For instance, I've read that this could handle Fortnite on Epic settings at 1080p or 1440p with 60+ FPS, but I assume I'd need a new motherboard and don't know which one would be best.

Would this work?

Thanks so much! Could you tell me what you think about pairing either this or this with this? One question I have is.. do those have better graphics than the 2x AMD Radeon HD 6750s I have? I saw someone say you could still use GPUs with the APU, but would either APU be better in the first place?

Sorry for asking so much, I'm just on a tight budget and don't want to spend a bunch and find out something isn't compatible or isn't even an upgrade.