Gigabyte 7970 advice

[mx19]

Hey guys,

a couple of us have been mining altcoins for a while now and i have been messing around with settings but cannot seem to get over 680kh/s per card!!

Info on the rig:

4x gigabyte 7970 GV-R797OC-3GD rev2.1

8gb Ram

Processor   AMD FX(tm)-4100 Quad-Core Processor, 3612 Mhz, 2 Core(s), 4 Logical Processor(s)

Motherboard

Running windows 7 64bit.

I am running cgminer 3.7.2 with the following .bat file (after trying various combinations, this seems to give the highest hashrate):

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
timeout /t 180
C:\Users\Miner\Downloads\cgminer-3.7.2-windows\cgminer-3.7.2-windows\cgminer.exe --scrypt --url stratum+tcp://eac.us1.hackshard.com:3333 -u x -p x --intensity 13 --gpu-engine 955,955,971,971 --gpu-memclock 1500 --thread-concurrency 8192 --auto-fan --worksize 256 -g 2 -v 1 --lookup-gap 2


Can anybody see something i am missing that is denying me the 700+kh/s that people seem to be getting?

Any help is greatly appreciated!!!

Thanks

[Gamer67]

Your core clocks are too low and mem clock could go higher too.

Core should be 1050 and up. Clock your mem as high as it will go stable.

I use 1130/1750 and it nets me 788 on two cards.

[mx19]

Thanks for your reply...

What cards do you use?

I will try changing the clocks again but if i go any higher on core clock at the moment then hashrate quickly drops! any thoughts as to why?

Your voltage is slightly different aswell, i am hesitant to change this but is it something you have done?

cheers

[mx19]

So i just tried again with the clocks, i got to 1600 before it crashed so restarted with 1575mem, then i only got to 825core before it went unstable... i just cannot seem to get anywhere near the clocks people are recommending...

With 1500 mem I go up in increments of 5 until the hashrate crashes then decrease by 1 until it is at its optimal which are the clocks i posted earlier...