Quantum break doesn't need more than an i5 2500k and 8GB ram

(which is what pc users were buying in 2011)
If it did then a skylake cpu wouldn't help you as it's only about 20-30 percent faster...
Maybe you misunderstood what I said: cpus have not gotten meaningfully faster in the last 5 years, so if you bought a good quad core in 2011 it's still just as good today as it was then. You need to know that a 4.5ghz i5 2500k is 3-4x more powerful than the ps4 cpu, that is plenty to brute force even poorly optimised multiplatform games and then some.
It's a big change to how it used to be, the days of rapid advancement for cpus have been over for years. We might see a big (one time) bump next year , hopefully, if amd brings powerful 8 core cpus to the mainstream, if that happens you'll be right again