Just my 2c....
I went through a similar process to upgrade my aging ACER to handle some BIG, FAST downloads from my ASI 174/ ASI 183 when doing solar. A Typical SER file is >3Gb...
I ended up going for a "Hot sexy" Gaming Machine - an MSI.
https://au.msi.com/
This has a i7 processor, 16 Gb RAM and a 1Tb SSD drive as well as a 500Gb HDD and the required USB3 ports.
Touch wood, it's fast and works 100% for me.
Yes Win10, but no issues.
I run CdC. EQMod, AstroArt, Firecapture, SharpCap, Registax, Imppg etc.
Download the SER files to the SSD drive, and then transfer to the HHD for processing....