As MasterC says; mem=nopentium did the trick
for me, but only for stability and Nvidia in my case,
i could easily install it though
I ran into another install problem, but that was
freebsd related; only thing that worked then was;
flashing the bios! yes a bit risky, but the only option.
Maybe the not installing mdk/rh thing is related with
AMD runs otherwise just fine with linux