just did a test with packet: https://app.packet.net/portal
They offer 96cores of AMDv8 machines for 0.50$ / hour, was quite easy to setup an ubuntu, prepare for development.
compilation took less than a minute! --> make -j 93
rendering performance is quite descent but not comparable to intel CPU
In the image:
upper part: running of mandelbulber in cli mode for the flight animation
lower part: the output of htop (not showing all cores, since screen too small)