Quote Tony from Xtreme Systems (works for OCZ)

I just spoke with David, main man at hexus and he confirmed 6.6 is "supposed to be" the one that unlocks dongle less Xfire but with an extra twist...RD580 is the chipset it works on.

So manta, cfx3200 etc users report in and give us the lowdown on if it works or not

I will try and have a play tomorrow if i can with my 1800XT's
In the meantime all of us with 8x2 PCI-E mobos are still screwed. Least I found a cheap X1900 Xfire card on ebay.