Dual HD 7950 problem

[CR7xMarcelo]

I have with two sapphire's HD 7950's...
My pc randomly shuts down and my asus mobo tells me it detected power surges.
At first i thought it was a faulty psu but now i changed it for a 850Watt gold corsair psu and the problem still occurs.
Two cards bricked because of this random shutdown happening to often and luckily i could change them with warranty.

This is my cgminer settings when im using the pc:

,
"intensity" : "12,18",
"vectors" : "1,1",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,2",
"thread-concurrency" : "16384,16384",
"shaders" : "0,0",
"gpu-fan" : "35-85,35-85",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "20,20",
"gpu-vddc" : "0.000,0.000",
"temp-cutoff" : "90,90",
"temp-overheat" : "80,80",
"temp-target" : "65,65",
"api-mcast-port" : "4028",
"api-port" : "4028",
"auto-fan" : true,
"expiry" : "120",
"failover-only" : true,
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

[CR7xMarcelo]

Bump i still have the issue..
Last setting: i 17,17 engine 1020,1020 
Got 2x 600khash but surge detected by mobo after couple of hours

[stacksmasher]

Take out most of that stuff...

Lookup Gap ---- take it out

hotplug....

If you are having issues take out the "thread concurrency" until you get it stable

[CR7xMarcelo]

Those settings are alwayse there when i save a config file? (lookup gap i put there myself)