 22, 2009 Posted July 22, 2009 I use a sunbeam fan controller and built a jumper to read the fan speed from the mobo. Just another way to tell if the fans are at full speed in case someone doesn't have a dvm. Share this post Link to post Share on other sites More sharing options...
xPETEZx Posted July 23, 2009 Posted July 23, 2009 I dont understand, if you want the fans at full speed, why bother with a fan controller? I am sure the small voltage drop is gonna make NO impact on cooling performance. Share this post Link to post Share on other sites More sharing options...
IVIYTH0S Posted July 23, 2009 Posted July 23, 2009 (edited) I dont understand, if you want the fans at full speed, why bother with a fan controller? I am sure the small voltage drop is gonna make NO impact on cooling performance. Precisely , they cool just as well at 70 or 80 percent (assuming that's how much they're limited down to). I usually tune down the controller to the lowest it will go until the fans just about run out of power. They run so quiet Edited July 23, 2009 by IVIYTH0S Share this post Link to post Share on other sites More sharing options...
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