2x 7970's are running, but with much lower Kh/s than I anticipated (1100 Kh/s). I found out the GHz edition 7970s aren't all that great at mining unfortunately. The upside is they run a lot cooler than these other 7970's I'm seeing, with the one that has the most constricted airflow (fans almost bump against other 7970) running at 73C and the other with better airflow at 64C. I don't have enough data to say how many Litecoins I am getting per day, but a rough average would be 0.1 LTC every 45 or so minutes, a lot more than I expected, really.
I've tried overclock and intensity figures, overclocking them seems to actually make them worse and modifying intensity above or below 13 also makes them worse. The GHz edition apparently doesn't respond to clock and configuration changes as well as the stock 7970 does.