You could have asked this in one of your multiple Red Dead threads. I think at least a few of us would prefer one thread per game series. There is no need to have 3 Mafia threads and 3 Red Dead threads all within 24 hours of each other
As for your question I don't actually know. I know system requirements don't always mean shit, but it is a place to start, and get an idea of what the game will need
Edit: as with most of your questions, it is a quick search away to find an answer. If you actually engaged in any of the conversations I would be more inclined to post it for you. You seem more interested in asking questions than actually receiving any answers
I agree that OP could make more structured and elaborate threads, but I wouldn't call him a clown or spammer for that much.
Might I remind you that you can just ignore him if you don't want to see his threads? Like that those who wish to engage on those threads still can and you won't be bothered anymore.
If OP break a community rule or a site wide rule, we will ban him, after warning him, but not otherwise.
But perhaps a good community rule would be to make threads that are conducive to discussion rather than single answers that can be found with a quick web search.
I bet it would probably work. You mentioned you're buying this, just make sure you're not getting ripped off. This isn't a very good system for gaming (considering how ridiculous system requirements for modern games are) so I hope your guy isn't trying to pass that off as such. You can get stuff like this really cheaply on ebay, especially if you have the patience to bargain hunt.
Please just check the system requirements next time, unless you're facing special circumstances or have reason to believe the official specs are inaccurate. You can find them on the publisher's web site or the Steam Store page.
I played rdr2 on a 1060 3gb before I upgraded my card. I had to turn pretty much everything down to low except for texture quality, keep that high or at least medium cuz anything lower and it straight up becomes a ps2 game. Was able to get around 50 fps most of the time, up to 60 indoors and 30-40 in saint denis. Your 4gb card should get better performance than that due to higher vram tho.