Anandtech have updated their article after some testing of Crossfire. Again when it comes to multi gpu Crossfire is providing the smoothest gaming performance available.
Source
http://www.anandtech.com/show/8643/...crossfire-with-mantle-sfr-not-actually-broken
Aside from Anandtech here is what a selection of the press are saying about it.
Ryan Shrout, PCPer: (
LINK)
“It's a very interesting discussion - would you rather have the much higher frame rate of the pair of GTX 980s or the smoother frame rate of the R9 290X cards running under Mantle? Even though the Mantle score is the lowest result in average FPS of the three, I actually think I would prefer that option!”
“But AMD has the advantage with Firaxis decision to implement a Mantle code path for Beyond Earth and the result is a very solid product; maybe more complete than any other Mantle game to date. In single GPU testing, Mantle is able to bring the R9 290X on to the same performance level as the GTX 980 and in the case of our 4K testing, slightly edge ahead of it.”
Scott Wasson, The TechReport: (
LINK)
“Nvidia vaguely hinted at a change of approach during its GeForce GTX 970 and 980 launch when talking about VR Direct, its collection of features aimed at the Oculus Rift and similar devices. Now, AMD and Firaxis have gone one better, throwing out AFR and implementing split-frame rendering (SFR) instead in the Mantle version of Beyond Earth.”
“All I can say is: thank goodness. Let's hope we see more of this kind of thing from AMD and major game studios in the coming months and years. Multi-GPU solutions don't have to double their FPS averages in order to achieve smoother animations or improved responsiveness.”
Firaxis Games: (
LINK)
“However, we believe the time is ripe for multi-GPU machines to provide a user experience just as good as single-GPU systems, and with the explicit multi-GPU control provided by AMD Mantle we have started working to make this a reality. Finally, we will, as always, continue to work hard to ensure a great play experience in Civilization: Beyond Earth across the entire spectrum of supported PCs.”