If you want to mine Eth you need a 6gb GPU. Very little to mine with 2gb card > https://minerstat.com/dag-size-calculator
I use old mobo x58 ud5 1366pin from first gen i7-950. I declock and use less cores on cpu to save some power.

How much is your power?
My state has had highest power cost in world for 15yrs+ and I still mine (us$0.28c/kw) and that is cheapest our of all companies.