530 khash/s is a normal value for a stock 7950
Well it's not stock, it's overclocked and overvolted!
Ok I just tried oc'ing to 1100clock/1500mem + powertune upped to 20 and only gained approx 40kh/s to a whopping 570kh/s average..
Maybe a faulty card?
No, you are just flogging it expecting huge numbers. Scrypt is not sha, it takes a delicate touch with tuning. 5mhz too much on memory or core can absolutely tank a good hashrate. It's all about finding the golden ratio. You are going about finding it wrong.
First, forget any and all overclock entirely. forget power tune, anything. Get the card running at it's absolute best, then start to overclock.
The PC is going to be unresponsive when mining at 100%. Sorry, but it's the nature of the beast. If you want the best hashrate you've got to deal with it.
8192 is also not a TC a 7950 should EVER run. I don't know how I can explain it any clearer, but the TC should be a multiple of the shader cores your GPU has. Shaders are irrelevant, except for finding the right TC.
8192 is 2048x4. 2048 shaders is a 7970, but you don't have a 7970. You have a 7950, so you should use 7168 or 7169 if g=2.
Pontiac I'm following people's suggestions, nothing more.
Believe me I tried dozens of settings with abysmail results. The only thing that boosted Khs is the powertune setting.
I got 8192 from posted settings by users, it seems lots of people are running that on 7950s. But I did try 7168 following your advice and khs was basically the same but a little lower.
So what do you suggest I should do next? I tried intensity settings from 13 to 14 to 16 to 17 to 19 and they improve things just slightly, 19 results in a 30khs increase only.
You say forget oc and powertune but what else should I tinker before that?
The latest try on oc values was from a guy with the same card as mine running the exact same settings but with 630 khs,so I gave it a shot, but to no avail.
Thanks in advance,
Nick.