The PCS+ is supposed to have 4-phase gpu power section. Not sure if the other brands do.
I know that the regular Powercolor 1gb model uses std 3-phase.
The 4-phase power does means that other manufacturers bios files do not work with the PCS+....I verified this on my 512mb PCS+.
Also, i don't think that reference full cover waterblocks work due to the different power regulation....although i would prefer to be corrected on this issue ;)