Upgrade GPU or CPU

Oct 8, 2018
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My CPU is an AMD Phenom ii x4 810 and my GPU is a R9 380 4GB OC. Which should I upgrade, my fps is pretty low. Is my CPU bottlenecking my GPU?
 




I have the MSI 970 Gaming Motherboard, it has a AM3+ socket. Would upgrading to the FX-6300 allow me to have smoother frames?
When I play games such as Fortnite, I can hit higher than 60 but it looks choppy when I turn around.
 

I would go straight for the best in slot CPU for this board, something like FX-8350.

 


My PSU is 500 Watts, I don't think it'll have enough power, what do you think?