Do not know about Mint, but 304 is not supported in Ubuntu anymore.
Doubt if you need bumblebee as that is for laptops with switchable graphics.
I have GT620, but use nouveau for most of my installs. Cannot tell difference between that and installing nVidia driver. I did not think I had nVidia in this install, but now Ubuntu autoinstalls it with some of the newest installers if you check install proprietary drivers.
Code:
fred@bionic-z97:~$ dkms status
nvidia, 390.116, 4.15.0-52-generic, x86_64: installed
nvidia, 390.116, 4.15.0-54-generic, x86_64: installed
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