I was just wondering if there is a solution to put this Graphics external on a computer.....
No there isn't. Especially not USB. 
Well, there is a solution: http://www.magma.com/expressbox-16-basic which can expand your PCIe Port to 16 Ports in an external case, but I doubt anyone would pay that much... Even the box for two cards is very expensive: http://www.magma.com/expressbox-2-1u