SmartPSS is mostly one thread / one CPU core app.
Plus it use a lot h.264 or h.265 video decoders..
So you should look at CPUs with high turbo one core speeds..
Modern Intel Core i7 and i9...
Plus good graphics card (higher nvidia models)..
ps. dss express / dss pro is much better solution.. Specialized for situations like integration of many NVR / DVR from several locations...
it supports modern AI features (and searches for them - like IVS or AcuPick)..