Emulator

What? I'm not sure I understand what you're implying but there's just no way to throw emulation code into a GPU and hope it process it, that doesn't even make sense. The console's GPU, like every other part of the virtual hardware, is emulated by the application (in this case RPCS3) which is run by the CPU.

All the GPU can do is render the output graphics like it'd do with any other PC game, it can't emulate a chip. At best you could try to optimize a little by implementing texture decoders (like OpenMP) and other stuff that can be ran by the GPU, but don't expect a miracle. In the case of RPCS3 we would need a pretty fast card because the PS3 graphics are very up to date, but nothing we don't already have today.

Well, i told i wasn't sure why emu dev don't do it

Ok, it render the output graphics to the screen but why it can't emulate a video chip? Is called GPU so it does some process (Yeah, the graphics that the PC are using but). Sorry i insist but i just want to know; maybe an McGyver developer develop a code that can be able to process info with the speaker hahahaha (Obviously not, but improvement on codes is quite interesting so i don't know what to expect)