Quote from: NewbieMiner17 on December 14, 2017, 10:48:26 PM

Quote from: BSAlex on December 14, 2017, 07:01:05 PM

Quote from: NewbieMiner17 on December 14, 2017, 04:46:07 PM

Hey guys,
me again!

So. I'm still running 6x RX480 4gb saph nitro+. Blockchain drivers, Memshift Anorak Bios, OC with AB.

So out of two rigs with exactly the same setup I've recently been mining on nicehash with around 28MH per card. On Nanopool dual mining ETH/SC I've been getting around 25MH. After the whole nicehash hack I've had to go back to nanopool until they get the systems back up and running.

Thats all fine and one rig is running golden. My other rig however has now decided that it will not mine at anything higher than 19MH with the same settings. I've tried reinstalling the drivers, reupdating the Bios, playing with OC, went back to V10 claymore, etc but no luck the cards are just refusing to run at over 19MH. Does anyone have any idea what could be causing this? I think I'm going to switch the hard drives around tonight to see if that does anything but short of that I'm stumped. Guess it would mean a fresh windows install if it does solve it.

PS. when I tried powersave bios on half the cards it did drop it even further to 16MH. previously on powersave I was getting around 22.

Looking forward to hearing what ideas you guys might have.

Please check what EPOCH is used in both cases. I have a miner that use different EPOCH randomly, and mining speed is completely different: from 9.5Mh to 23Mh (!!!). Did not find any possibility to control what EPOCH is used so in my case the problem is unresolved :-(

Thanks but dont think this is it. With the blockchain drivers we should avoid epoch issues. Have you updated to blockchain driver?

UPDATE: So I swapped the hard drives around the rigs and now the other rig is running with 19MH instead... I'm pretty sure all my settings are exactly the same... Is there something windows could have changed after a few too many crashes?

Epoch changes affected DAG size which caused us to see performance drops. This was because of the way AMD drivers address graphics memory, it did not affect performance in games etc, but crippled Ethash mining. With the blockchain drivers AMD fixed this.
In newer drives, you have to go to AMD settings - gaming - global settings and switch to compute mode from the default gaming mode. This fixes hashing performance.