Mainboard
Mainboard
This machine is my current setup but it was shipped with an i3 processor instead of an i5.
You should consider upgrading your GPU instead of the CPU or motherboard. Look for a used RX 570 or RX 580, or GTX 1060 on eBay.
You can find affordable i5 2400 or 3470 chips for a solid performance boost, or opt for an i7 2600 if you're willing to invest a bit more. Don't forget to purchase some inexpensive thermal paste for the new CPU. Because you purchased the PC from eBay, you can also source additional components there as well.
I already have a new GPU, it's an Radeon R9 390. My dad is getting me a mid-range tower case, which is why I was thinking about upgrading my CPU and motherboard. I was planning to buy an LGA 1155 ATX motherboard but couldn't find one for my PC.