sizing / capacity planning tipps related to expected request or transactions per second

Hi,

are there any nice rules of thumb about capacity planning in relation the expected
amount of transactions or request per second?

For example, if I have around 100 000 transactions per second on a 5 TB database.
With what amount of Memory and CPUs/Cores and which settings would you basically
Start to evaluate the performance.

Or are there any other recommendations or experiences here?

Thanks and best regards

Dirk