A lot of people are using Primavera with SQL Express database. And after using Primavera for a long time, we may realize the software become slow.
Our database is become bigger and bigger. And the slow performance is may be because of the limitations of SQL Server Express Edition, not because of the CPU or RAM.
Based on the table you can see SQL Express only support:
No matter how your PC is strong, it only take a few resource from it.
So you may consider buy SQL Standard Edition before upgrade your PC hardware.