Can I do 144 FPs in low settings 1080p Fortnite with an I5 4590, RX 590? And would you need to buy such a Pc for 250 euro on Ebay? (I will upgrade to a Ryzen 5 2600 or better later)
Buy something on Ebay, I don't know.
You do not know if the PC is working properly and if it has a defect, the seller does not take anything from you. Wait a bit and buy a new PC or check the Internet with reputable dealers for offers.
Ok, I would build it myself, but do you think i5 4590 and Rx 590 can do 144 fps or more?