The PS4 is not powerful enough to emulate a PS3....... Even the PS4 GPU would severely struggle to emulate the PS3 GPU 1:1 (very possibly not even possible) and you are talking about offloading to the GPU?
It is (power isn't the issue here, PS3 isn't anywhere near as capable as PS4), RSX is a cut down Nvidia 7800 GTX, it's exponentially weaker than what PS4 has. RSX wasn't exotic at all, it's basically a cut down version of a PC part.
PS4's GPU could emulate multiple RSX chips at once, in the case of PS3 the main issues are that Cell was exotic and that it's PowePC core used a RISC Instruction Set, while SPUs (SPEs) use their own custom one called ISA and a number Floting Point Operations were handled by that area of PS3's hardware, rather than all of them being done on the GPU.
PS4 can handle all of the Floating Point math on it's GPU, which is why I said Cell code could be moved over to PS4's GPU, leaving the available CPU cores to emulate the multi-threaded PowerPC on Jaguar.
PS3's PowerPC (not speaking about the SPEs here) is 1/3rd the amount of hardware present in 360's core CPU, yet XB1 doesn't have any issues in emulating this, even though it's using a RISC instruction set. PS4 would only have to worry about 1/3rd the CPU load, with the GPU handling SPE work.
Sony only needs to write a program that recognizes RISC and ISA code as X86, along with offloading SPE code to PS4's GPU.
TBH developers could probably write an efficient program that could do this with only a few times the power of PS3.
You missed the boat man.... Emulating the PS3 GPU mean emulating the PS3 architecture. The PS4 GPU COULD NOT EMULATE the PS3 GPU in the PS3's native language.....
No I didn't miss anything, I understand the issues fully here, through extensive research on the subject.
You're not giving any arguments that support your stance on this subject, just insisting you're right, because you're right, it's circular non-logic.
As I said before the RSX is a cut down 7800 GTX, this is a standard NVidia PC GPU, which is substantially weaker than what's in PS4, emulating an NVidia GPU, with a substantially more powerful AMD one isn't hard to do, the tech may be somewhat different, but it's not massively exotic, if anything it's nothing more than a nusance issue, one that can be solved very easily, hell the original XBox had an Nvidia GPU, yet 360 had an ATI one, 360 could still run the OG XBox games when they were patched.
PS4 doesn't need to run PS3 games in their native language on PS4, it only needs to translate RISC and ISA code into X86 and as I said before that solves the language problem.
The next issue is that PS3's Cell processor is a mash up of a CPU and Floating Point hardware, the Floating Point math can be handled by PS4's GPU.
As for the PowerPC tech, 360 has 3X the cores compared to PS3, so PS4 has ample CPU hardware to deal with this side of the technical issues.
I've explained every area here, PS4 can be made to run a virtual PS3 on it's hardware and thus play PS3 games, it only needs for Sony to set up a team of programmers to solve these technical issues and they could definitely get PS3 games up and running well on PS4. You're not giving any technical explanations for why this cannot be done, I on the other hand have given a technical explanation of how it's definitely achievable.