Quote Originally Posted by cadaveca View Post
Sideport is still there on single gpu's...there is no longer ringstops for that. SO it should be the same for Crossfire via mobo pci-e, or crossfire via vga board pci-e...either way you are no longer using memory resources for multi-gpu communication, and using the side port instead. R700 excels due to lower latency due to less physical distance between the cards, as well the PLX chip should offer at least 16-lanes of pci-e 2.0 between the cards in combination with the side port, whereas some mobo's will not give the same connectivity.


there's moer issues at play in "microstutter" than anyone is really aware of, other than maybe myself and those that built the cards...and even then I doubt they are putting all that much work into it...you can only fix what's broken, you can't fix something not broken!
What I understood, is that the sideport is only used in the 4870X2, not while using crossfire.. 4870 crossfire uses PCI Express 2.0 instead of 1.0 crossfire-bridges.