Pro/Forums - View Single Post - higher cfm fans on heatercore-worth it??

|kbn| · 03-14-2004, 06:31 PM

If you can cope with the niose and want more cfm you can use the -12v line from your psu (pin2, blue pin on ATX connector) with the +3.3v, +5v or +12v to get a pd increase. This gives 15.3v, 17v or 24v. Normal 12v fans *might* burn out after a while at 24v but its likely they wont, I have tested it with a 80mm ystech and it works well and pushes a very high cfm. There is only one warning though, most ATX psus have weak -12v rails, and weaker -5v rails. Measure the current the mobo is using on -12v to amke sure there is enough spare, or disconnect that pin from the mobo. You could be able to run 3 or 4 80mm fans from -12v but mot many more.

03-14-2004, 06:31 PM	#5
\|kbn\| Cooling Savant Join Date: Feb 2004 Location: W. Sussex, UK Posts: 329	If you can cope with the niose and want more cfm you can use the -12v line from your psu (pin2, blue pin on ATX connector) with the +3.3v, +5v or +12v to get a pd increase. This gives 15.3v, 17v or 24v. Normal 12v fans might burn out after a while at 24v but its likely they wont, I have tested it with a 80mm ystech and it works well and pushes a very high cfm. There is only one warning though, most ATX psus have weak -12v rails, and weaker -5v rails. Measure the current the mobo is using on -12v to amke sure there is enough spare, or disconnect that pin from the mobo. You could be able to run 3 or 4 80mm fans from -12v but mot many more.