Fan Header on MOBO

Does anyone have any idea what the safe/relative max draw of voltage is normal for a fan header on a mobo? Im looking to combine 4 fans into one 3-pin molex
to run onto the fan header and wanted an idea if this will work due to voltage limitations on the mobo. mobo in sig. Fans are Cougar turbine

http://www.newegg.com/Product/Product.aspx?Item=N82E16835553009

I have them on my 240 rad in a push/pull config.

any links or info is appreciated

12W/1A is my guess... it may handle more, not sure I would do it though...

on my mobo i have a cpu_fan header and a cpu_opt header next to each other. ED do you think if i went 2 and 2 i would be able to control all 4 together? does the voltage look better with 2 on each header?

You can easily run two of those fans off of one header. They only pull 2.4W each in a worst-case scenario.