DJs right I had that same set up in the past max 40 frames
+1 afterburner is a great program if your temps are too high your proccesser will scale back to stay in a safe temperature range it may also be worth re applying some after market thermal paste between your CPU and it's cooler
Afterburner link https://gaming.msi.com/features/afterburner
Something else to consider is viruses you may be unaware of, they can cause severely slow speeds if they run in the background consistently I recommend using malbytes to scan your PC however if you reinstalled windows this should not be a problem
https://www.malwarebytes.com
I would also highly recommend getting a solid state drive instead of a hard drive this may help with some stuttering
If your tight on a budget I recommend this solid state drive I've been using it in my brothers computer for about 4 months with no issues
https://www.amazon.com/gp/product/B013J7P7SK/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
And finally give this a shot credit to lethals for this amazing guide