What are people getting with undervolted/underclocked cards?

I'm running 2 R9 280x cards down at almost 1.00v and 930/1220 @ 18intensity. They're getting about 2.8Mh/s, is that terrible or ok if they're running 930/1220? Running them low to save on power/heat, and its hott as balls in my place right now.

"intensity" : "13",
"worksize" : "400",
"kernel" : "x11mod",
"lookup-gap" : "2",
"thread-concurrency" : "8192",
"shaders" : "0",
"gpu-threads" : "2",
"gpu-engine" : "930",
"gpu-memclock" : "1220",