I’m pretty sure multithreading does
Not double performance. But I might be wrong.
I'm more than certain devs will be able to put those threads into a really good use - CoD:MW even on PC already does perform pretty much exactly the same on 4C/8T as on 8C/8T CPU, so on consoles things can get only so much better.
the current ones have 8 threads.
so 16 threads would be a 2x increase.
but I think the theoretical performance numbers is what Microsoft means when they say 4x as powerful.
Well, given Ryzen (1) has more or less 50% more IPC than Bulldozer, which again has 50% more IPC than Jaguar, we are already talking about ~2x more processing power (if not more) just from the architecture change. Then we have the clocks, that are not revealed yet, but anything above 3GHz is pretty much a given, so we have about 2x increase here as well compared to 1,6-1,8GHz of the Jaguar. So twice the IPC and twice the clocks = 4x more processing power.
Now, if there will indeed be 16 threads, then we have another 2x multiplier added to the mix. And looking at how Spencer's "2x more GPU power" translated into just raw 2x TFlops, without even taking into consideration any RDNA(2) performance advancements, I think it's safe to say that by 4x he meant just core vs core performance, without taking anything else into the equation.