The Grid probably will struggle to handle the fans, unless they only use about ~1.3W each. There simply is too much current with high speed fans. That said, there are power efficient fans (like the Gentle Typhoon).
Another option for you is to consider getting a higher current controller (Ex: Lamptron makes some that go up to 300W or more).
If you don't need exact fan control, then you could get a Lamptron Hummer:http://www.newegg.com/Product/Product.aspx?Item=N82E16811997014&cm_re=lamptron-_-11-997-014-_-Product
It's not too expensive and does 100W/channel with 5 channels. More than enough.
Originally Posted by Sorphius
Thats my problem, is that the fans I'm planning to use don't come in a PWM variety. If they did I'd just get a bunch of the 5-way MOLEX splitters and go to town. Does anybody know of a splitter or hub that would let me control 3-pin fans similarly"
Would connecting regular fans to a PWM hub/controller combo allow me to control RPM? I don't need the full spectrum of speeds... My cooling is so overkill that I don't think I'll ever need to crank them over 50% or so to get the delta I'm after.
Even with 22x PWM fans, PWM signal would only last up to about 8-16 fans because the PWM signal wouldn't be strong enough to hit the fan. You would need 2-3 PWMs.
Such a product does exist:http://phanteks.com/PH-PWHUB.html
Yes you could use the PWM fan controller made by Phanteks, as it converts PWM signal to voltage control, although you may need up to 2-3 again because of the current draw. It would not give super exact control though (set to 0% for slow speed and anything above 0% gives a very dramatic increase in speed), so it doesn't give the kind of super exact control you are looking for, but it does give some control.
Some reading material:http://www.overclock.net/t/1515073/phanteks-pwm-controller-results-with-gentle-typhoon-ap15/0_100