I'm currently mining with a single 7950 and getting 280kH/s or so but the pool is only showing 30 kH/s??
Without more info, there's not much anybody can do except recommend some settings. How long have you been mining on the pool at that speed? Are you getting hardware errors? What's your accepted:rejected ratio?
I have two 7950 cards running @ ~ 343 Kh/s each. My settings can be found here:
https://bitcointalk.org/index.php?topic=469887.msg5597962#msg5597962