FYI, I got 5 of the SiPolar-esques in recently. I still have to try it, but all 20 ports at least boot up fine on my model (haven't plugged it into a PC quite yet).
Proof:

test it out im dying to find out!!!
theres 2 methods of running these, icarus with 3.1.1 or the new usb drivers for 3.2.0+ maybe that has an effect?