So i benchmarked my Raspi 3 B+ and an Odroid C2 with sysbench by in single and multithread operation by using
sysbench --test=cpu --cpu-max-prime=20000 --num-threads=4 run
So the Raspi seems to be like 14x slower than the Odroid C2 even though they share almost the same processor under the hood.
RAM shoudn't make the difference here.
Hope somebody got an idea how those results came together.
I installed sysbench via apt-get. OS on Raspi is Raspbian stretch. OS on Odroid is Ubuntu 14.04.