Originally Posted by StringerBell
edit- i've done a little more research, and came to the conclusion that i'll just run all 4 off my psu. i dont mind the noise associated with 4 fans running full blast all the time
This is probably the best option. If the PSU is stable enough then you should not have a problem with the fans. You can always look for quieter fans in the future if you feel the need to do so.
The only real advantage to connecting to the mobo is that you can then get fan speed readings and you can vary the speed. Most (if not all) BIOS these days, mobo supplied software as well as aftermarket software allows for this but they all need to be connected to the mobo. Through the PSU you would then require a fan controller which IMO is a bit more convenient since you can adjust on the go. Unless, of course, you have mobo mfr supplied or aftermarket software and even then a controller is way easier and practical.