Back to school!!
The first link is from nVidia and they are always lying, all manufacturers lie about their products, so people would buy 560 instead of 470.@tkin
GeForce GTX 560 - Performance - GeForce
check the graphics performance chart in the link..
Also check out these (though these have user's opinions.)
Gigabyte GTX 460 SOV vs. GTX470 vs. GTX560 - Graphics-Cards - Graphic-Displays
GTX 470 or GTX 560? - Overclock.net - Overclocking.net
and 560 can be easily OC'ed as compared to 470(which is very noisy and gets very hot) so it's a better card overall
In the later links they are talking about GTX560 Ti, the 560 that you see selling for less is the normal 560, NOT the Ti model, this is a confusion nVidia created intentionally so people would screw up and buy the 560 which is slower that 560 Ti. The 560 Ti matches the 470 when heavily oc'ed, but the normal 560 is just too slow.
Open the links and see it properly, in both the links they are talking about 470 vs 560 Ti.
When the 560 Ti launched, the normal 560 was not even hinted by nVidia, so people dropped the Ti suffix when talking about it, like how we talk about AMD 8150 but don't always say FX8150, now if AMD launches a processor that's AMD 8150 which is slower than FX8150 we would mix up.
560 Ti: GeForce GTX 560 Ti - Specifications - GeForce
560: GeForce GTX 560 - Specifications - GeForce
Check and compare the specs.