>>280691008
Something like going from your 4690k to a 4790k, I don't think you can do much more without Mobo and RAM upgrade too. Personally I feel like that would be a waste unless it was very cheap. 4790k second hand in my country cost more than a new Ryzen 3600. Maybe better just to save the money for a total upgrade and not be stuck on DDR3 and 4core 8 thread for even longer.