http://www.edge-online.com/news/power-struggle-the-real-differences-between-ps4-and-xbox-one-performance/
PlayStation 4 is currently around 50 per cent faster than its rival Xbox One. Multiple high-level game development sources have described the difference in performance between the consoles as significant and obvious.
Our contacts have told us that memory reads on PS4 are 40-50 per cent quicker than Xbox One, and its ALU (Arithmetic Logic Unit) is around 50 per cent faster. One basic example we were given suggested that without optimisation for either console, a platform-agnostic development build can run at around 30FPS in 1920×1080 on PS4, but itll run at 20-something FPS in 1600×900 on Xbox One. Xbox One is weaker and its a pain to use its ESRAM, concluded one developer.
Microsoft is aware of the problem and, having recently upped the clock speed of Xbox One, is working hard to close the gap on PS4, though one developer we spoke to downplayed the move. The clock speed update is not significant, it does not change things that much, he said. Of course, something is better than nothing.
drakekratos
More at the source.
This is yet another article with devs stating how much more powerful PS4 is. MS wants you to pay $100 extra for a weaker console... they say Kinect adds value, but their are no games for Kinect.
That dev who claimed in your Edge link should have put their name on it.
http://www.videogamer.com/news/xbox_one_and_ps4_have_no_advantage_over_the_other_says_redlynx.html
Speaking to VideoGamer.com at E3, Ilvessuo said: " Obviously we have been developing this game for a while and you can see the comparisons. I would say if you know how to use the platform they are both very powerful. I don't see a benefit over the other with any of the consoles."
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http://www.videogamer.com/xboxone/metal_gear_solid_5_the_phantom_pain/news/ps4_and_xbox_one_power_difference_is_minimal_says_kojima.html
"The difference is small, and I don't really need to worry about it," he said, suggesting versions for Xbox One and PS4 won't be dramatically different.
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http://gamingbolt.com/ubisoft-explains-the-difference-between-ps4-and-xbox-one-versions-of-watch_dogs
"Of course, the Xbox One isnt to be counted out. We asked Guay how the Xbox One version of Watch_Dogs would be different compared to the PC and PS4 versions of the game, to which he replied that, The Xbox One is a powerful platform, as of now we do not foresee a major difference in on screen result between the PS4 and the Xbox One. Obviously since we are still working on pushing the game on these new consoles, we are still doing R&D."
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link
"We're still very much in the R&D period, that's what I call it, because the hardware is still new," Guay answered. "It's obvious to us that its going to take a little while before we can get to the full power of those machines and harness everything. But, even now we realise that both of them have comparable power, and for us thats good, but everyday it changes almost. Were pushing it and were going to continue doing that until [Watch Dogs] ship date."
http://www.polygon.com/2013/8/1/4580380/carmack-on-next-gen-console-hardware-very-close-very-good
Carmack on next-gen console hardware: 'very close,' 'very good'
http://www.edge-online.com/news/gaijin-games-on-why-war-thunder-isnt-coming-to-xbox-one/
How much more powerful?
AY: It depends what youre doing. GPU, like 40 per cent more powerful. DDR5 is basically 50 per cent more powerful than DDR3, but the memory write [performance] is bigger on Xbox One so it depends on what youre doing.
How is that going to translate to on-screen results for the kinds of games you want to make? So to optimise War Thunder on both consoles you could hypothetically make a better, prettier version on PS4?
AY: Yep.
KY: Probably yes. But again, thats not a very big deal.
http://www.edge-online.com/news/power-struggle-the-real-differences-between-ps4-and-xbox-one-performance/
Xbox One does, however, boast superior performance to PS4 in other ways. Lets say you are using procedural generation or raytracing via parametric surfaces that is, using a lot of memory writes and not much texturing or ALU Xbox One will be likely be faster, said one developer
PS; Without the effective ESRAM usage, X1's GCN can be reduced into 7770 like results.
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