When mining Vertcoins I have found it is very important to use the right Catalyst drivers, so please post OS and driver version with your settings.

I have been struggling with my hashrates, but just as an example I have 5x R9 290 (in two different systems) under Windows 7 ultimate 64 bit.

With stock speeds, intensity 17, tc 24550, w 256
Catalyst 14.1 gives around 250 khash/s
Catalyst 13.12 gives ~300 khash/s
Catalyst 13.11 beta 9.5 gives ~400 khash/s

So, if you feel you are stuck and have tried everything - don't forget to try different drivers as well.

Hi! This is posted feedback about trades with me or renting my mining rigs.

My rigs are situated in EU, so please choose pools suitable for this location.