Worth waiting for Kaveri?

[nenforcer]

Tests show that frame pacing on regular Crossfire is much better with Hawaii (290/290X) because of the xDMA engine replacing the bridge connector.

Does anyone know if this would require a PCI-E 3.0 compatible motherboard / cpu or is it backwards compatible to all of those older PCI-E 2.0 motherboads that are out there?

This is a GCN 1.1 feature, so it would also be included on Bonaire (7790/260X), but not on most of the rest of AMD's lineup. I wonder if Kaveri will be able to use xDMA to improve the quality of Hybrid Crossfire with these cards.

Kaveri is going to have the integrated PCI-E 3.0 controller on the chip itself so it should have the maximum current possible bandwidth when interfacing a discrete GPU with the onboard APU using system DDR3 memory. I can't imagine the quality won't be improved.