cgminer overclocking

[cheese_bot]

I'm using cgminer with one 7950, and lately I have been trying play with clock speeds. Every time I change the mem-clock, the hashrate will go up slightly (about 15Kh/s), and then drop back down to where it was (275Kh/s). According to GPU-Z, the speed is staying where I set it, so why is the hashrate going back down???

I am making the changes from the GPU menu of cgminer while it is running.

[frojoe]

I have noticed that you cant change clocks ont he fly with like MSI afterburner. like you can with BTC mining. You need to stop and start the miner to get the new hash rate. Plus you should have higher hash that 300ish with a 7950.

[cheese_bot]

Thanks dude. That's probably it, although the example in the read me doesn't mention the need to restart.

Hashrate of 275 is with intensity:13. With I:20 i get ~550

I appreciate the help friend

[Nutnut]

You don't need to restart when making the changes from the interface - only if you're changing the batch file etc.

To prove this, drop your gpu clock to something very low and watch what happens.

I only ever tweak my miners via the menus then, once i find the sweet spot, i lock it in with the batch file.

Doesn't answer your question as to why it drops though. Do you have --auto-gpu/fan/mem/temp set in the config?

[cheese_bot]

You don't need to restart when making the changes from the interface - only if you're changing the batch file etc.

To prove this, drop your gpu clock to something very low and watch what happens.

I only ever tweak my miners via the menus then, once i find the sweet spot, i lock it in with the batch file.

Doesn't answer your question as to why it drops though. Do you have --auto-gpu/fan/mem/temp set in the config?

auto-fan is on. auto-gpu is not. I set target-temp etc, but (according to the readme) this shouldn't effect the clock speed because auto-gpu is not on.