Do any mining sofware work with 18-24 GPU's?
Thinking about this one

http://www.ebay.com/itm/PCI-E-Slot-Expansion-Kit-1-to-4-Ports-Switch-Multiplier-Hub-Riser-Card-USB-CAAU-/172783675614?hash=item283ab5a8de:g:n48AAOSwJdZZbJEe

and this one

http://www.ebay.com/itm/1-Port-PCI-E-1X-To-3-Slot-1X-Switch-Multiplier-Expander-HUB-Expansion-Riser-Card-/232355046854?epid=929725712&hash=item361970a5c6:g:vCwAAOSwIaFZLnlx