Problem with 2 x 7850s on same motherboard

Hi, hoping someone can help a newbie with a little problem:

I've got 2 x Gigabyte 7850 's connected to an Asrock Extreme3 motherboard and I'm using cgminer.

One of the GPUs is working fine at over 300k/hs but the other one only gives around 45k/hs.

After a bit of googling and reading through a few threads on here, I was thinking I need to change the cgminer config file. But even after reading the readme files I'm not sure what I should be changing or even if it's the config at all.

Any help or advice would be much appreciated. And apologies in advance if I'm just being stupid and missing something obvious

Config:

Quote

{
"pools" : [
   {
      "url" : "http://url1:8332",
      "user" : "user1",
      "pass" : "pass1"
   },
   {
      "url" : "http://url2:8344",
      "user" : "user2",
      "pass" : "pass2"
   },
   {
      "url" : "http://url3:8332",
      "user" : "user3",
      "pass" : "pass3"
   }
],

"intensity" : "d,9,9,9",
"gpu-engine" : "0-985,0-950,0-960,0-1000",
"gpu-fan" : "0-85,0-85,0-85,0-85",
"gpu-memclock" : "860,825,835,875",
"gpu-powertune" : "20,20,20,20",
"temp-cutoff" : "95,95,95,95",
"temp-overheat" : "85,85,85,85",
"temp-target" : "75,75,75,75",

"auto-fan" : true,
"auto-gpu" : true,
"expiry" : "120",
"failover-only" : true,
"gpu-threads" : "2",
"log" : "5",
"queue" : "1",
"scan-time" : "60",
"temp-hysteresis" : "3",

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

I've got cgminer pointed at:

Quote

cgminer.exe -o stratum+tcp://stratum.bitcoin.cz:3333 -u ### -p ### -I 12

cgminer:

http://s20.postimg.org/rf3zvucqh/cgminer.jpg