Thanks for your thoughts on this - my media centre has 2 GB RAM, 512 GB of which is dedicated to the graphics card; I have done this through BIOS, as per your suggestion. Whether this value is referring to the onboard graphics (which I'm not using), or my graphics card, I don't know.
However, you've spoken of a setup under advanced setup or advanced chipsets - could you elaborate on this please? Would I access this through the KDE desktop?
Cheers,
MM.