OK thanx kmathern and others,
then I leave and choose an other distro, until wielding this HW.
The latest LTS Mint 13 xfce recommends 2 ati drivers after boot, and one seem to work well - at least, if I do not upgrade / update too many other programs.
-- Spectre and Meltdown vulnerabilities
-- Change in MX sources
-- MX Linux on social media: here
-- Mepis support still here
-- MX-17.1 Final release info here
-- antiX-17 release info here
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For help or questions about 64-bit version of MEPIS, this is the forum to use.