NeverBackDown
AMD Enthusiast
Kinda why I only mentioned the 290(x). Either way, apparently the fingers are OK for 1080p, not perfect though.
Ya I was elaborating on it

The fingers can transfer the data fast enough, it's just more efficient to do it through the bus as there is much more headroom there with PCIe 3.0 and I'd guess lower latency playing a small part, though there's no data I know of that would explain the differences, I'd be interested in reading that.