I built a new pc last night and have a question. The MB (MSI 915P) has a system fan and power fan hookup on the board. Right now i have the 2 case fans running right off the PS. If im not mistaken the MB hookups are smart fan controllers, i like as quiet a pc as possible. Do both of these hookups function the same or do i need to splice them and run them off one? By the way here are the specs. Antec Case w/425w PS MSI 915P MB 3.2 P4 800mhz FSB 2x512mb Kingston Ram Leadtek 6600GT PCI-E WD 120gb SATA DVD/CD-RW Onboard 7.1 sound Optical MS mouse and Cheap KB WinXP home New 21" flat crt <--So sweet. She ran an 8200 in 3dmark 2003 (no tweaking or driver updates yet)
12th March 2004
the system fan hookup is for your case fans and you should also have one for the cpu fan
Thinking about it.
Shizzle my nizzle
28th July 2004
You should consider getting a few 3-pin Fans as the 4-pin ones are using a coxial from your power supply and if you want performance you will probably run out of PS cables after you will your PCI slots.
My 2 case fans are 3 pin fans as are the connectors on the MB. So does this mean these fans will be controlled as the MB sees fit? Do both connectors do essentially the same thing (provide power)?
The blue wire on the 3-pin molex allows the motherboard to monitor fan speed. It will then--if configured to do so--adjust the voltage going to the fan up or down based on the temperatures of various thermal diodes. I personally don't use them, except for my chipset cooler and to monitor the RPM of my CPU fan.
The standard 4-pin molex works just fine, but you won't be able to monitor fan RPM unless it has a dedicated monitor wire.