Is $500 a fair price?

Title. I have a coworker who is offering to sell me his old gaming PC for $500.

Specs: CPU: Intel i7-4790k GPU: RTX 2060 16GB RAM 1TB 1000W Powersupply

I know the parts a bit outdated, but I’ve been trying to find a mid-range gaming PC for a minute without breaking the bank. I have no idea what current market prices are looking like, aside from RAM being stupidly expensive. $500 feels fair, but I really don’t know