The spec for that HUB says 2.4A per port (12 watts per port)

So with the 36Watt PSU that comes with it, it should be enough to run 2 of them and enough power left for fans provided you dont over-clock them.


Anyway, I found this info a while back that gives a guide to load Vs clock rate for the compac f.


Typically I run mine at 450Mhz, it seems most stable at that rate and averages around 275-320GH/s

Higher clocks and it starts to get very hot and unstable even with forced air cooling. Don't be tempted to overclock too much it'll get too hot.