I checked the msi official website and this cpu is not listed. However I found a few other websites that say it is compatible. Should I trust that it is or better find another motherboard?
Yes, it will work. I had a very similar board, a MSI 760GM-P34 (FX), and I ran a FX-6100 on it. I would recommend a better board, though. You won't be able to overclock at all really with that board.