> How much memory does MorphOS 3.x take to do a clean boot?

Figures told by users of Efika 5200B (128 MiB RAM) amount to about 80 MB free after clean boot, so memory footprint there is about 50 MB. This was with MorphOS 2.4, but I don't think it to be significantly different with MorphOS 3.x.

> if it's >128MB something in definitely wrong :)

The Efika 5200B with 128 MiB RAM is still an officially supported platform with MorphOS 3.x.