As i said, that could mean a lot of things, for example they did not say anything about reducing ROP number, and they did. I dont need a deep analysis, but that 59% could easily be the result of freq increase and the use of DDR4-3200.Do you expect a detailed circuitry analysis? Here is a excerpt from an article by Tom's. This is not a straight port to 7nm.
'AMD chose to stick with the Vega graphics engine found in its previous-gen Picasso APUs because its hasn't optimized Navi for mobile yet, but the company chose to make several architectural enhancements when it ported Vega from the 12nm to the 7nm node. That includes reducing the number of compute units (CU) from 10 to eight, but a range of improvements led to an overall performance increase of 59% per CU (based on TimeSpy test results).'
Maybe cutting rops by half and reducing CU number along with the die shrink helped to archive those high freqs. But thats my guess, and nothing they said leads me to belive the Renoir CU performs better per clock than Picasso CUs. And thats was my point when we were discussing Renoir IGP a few months ago.
Wharever they did allows for very high freqs, thats is what makes up for the CU loss.