New Mobo+Cpu, weird FPS?

Zer0Ctrl

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Nov 22, 2015
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So I just today upgraded to a new motherboard and CPU.
i7-7700k, Corsair H75 AIO and a ASRock Z270 Killer Sli Board, along with 8Gb of Gskill aegis 3000Mhz ram.

I have kept my old gpu which is an MSI R9 380 4gb, as I felt like altogether the build would give me solid no stuttering FPS. Which turns out, is the case in most games! Need For Speed 2016 plays at the highest settings with buttery smooth 70 fps. One problem, league of legends, a very undemanding game, is stuttering like crazy? No matter what settings I put it on, whenever I move ingame the fps drops dramatically from high 200's to 50's and even 20's, making the game literally unplayable. This happens also in space engineers where whenever I move the mouse, I experience insane FPS drops. I'm wondering why these less intensive games are lagging and if anybody has suggestions on how to fix them, please do share because I really, really want to be able to play them. I think it's something to do with my GPU usage.

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Here's an image of my GPU and GPU Memory Usage graphs, the orange being the former and the purple being the latter.
 
Solution
It could be some games depended on some driver that the old motherboard had that is now unavailable.

Regardless, it is always a good idea to reinstall Windows whenever you change out the motherboard.


I tried but kept getting errors about it so I didn't think I needed to, and now windows is telling me my product key is invalid when I've inputted the same one I've installed windows with multiple times.
 


That interests me. If some games play perfectly why wouldn't some, regardless of a clean windows install?
 
ya you gotta do a fresh win install with a mobo change. windows still "thinks" you have the old hardware and is confused as to what to do. there is a more technical reason for this but i digress. if your getting errors in a install then you got more problems than just fps drops.