What technical characteristics should be considered first of all when choosing a video card for mining?

Question

Video cards

Actually, the question for the owners of farms (former and present) - what characteristics of video cards were you guided in the first place when you bought them for mining - GPU model, frequency, video memory size, etc.?
I’ll make a reservation right away: let’s leave out the topic “why do you need this” and “mining at home is not profitable”. I have another interest

Answer 1

Giga Hash Per Second