My motherboard has sets of 3 pins for constant speed fans and sets of 4 pins for variable (pwm) fans.
I have been looking at some various options and I was interested in Sanyo Denki San Ace fans.
While I havent decided on which ones yet I am a little confused by some of the 3 wire ones saying they have variable speed controlled by the mother board and then there are other ones with 5 pins but only 4 wires.
For example these fans look like a bargain but they have 5 pins and doesn't mention anything about PWM.
Even if that one is overkill please humor me, I would really like to learn about fans but after researching for the best part of 5 hours my understands are still not very good.
I am to have my case with positive pressure and filters on the intakes to keep the dust out. I am after 2 x 120mm and 3 x 80mm fans.
PWM is not necessary as I plan to install the fans based on CFM to have positive pressure but I'm not against it either. I just want to keep dust out and keep it cool.
How do I know which fans I should get based on the wires?
3 = constant?
4 = contolled by bios?
5 = contolled by bios with extra plug that does nothing?