I still need some help, please. I set all my GPUs on one worker. It doesn´t help. I still have a lot of invalids. I´m mining on the EU pool. Are there some problems with the server?
At the moment:
10 Minute Hash Rate 5907 Kh/s
Valid Round Shares 13056
Invalid Round Shares 9024
Your Efficiency 59.13%
Edit: I even tried dif. of 16 and 32. It´s worse. Between 64 and 256 is no difference.
Can you combine workers by using fewer instances of your miner?
Also watching the output from your miner should help give you a clue where things are going wrong. The only time I see rejects is when the pool changes blocks, and it's rare, certainly not always.
M