what 20 port hub?  I ask because I own this 20 port hub


http://www.ebay.com/itm/90W-power-20-port-USB2-0-HUB-USB-HUB-Industrial-grade-HUB-for-Bitcoin-mining-/261376179469?pt=US_USB_Cables_Hubs_Adapters&hash=item3cdb3bfd0d


and I own this 19 port hub

http://www.ebay.com/itm/Silver-Industrial-19-port-500mA-Dipo-Aluminium-casing-USB-Hub-20-Amps-220vV-5V-/111256399302?pt=US_USB_Cables_Hubs_Adapters&hash=item19e765edc6


so since I have some to compare to I would like details on your hub