What is the capacity of a GPu's fan header?

[crystal3d]

Hi,

TL;DR
How many fans can i connect to a GPU header?


I have a reference design gtx 680 and i have mounted a AIO cooler kit onto it.(arctic hybrid II 120)




So basically, i want to hook up this fan of arctic's cooling kit:

and this:

onto this GPU fan header

VIA this:

But can the Fan controller afford to power two instead of one? how about three?

 

[volcanoscout]

Most mobo fan headers top out at 1A and about 15W. Power-wise as long as you stay under that, you should be okay, but it's not ideal. If you split the PWM signal too far, your fans won't get a strong enough signal and they'll revert to their 12V max RPM. If the fans are all PWM, your best bet is to get something like an Akasa 3-way or 5-way PWM splitter that draws power straight from the PSU, but is controlled by PWM via the CPU header.