For a happier life, stick with Nouveau. Don't compromise you're software freedom with proprietary blobs!

@mdiener. I discovered to my cost that my GT620 did not run satisfactorily with ZorinOS 15. The Linux Kernel that ships requires nVidia cards that support 410 and above - which means a minimum nVidia card of GT630. I have attempted to futureproof my rig for a short period by purchasing a low-end GT1030 from Zotac (2 Gb).

That is why Zorin 15 comes with nVidia driver installs to cope with the 'newer' top end rigs - that's my take on it.
If this is going to cause issues on your partner's notebook which from another post you said had Mint on it, give FerenOS or Makulu Lindoz 15 a go. If you have computer with 1 Gb RAM then also give SparkyLinux 5.7.1 a go too - no issue with my SB sound card AND you can add DE's over the top of your choice!
Finally, E-live 3.0.6 - that has a sound configurator and even in live mode if on-board and vga hdmi sound card picked up it recognises you have multiple sound sources and asks you to choose which one to use.
My Sound Card shows up in Zorin 15 Ultimate but plays no sound. I may have to consider moving to a different distro once all manuals are complete guys.