Mimimum requirements for a perfect emulation

8600K is also better for RPCS3 because it has TSX which that benchmark likely doesn't test for

You can keep your games as ISO files yes, but every time you want to boot a game you'll have to mount the ISO to a virtual drive.

The emulator can use DLC and updates yeah, either dump them already installed from a PS3 or dump the package and install via package.