What? There's no games optimized for 3D cache - 3D cache is faster in pretty much every game by about 30% unless you're GPU bottlenecked. Theres a tiny handful of games that don't benefit from cache but they're outliers.
If you can swing a 9800x3d then great but if you're playing on a 5070ti in 4k then it's not really worth - might as well grab the 9700x and spend the rest of the money on stepping up to a 5080.
For 4k 240HZ the GPU matters so much more than anything else - you will be pretty much GPU bottlenecked the whole time so a 5080 that you OC the pants off of actually makes sense even though it costs a kidney basically get the GPU - budget board, budget 6000 cl30 kit, 9700x, budget everything else and a 5080 will give you the best experience.
You can even get a 7700x (or even a 7700 - unlocked you can OC it) for alot less as well and that will also serve you well at 4k with that card -- it's not much slower than a 9700x at all.
You can juice a 7700 to stock 9700x speeds... -
their base clock is identical.