You stole the words right out of my mouth. I have the exact same card, the Gigabyte HD7970 OC 3GB. I found the same problem. I had to play around for an hour before I stumbled upon these same settings. except I didn't use export display=:0 or GPU_use_sync_objects=0. I used the Gigabyte OC Guru program because I couldn't get MSI afterburner working properly. Did I mention I am using catalyst 13.3 beta drivers?
Hope this helps.
PS. If I run this hotter than 83 C it craps out completely.
I have pretty nice 732Kh/s mining litecoins with 7970.
Below there are my specs and configs.
It is very important that you need to hit the "sweet" spot of Core MhZ and also Memory Mhz.
For me is 1045/1500
If i will change 1500 memory to even 1501, speed goes to about 550KH/s
(Please donate anything if i helped ANYBODY
Ubuntu
Catalyst 13.3 Beta 3
Gigabyte Radeon HD7970 OC 3GB DDR5 384bit (1000/5500) (GV-R797OC-3GD)
GPU 0: 79.0C 3195RPM | 731.7K/732.4Kh/s | A:4134 R:32 HW:0 U: 2.66/m I:13
#!/bin/bash
cd ~/cgminer
export DISPLAY=:0
export GPU_MAX_ALLOC_PRECENT=100
export GPU_USE_SYNC_OBJECTS=0
aticonfig --od-enable
./cgminer --scrypt \
-o ltcmine.ru:3333 -u XXXXXXXXX -p XXXXXXXXX \
-I 13 -w 256 -g 2 --shaders 2048 --thread-concurrency 8192 \
--gpu-engine 1045 --gpu-memclock 1500 --auto-fan --temp-target 75 --temp-overheat 80 --temp-cutoff 85
BTC: 14umHTZJ1dwjts4r5uEdzkFyjrgLEL5TzS
LTC: LZ1APfJWesDugPz1xvgbE8KvU8XT7oTvya
PPC: PWQzdvdg5JubY84JXEPPRtXrsagnSyQ8hW
TRC: 1JZHVDFYjyQtbVaVYq9PG6iabK7iu4WUEQ
NVC: 4H9TCyNMAWfNiKrvEw9evMU63sBVwEj9NM
BTE: 8GFofiaH5rQGi8HhGxP3o7XqKmKiUpMVxm
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