Amd chips are significantly cheaper to produce than intel chips, intel has been selling with low margins for past gen to compete with AMD, who has large profit margins
I've heard intel investors are kicking back on that decision, so intel prices are likely to rise
latest zen4 news is also that early batch(prototypes) zen 4 vs zen 4 stacked is up to 40% performance improvement.
In comparison, same thing for Zen 3 vs zen 3 stacked is only up 15%
With TDP's equalized
that is from leaked AMD internal testing documents
so zen4 stacked sounds like it is going to be very very nice