Will I need a better PSU if I start mining?

Communities Science, Engineering, & Security
1

Here's my build

GPU: HD7870

CPU: FX6300

Fan: Stock

PSU: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

2

You're fine.