CGminer hashes dropping on second card while both are running

I've got an odd problem. I've got a 5870 and a 5830, I set the 5870 to an intesnity of d so i could dial in the 5830 more easily.

When I finally got it close and fired it up to test I noticed that it dropped by a good 50khash/sec any thoughts as to why?

With 5970@intensity of d
https://i.imgur.com/vyBXfJR.jpg

With both running flat out
https://i.imgur.com/xEuofya.png

Example config (this has a slightly higher oc on the 5830 but the results are similar)

"intensity" : "18,18",
"queue" : "6",
"worksize" : "256,256",
"thread-concurrency" : "8000,6016",
"gpu-engine" : "0-895,0-935",
"gpu-memclock" : "1240,1240",
"shaders" : "1600,1100",
"gpu-threads" : "1",
"temp-cutoff" : "83,83",
"temp-overheat" : "80,80",
"temp-target" : "69,69",
"scrypt" : true,
"gpu-powertune" : "20,20",
"auto-fan" : true,
"auto-gpu" : true,
"failover-only" : true,
"log" : "5",
"temp-hysteresis" : "3",

"kernel-path" : "/usr/local/bin"
}

Topic: CGminer hashes dropping on second card while both are running (Read 366 times)