This isn't quite what you're asking for, but my wife just got a new M3 Pro MBP with 18GB RAM (5 performance/6 efficiency cores) and it's about 2/3 the all core speed of my 5950X in CPU rendering and about 1/4 the speed of my 3090 in GPU rendering.
It's (irritatingly) quite a bit faster in single thread rendering though - it's got about a 50% edge there.
I ran my i7 965 on a TRUE black and a delta fan for a while. Still don't know how I put up with that level of fan noise.