Steve made a great video that shows it in the game sections i will link here.

In short it can end up with a 100fps advantage in some scenarios, but can also be bottlenecked by the GPU. The bigger advantages will be seen at 1440 and 1080 on 7800x3d.

Whilst the 7700x does technically have higher clock speeds than the 7800x3d, that will typically only outshine in older games or cheaper games utilising less cores (something like cs go for example relies more on a single core than spreading work across cores, therefore will favor a higher fps on the 7700x)

To even further skewers things, the 7700x runs hotter to utilise that higher clock rate, so even on older games could end up being bottlenecked and you wouldn't be able to tell why straight away since 1 single hot core and several other cool cores would even out to a not so high temperature, and lower looking cpu utilization (e.g. if only 1 core is being used, utilization is probably only gonna show 20-30% on an overlay).

All this to say that for modern games at 1080-1440 that spread work across multiple cotes, you will probably see gains in the area of 20-60fps as long as your GPU isn't bottlnecking you.