After 3 days of tweaking, I finally have config that run stable on X13 for my 7950.
4 card hashing @1845Mh/s for 18h without any crash.
(The cards are not stable with too hign OC, I was able to run them @1100 core on Scrypt and @1050 on darkcoin ... but X13 is 1025Mh/z max for me if I don't want sick or dead card after somes hours)
Sapphire Dual-X OC 3Go 1025/1250 lightly undervolted @1.125v instead of 1.256v stock
If it help, this is the config
"kernel" : "x13mod",
"api-listen" : true,
"intensity" : "17",
"vectors" : "1",
"worksize" : "256",
"temp-cutoff" : "85",
"temp-overheat" : "75",
"temp-target" : "71",
"auto-fan" : true,
"gpu-fan" : "0-85",
"expiry" : "30",
"gpu-dyninterval" : "7",
"log" : "5",
"retry-pause" : "5",
"scan-time" : "30",
"queue" : "5",
"temp-hysteresis" : "3",
"shares" : "0",
"shaders" : "1792",
"thread-concurrency" : "8192",
"gpu-thread" : "2",
"gpu-engine" : "1025",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-powertune" : "20",
"gpu-memclock" : "1250",
"gpu-vddc" : "1.125",
"failover-only" : true
It seems low my settings with the 7950@1070/1500@1100mV hashing @2300kh/s
"kernel" : "x13mod,x13modold,x13mod,x13mod,x13mod",
"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "10",
"failover-only" : true,
"kernel-path" : "/usr/local/bin",
"log" : "5",
"queue" : "1",
"scan-time" : "7",
"shares" : "0",
"failover-switch-delay" : "10",
"gpu-threads" : "2,4,2,2,2",
"gpu-dyninterval" : "7",
"gpu-engine" : "0",
"gpu-fan" : "65",
"gpu-platform" : "0",
"gpu-memclock" : "0",
"gpu-memdiff" : "0",
"gpu-powertune" : "8",
"gpu-vddc" : "0",
"intensity" : "19,18,19,19,19",
"temp-target" : "75",
"temp-overheat" : "85",
"temp-cutoff" : "95",
"temp-hysteresis" : "3",
"vectors" : "1",
"worksize" : "256,64,256,256,256",
"lookup-gap" : "0",
"shaders" : "1792,1536,1792,1792,1792",
"thread-concurrency" : "8192,8000,8192,8192,8192",
"no-pool-disable" : true,
"device" : "0,1,2,3,4"
second setting is for my 6970
sgminer 4.1.0 - Started: [2014-06-05 18:01:24] - [0 days 06:39:08]
--------------------------------------------------------------------------------
(5s):10.54M (avg):10.49Mh/s | A:1701 R:34 HW:0 WU:0.148/m
ST: 1 SS: 0 NB: 695 LW: 61250 GF: 0 RF: 0
Connected to miningrentalrigs x13 (stratum) diff 0.041 as user xxxxxx
Block: 1fd4f716... Diff:1.81K Started: [00:40:17] Best share: 114
--------------------------------------------------------------------------------
[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 57.0C 2730RPM | 2.306M/2.303Mh/s | A:404 R: 1.6% HW:0 WU:0.032/m I:19
GPU 1: 44.0C 65% | 1.444M/1.445Mh/s | A:193 R: 1.3% HW:0 WU:0.018/m I:18
GPU 2: 61.0C 2806RPM | 2.294M/2.295Mh/s | A:377 R: 1.9% HW:0 WU:0.034/m I:19
GPU 3: 56.0C 3068RPM | 2.296M/2.302Mh/s | A:368 R: 1.4% HW:0 WU:0.032/m I:19
GPU 4: 56.0C 2683RPM | 2.293M/2.302Mh/s | A:359 R: 1.2% HW:0 WU:0.032/m I:19
--------------------------------------------------------------------------------
[00:35:17] Accepted 059f93b4 Diff 0.178/0.084 GPU 2 at miningrentalrigs x13
[00:36:09] Network diff set to 1.92K
[00:36:09] Stratum from miningrentalrigs x13 detected new block
[00:38:14] Accepted d642df5e Diff 1.195/0.084 GPU 2 at miningrentalrigs x13