The first custom bios, that one with CPC On (1T) is not only fast, but stable (my PC has been running almost 24 hours, without any stability issues).
IMHO it could remain as it is - I mean that beta should be final!
Some results later, probably this night.
@toonces311 :
I can't use the Alt+F2 method, cause that bulit in flash program says, that this bios is not for my mobo - the same situation was with non-modified Epox bioses. These are all for 8RDA6+ PRO and although they are also for 3+ PRO, they won't flash without "IQ" parameter (at least in my case).