will a 7970 power this for casual gaming?
Depends on the game, but I can play BF3 pretty nicely at ultra quality w/ AA turned down
and I only have a 7950 (although it's MSI's awesome TF3 version).
Mobile: Samsung Galaxy Note II Exynos Quad 4412 | 5.5" 720p AMOLED | 2GB RAM | 16GB ROM | Jellybean 4.1.2
Desktop: BitFenix Colossus MSI Z68A-GD80 | Intel i5-2500k | MSI TF III 7950 | Vengeance 16GB | Seasonic X750