Hi,
Can anyone tell me which one is better (so high or so low possible ) in Benchs. sry I am new in this.

Hashrate (so high possible)
Intensity (high 19 between 21)
Freq MHZ ? If freq is lower than 2000 and it says mem 4000 is it overdo. is it possible to do -2000 in overclock to save watt?
Watts (low possible)
Efficiency ?
Thank you

You're going to have to do your own testing, but I wouldn't do -2000 on anything.
Depending on the video card, gpu mhz between 1600-2000 is pretty normal, as is memory speeds in the 4000 range.
Usually you don't use negative numbers on the mhz numbers. Some people will decrease voltage to try to save on power, but I'd recommend reading more on it before you do it.