My estimated specs of the PlayStation 5

[Pemalite]

globalisateur said:

Tflops are still the best way we have to compare consoles. It's not perfect, of course but it works very well IMO. Just look at the similar number of Tflops in very different technologies, if you add CPU + GPU with X360 and PS3, most recent games reached a good parity (GTA5) like the number of total Tflops would have told us.

A good another example would be the Wii-U but I won't go further here...

About 4K, a 4 Tflops card is already enought to have a locked 30fps in some 30fps multiplatforms games already like NFS or Batman. Just imagine what a better tech and 10~15tflops could do.

And crossfire tech is innefficient and shouldn't be used as a reference.

A single Radeon 7970 can push past 4 teraflops, considering I had three of those... It most certainly is not enough for 4k for demanding titles like Battlefield 4, Crysis 3, Metro 2033 and last light.
And this is only the start of the generation, games will eventually become more taxing.

As for Teraflops, if the Xbox One theoretically had the same amount of "Flops" as the Playstation 4 but retained it's memory hierachy, it would be slower in most cases (Especially when it hits the DDR3), faster in others (When it hits the eSRAM), hence it's pointless, there is no "best way" to compare different hardware, only logic and a decent understanding of the technology.
Besides flops is a way to gauge floating point arithmatic, you have integers to worry about too and on top of that GPU's have other fixed function hardware independent of it's flops like the Geometry units that can affect performance.

As for Crossfire, in dual-gpu scenario's it actually is very efficient, in most cases you can get 95-100% scaling.

Thus by extension a single Radeon 7970 may be enough for games at 2560x1440 and lower today and in some instances enough for some games at 4k (Older titles it could handle), but tomorrow is a completely different kettle of fish.
Running my games at 7680x1440, three Radeon 7970's stuggled in a ton of games, four Radeon R9 290's aren't even a guarantee for 60fps. (That's over 20 Teraflops folks!)
And 7680x1440 is only roughly 20% more pixels than 4k.