Never really thought of that. It should still use the the GDDR5 on the card. Most of the GPUs they suggested for hybrid crossfire for Llano had DDR3 though. I haven't seen an official support list yet for Trinity. If I were you I would still get the GDDR5 version of the 6670 because you're better safe than sorry. Also I might wait til AMD releases an official list of supported hybrid crossfires.