which hardware should i have to find 1 block per hour for example ?
I use a Z620 workstation with two Xeon CPUs (2x 8 Core 2,2 GHZ). I get more as one block per hour.
how to know hashing speed ?
I can't see the hashing speed, i use only the integrated Miner.
what OS do you use ?
i make by instruction from post #16 for windows using external miner without any statistic and there are no blocks for 2 hour
built-in miner with command "generate 1" gives the same result
That isn't a external miner, that is just a bat script.

You can use the normal qt version for mining. I use Windows 10 for the workstation.