Thanks to you both for all the useful information, only recently got back into GPU mining and I seem to have forgotten everything I used to know and lots of things are new
Fired up my old 7950's that had been gathering dust and I got some new MSI RX580 Gaming X 8Gb cards and they come with Samsung Memory.
All I have done so far is copy the 1:1750 strap to the 1:2000 strap, currently using -cclock 1135 -cvddc 975 -mclock 2150 and getting much better results than stock of around 30MH and 100w per card ETH mining only, the problem I am having is when I try to dual mine with decred. My numbers go to pot, the ETH mining speed drops significantly to around 28MH even when the DCR speeds are much lower than yours around 600.
Could either of you share your claymore command lines to see if I am doing anything obviously wrong.
Also that doreymills site that was linked earlier, my original 1:1750 strap is
777000000000000022CC1C00106A6D4DD0571016B90D060C006AE70014051420FA8900A0030000001B11333DC0303A17
777000000000000022CC1C00106A5D4DD0571016B90D060C0060070014051420FA8900A0030000001011333DC0303A17
Do I copy the new one to both the 1:1750 and 1:2000 or just one of them, or do I do the 1:1750 then use the tool on the 1:2000 and get a new value for that too ?
TIA