I think yes if that's per GPU, since 7990s has dual GPUs. Here mine are doing 3.08MH/s per GPU, a total of 6.5MH/s average.
Thats the conf:
{"intensity" : "18,18,18,18",
"worksize" : "256,256,256,256",
"kernel" : "x11mod,x11mod,x11mod,x11mod",
"lookup-gap" : "2,2,2,2",
"thread-concurrency" ...