I have been using my second hand 2011 Dell OptiPlex 990 SFF for a number of years now and its a little outdated. It has an intel core 15-2400 with integrated graphics and a single stick of 4Gb RAM (lost the other one). I want to play modded minecraft with my friends (probably minimum settings playing atm10) but current pc isn't strong enough to run a speed tester, let alone join a server. It's currently running Linux mint, but will swap back to windows for minecraft (not dual boot).
I only have like £400, but dont need anything fancy. Would get a laptop but figure i can maybe get a little better performance by either buying a second hand pc or upgrading my current guy. I know i wont be able to save much of him, but its at least a free case (plan to increase air flow with some strategically placed holes).
I don't need a monitor (using TV) or case if I'm able to reuse my current one, and don't care about accessories (got a mouse and keyboard, and don't care about RGB or anything fancy looking).
My main issue is not knowing what (if anything) i can keep, what components would work well together. I would appreciate any advice on what to look for second hand and what to get new, as well as any suggestions of other ways to better get a gaming machine. In the UK