AMD Zen 5 and 6 CPU details and performance 'leak' and slightly disappoint

pcgamer.com:

Serial and somewhat hit-and-miss YouTube 'leak' channel, Moore's Law is Dead, has unloaded some technical details and performance expectations for AMD's upcoming Zen 5 and 6 CPU architectures. The headline takeaway is arguably that it involves more modest performance gains than previous rumours.

Just in case you've forgotten, AMD's current Ryzen 7000 CPUs use the Zen 4 architecture. That was seen as a relatively modest improvement over Zen 3, offering as it did 13% performance gains on average over Zen 3 in terms of IPC, or instructions per clock.

In other words, for a single software thread running on a single CPU core at the same clock speed on both architectures, Zen 4 is on average 13% faster. 

So, what can we expect from Zen 5 and 6? According to MLID, Zen 5 (optimistically codenamed Nirvana), will deliver between 10% and 15% IPC gains, with Zen 6 adding another 10% when it arrives as a more 'derivative' architecture. 

For historical context, AMD claimed the Zen 3 architecture in Ryzen 5000 CPUs managed IPC gains of 19% over Zen 2. In pure IPC terms, then, neither Zen 5 or Zen 6 look terribly exciting. Worthwhile gains, to be sure, especially when compounded. Taken together and assuming the top end of the scale for Zen 5, that would make for 26.5% IPC gains overall from Zen 4 to Zen 6.

Of course, there's more to CPU performance than IPC. So what else is MLID claiming? The 'leak' includes some fairly granular detail including an increase from 6 to 8-wide instruction dispatch, six ALUs per core instead of four, and various other upgrades. Big improvements for AVX floating-point performance are claimed, too. In fact, the changes are comprehensive enough that the forecast IPC gains look rather modest.

Indeed, previous