Is this an upgrade? Also is it MoBo compatible?

one would be fine, in theory u have 2 pci 16x slots, im unshur about crossfire support and how it works, but u do have 2 slots avaible, id ask a second opinion,

also whats ur power supply because u should make shur u have enought juice to power a crossfire 7950 setup :)

will await ur reply thanks.

 
you will see a night and day improvement in game performance...the question is can your current power supply support the top dog amd card power wise

im using 7970 on the same mobo...pcie 3.0 is backwards compatible so it will work