Originally Posted by ./Cy4n1d3\.
I was looking to possibly upgrade my stock Hyper 212+ fan to a dual blue LED setup. The thing is, I don't want something that will be too loud or have bad airflow. I just wanted to know how much of a performance increase I can get out of a 2 fan setup vs 1 (and if maybe it would help decrease noise in my rig). Also, I wanted to know how much of a difference the 3 pin vs 4 pin connector setup is, and what using a splitter would do to that (since my board only supports one four pin connector.).
Keep in mind I'm no expert.
But unless your motherboard is a rather high-end one and can control 3 pin and 4 pin with voltage change, you can only get full speed with 3 pin fans unless you have a fan controller, with 4 pin being PWM and therefore able to change speed via BIOS or SpeedFan or whatever software you can use.
Now with a splitter, I doubt two fans will draw too much power and from what I have heard, there is no problem hooking 2 fans, 3 pin or 4 pin, via a Y-splitter, to a motherboard fan header. The header will give and receive signal to one fan, and the second merely operates at the speed of the first without giving signal back to the header. (RPM)
Experts please comment and correct on me.
As for performance increase, it's sometimes next to none, and no more than 5C Degrees. I just switched to push/pull right NOW as an experiment with crappy-ish fans. Temps did drop, and I'm doing my utmost best to sync their speed. (They come with individual fan controllers. Sigh)