Ok it is what it is, I was looking into your pcb and it doesn't seem in the same league as a gig 970 or a msi, I could be wrong but it looked like a reference pcb with a funky cooler with the fans underneath the heatsink.
Still you'll only be 3-4fps down on a 1600 mhz 970. I came from a 1175 7950 too and likewise the 970 is just a stopgap until next year.
ahh well.. one of these things.. as I say its a big jump from the 7950 and for what it's cost me I cant argue.
I had planned on an upgrade next year once the new cards come out.