Hi, I´m from Germany. I work with fractals in the past with my Amiga 2000.
That was 1990 and the CPU runs with 7,14 Mhz. A good training of patience.
I´m very happy to found this forum and I will start again with Mandelbulb3D.
Greetings, and Welcome to this particular Forum !!!

Mandelbulb3D is definitely a good program to start off with. Just remember it is still fairly new and being developed, but has great potential.
May some can answer me a questions.
Is there any diffrent in speed between an AMD or Intel CPU when thy have the same GHz?
Yes, there are differences, but they might be very slight or much more. It all depends on several other factors. Even two supposedly identical machines off of the assembly line might have differences in speed.