Hmmmm.... I think graphics are important but prettier graphics don't make the games better in most cases, that being said, these boxes all look pretty bad next to a decent PC even if the supposed "code to the metal" is applied to them when talking about power. You can get a 390 USD GTX 770 right now(faster than a GTX680, comes in 2GB standard or 4GB for about 440 USD or so) and toss that into a 6 year old PC running K10s or Core2s, and that will run laps around the new consoles already. It would of course cost more to build an entirely new PC but the upgrade path is also a viable one if you just have something laying around. You can go AMD 7970GHz Edition for about 10 bucks cheaper but Nvidia GTX 770 has excellent driver support and PhysX while being faster in most benches so......

Anyways, 8th gen consoles are somewhat disappointing to me so far as powers go, but I'm sure there will be good games on all platforms and that's what really counts.

Oh and Nintendo obviously packed the entire universe into the Wii U with over 9000 power levels so if one unit fails, the universe will implode.

I'm sure that GPU which PS4 has the potential to meet the High End GPU's of PC because PS4 GPU has optimizations which is not possible with PC GPU's so PS4 GPU Can match close to 7950 performance atlest, we have to worry about the Wii U and Xbox one GPU which doesn't has enough hardware in GPU to match High End GPU performance since its bottlenecked with DDR3 and 32MB SRAM by complicating which needs more tricks for developers to get most out of it.

You could call it "peak bandwidth" and yes it is achievable. What you do is put certain commonly accessed data in the 32MB cache, then read from it over and over, while also reading over the main bus.

It's not obviously 100% ideal, but it works well. The 360 had half the main bandwidth as PS3, yet often had better particle effects. Why? Because it had 10MB EDRAM. The same concept with XBox One.

Also, the Xbox has a weaker GPU to start with so it needs less BW to feed it to begin with.

Also, not sure why the OP calls the PS4 GPU between 7870 and 7850, it's really much much closer to a 7850.

Just one example:

7850=1.76 TF
PS4 GPU=1.84 TF
7870=2.56 TF

You can see PS4 is MUCH closer to the 7850. 7850 also has 32 ROPs like PS4, so I dont see any major spec deviation. PS4 has 18 CU's vs 16 CU's of 7850, but the 7850 is clocked 860 vs 800 for the PS4 negating most of the difference. For example PS4 has 72 TMU's vs 64 for the 7850, but once you adjust for the higher clock 7850 has ~69 TMU's relative to PS4's clockspeed. Similarly 7850's 32 ROP's will process slightly faster than PS4's since it's clocked higher.

So it's best to call PS4 GPU basically a 7850 and XBO basically a 7770 imo. Bringing 7870 into it skews things. XBO GPU is a very little stronger than 7770 just as PS4 GPU is a very little stronger than a 7850.

There is one major exception and it falls in favor of the XBO, the 7770 only sets up one triangle per clock, The XBO GPU, PS4 GPU, and 7850 (and all higher AMD GPUs) set up two triangles per clock. A pretty major plus of the XBO GPU over a 7770.

Which potential? Theoretical maximum is 1.8 TF. Done. There are GPUs available that alone have more Teraflops, leave aside way better CPUs. All this optimization, coding to the metal etc.pp. is not so important and crucial as many think.

So basically, the short version of the OP is:

All three consoles will/can have gorgeous games. This generation is going to be all about scalability for multi-console games.

Also, obviously the OP has no agenda in promoting the PS4, despite avatar and signature. Good to know.

Do you think PC GPU's are optimized to the TF that it is capable of for every game? They consider only mainstream GPU as base to work on the Game so it can be supported by many GPU's which leads to ignoring the TF of high End GPU's in optimization to get more. We can achieve FPS of High End PC GPU's in PS4 GPU with optimiztions to get it running smooth upto 60FPS.

Developers are not exploring PC GPU's potentional very well due to fragmented GPU models with different specifications and architecture but PS4/Xbox/Wii U has optimizations which developers can focus and get most out of it by close to its throritical TF.

But, PS4 GPU has some modifications so we can consider to place it between 7850 and 7870.

Who is "we"? Nowadays engines scale quite good over all variations of GPUs, especially thanks to DirectX. And they are also doing things like TressFX which exploits modern GPU capabilities. There is simply no way for PS4 to compete with high-end-gpus - the comparison itself is false. The 1.8TF is the whole APU, leaving out PC-CPUs makes the comparison false.

And what about the 60fps? Which games for PS4 are confirmed 60fps?

I am not a PC gamer and I don't really care for PC gaming but comparing PS4 to high-end-gpus is... legit, of course, but gives a wrong picture and saying PS4 can compete with them is... wrong. It doesn't.

I don't know why anyone would compare it - we console-gamers get better graphics than we had before, that's important.