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Zen 1 1800X ST 4Ghz
Zen+ 2700X ST 4.3Ghz +3% IPC +7% Frequency
Zen 2 3950X ST 4.7Ghz +15%IPC +9.3% Frequency
Zen 3 5950X ST 4.9Ghz +19% IPC +4.2% Frequency
Zen 4 7950X ST 5.7Ghz +13% IPC +16% Frequency
Zen 4 is the generation with the biggest single-threaded improvement
To summarize.
1. 9700X single-threaded performance is great
2. 9700X multi-threaded performance is limited by the 65W TDP and has no advantage over the 105W TDP 7700X.
3. Gaming performance is only marginally improved.