Motherboard Fan Headers
Have a couple of questions regarding the fan headers on my Gigabyte GA-MA770-DS3P motherboard. There is a cpu fan header which I am using, no problem there. There is also a fan header for the northbridge. There is a large heatsink on the northbridge and it isn't flat, I have no idea how I would mount a fan on it. Question is, do I need a fan on the northbridge?
Next, there is a 3 pin header for a system fan and a 4 pin header for a system fan. There is also a 3 pin header for a power fan. Question is what is the difference between a system fan and a power fan? My 80mm case fans have 3 pin connectors, not sure I have seen a 4 pin connector for a motherboard header, so how would the 4 pin header be utilized?
Lastly, I read in a thread here that it isn't a good idea to let the motherboard power the case/system fans and I should use the 4 pin molex connectors on my power supply. Is this true? Should I forget about the motherboard fan headers and just use my PSU?
Lot of questions I know, thanks for reading through this and for the advice.
Stark Raving MOD
power fan is just to sense your PSU fan rpm. System fan is a case fan. 4pin would be PWM aka variable speed.
If you use the molex connectors, the fans will be at 100% all of the time. 3/4pin headers on the MB usually give you some control, especially the PWMs.
Mod w/ an attitude
I prefer NOT to use the mobo headers to power my case fans. I use larger fans and they draw more power than most fan headers are designed to handle. I have blown out several headers over the years so I prefer to use the molex power plugs.
You do not need a fan on the northbridge, but you can install one if you want to.
There are fans and heatsink/fan units designed for the northbridge. Your existing heatsink will have to be removed before you can use another cooling device on it. The way I figure, if your northbridge was designed to use a fan it would have one. A fan may cool more, but the heatsink should be sufficient as designed.
Thank God we're not getting all of the government we're paying for!
Thanks for the replies.
Gonna leave the northbridge as it is, the heatsink looks rather robust.
Although I wouldn't mind knowing my PSU fan rpms, it doesn't have a 3 pin connector so I will leave that header alone. I live in a warm climate so I don't mind my fans going at 100%, better to replace fans than computer hardware! So I will use the 4 pin molex connectors for my fans...thanks again for the info.
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