Here is a HS3 users combo box. Main Ubuntu OS is on a separate SSD drive. (1 SSD plus 8 RAID configured drives).
Note here running HS3 Pro on similiar CPU / Memory but on a separate box.
1 - 8 drive NAS with two raid partitions on it. (4Gb enterprise drives).
2 - HS3 Pro machine (doing a few HS3 plugins).
3 - WeeWx machine (using Apache2)
4 - KODI machine
5 - LSi 8 drive raid card.
It is sitting next to the LCD TV in the family room at the users home.
I suppose that I could turn my NAS box to a combo box with no issues after testing the above box. It is running BSD FreeNAS right now.
It is a small footprint box but heavy with 8 drives in it.