This is a minor terminology mix-up. The term you want here is "CCX". Each CCX holds multiple chiplets.
See https://www.tomshardware.com/reviews/amd-ccx-definition-cpu-... for more details.
EDIT: It does look like my own information on this was rusty.
A "chiplet" is not an individual core, but a trimmed down die that does not have a memory controller. A "CCX" contains cores (within a chiplet) and L3 cache.
https://www.hardwaretimes.com/amd-ccd-and-ccx-in-ryzen-proce...
> The basic unit of a Ryzen processor is a CCX or Core Complex, a quad-core/octa-core CPU chiplet with a shared L3 cache.
From that link, your statement does not appear accurate. Multiple CCX's appear on a given Core Chiplet Die. There are indeed two vs one core chiplets on different Ryzen designs (plus the IOD).
Apparently Intel's trying really hard on an old process to get the performance crown, forcing AMD to clock higher than they'd like to compete. It's ridiculous that they double the power for 10% performance. But the nice thing is you can half the power and take the 10% hit.
Also note that the 7900/7900X are dual chiplet design that has a significant power impact. The 7700x and below have a single chiplet and saves power, and also increases single thread perf. If you look at the gaming benchmarks the 7700x is often better than the 7900x, not to mention all the Intel chips except the top of the line i9.
So if you buy the 7700x and underclock just a bit you should have a very efficient desktop.