3 x sapphire 7950 low speed or freezing

[how-high]

hi
I have running 3 x sapphire 7950
I tried many configs
I can get it on around 600kh/s but then allways freezes
the fastest a littlebit stable I get it is this

http://s27.postimg.org/f198dv9oz/Untitled.jpg

I currently use this config

]
,
"intensity" : "13,13,13",
"vectors" : "1,1,1",
"worksize" : "256,256,256",
"kernel" : "scrypt,scrypt,scrypt",
"lookup-gap" : "0,0,0",
"thread-concurrency" : "14336,14336,14336",
"shaders" : "0,0,0",
"gpu-engine" : "1020,1020,1020",
"gpu-fan" : "0-65,0-65,0-65",
"gpu-memclock" : "1550,1550,1550",
"gpu-memdiff" : "0,0,0",
"gpu-powertune" : "0,0,0",
"gpu-vddc" : "0.000,0.000,0.000",
"temp-cutoff" : "95,95,95",
"temp-overheat" : "85,85,85",
"temp-target" : "75,75,75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"failover-only" : true,
"kernel-path" : "/usr/local/bin"
}

also 2 cards are way slower?
any ideas?

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[how-high]

no one?

[MakuSoto]

no one?

You are better with 1thread and tc of 40960 is whati use. I get 630 at 1050, 1250 with sgminer At 1.12vddc.

[Wipeout2097]

Maybe because either "gpu-memclock" is too high or the VRMs are at absurd temperatures.

Use gpu-z "sensors" to check the latter, while mining.

"intensity" : "19",
"lookup-gap" : "2",
"thread-concurrency" : "21712",
"gpu-threads" : "1",
"gpu-engine" : "1000",
"gpu-fan" : "60-90",
"gpu-memclock" : "1500",
"temp-cutoff" : "80",
"temp-overheat" : "75",
"temp-target" : "68",

[atp1916]

OP, You do not need to triple up on the parameters if you are running the same config for all 3 cards. If you have not already, define GPU_MAX_ALLOC_PERCENT as 100 in your environmental variables either through System properties or the setx command at the cmd prompt.

Note the difference in Wipeout's config vs the one you are currently running: Vectors is not needed for scrypt mining, -g = 1, -i = 19, and the -thread-concurrency = 21712.  

[how-high]

changed it and currently testing like this

"intensity" : "19",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "21712",
"shaders" : "0",
"gpu-engine" : "1000",
"gpu-fan" : "0-65",
"gpu-memclock" : "1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "0",
"gpu-vddc" : "0.000",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"failover-only" : true,
"kernel-path" : "/usr/local/bin"

[atp1916]

Looking good, but change your --gpu-powertune to "20". 

[how-high]

ok changed powertune to 20

howverb I see directly already all cards still have different hashrate?

could 1 reason be because on 1 card I have the monitor connected?

is it possible to use the onboard vga for the monitor? and the cards only for mining?
I tried, but cgminer didn't see my cards anymore then?

[how-high]

here the current state
to gpu 0 I have the monitor connected, would it be because of this so much lower?
and why is there such a big difference between gpu1 and gpu2?
http://s8.postimg.org/vbx9ncfkl/Untitled.png

[atp1916]

I would dare say you may have a driver issue due to that type of spread in hashrates.  Which driver set are you using and what OS?  

Personally, i've had excellent success with the 13.4s + 2.9 SDK for all my 7950s in Win7/Win8.

If you do try that combo out, make sure you uninstall your old set using Display Driver Uninstaller in Safe Mode first.

[how-high]

hi
windows 7 74bit
I just used the driver cd that came with it
where I can see what version it is?

and where I can download this 13.4s + 2.9 SDK ?

I found this one which I am downloading now
AMD-APP-SDK-v2.9-Windows-64.exe
is this the correct one?

however I cannot find 13.4s?

[how-high]

uninstalled in safe mode all drivers with Display Driver Uninstaller
installed 13.4 + 2.9 SDK (windows 7 64bit)

using this config

"intensity" : "19",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "21712",
"shaders" : "0",
"gpu-engine" : "1000",
"gpu-fan" : "0-65",
"gpu-memclock" : "1500",
"gpu-memdiff" : "0",
"gpu-powertune" : "20",
"gpu-vddc" : "0.000",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "75",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"failover-only" : true,
"kernel-path" : "/usr/local/bin"

and after 5 mins freezes whole system?

[how-high]

and still big difference in hashrate?
http://s13.postimg.org/5z6odycav/Untitled.png