Here is your Asus Motherboard's CPU SUPPOT LIST: https://www.asus.com/SupportOnly/M5A97_R20/HelpDesk_CPU/
See which is better than the one you currently have. But to tell you truth the difference between the various FX 83xx is not that big of a difference. It really wouldn't be worth spending money.
I would rather upgrade to a Ryzen Motherboard - AM4 Socket Motherboard if it is within your budget. But the FX 8xxx series processor are a very good processor series.