Life is a constant learning process
Forgot to say , If you want to use your current rig for rendering until you get a better..
You should invest some time into how 3D games "cheat" to make things look realistic. i mentioned some tricks used.
You would benefit a lot from that. + if you ever want to do realtime 3D(unreal etc), its knowledge worth having with you.
If you want to "simulate" a lot of real lights and shadows with gi/ao etc. you're going to spend a lot of time rendering with current setup.
But basically any PC today can do renders. only difference is how fast its done.
In general. When there is no more vram left. it will use system ram.. and when the system is out of ram. it will fall to the swap.
so along as you have a ram and swap available, it will always be able to fall back to software render.
but it will be slower than a dead turtle.
For about 15+ years ago, my pc broke down, i had a water coolant leakage and blew up my cpu, and mobo.
I was left with my laptop which was an EEE Asus Pc .. "worst thing i ever had".. I Installed my 3D program on it and did a model of a glass coffee cup on a table. It took 10 days to render a single image at 1920x1080.. lol..
when i got my new pc(14 days later) i rendered the same scene.. it took about 30 seconds
