Question My Dell XPS Studio 8100 Got a huge problem i need help

Mar 3, 2021
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so i used to play video games using a 10 year old macbook air i got a dell studio xps 8100 i tried replacing the i5 with a i7 and i soon found out the i7 wasnt compatable so i tried to put back the old cpu now the computer is slower than a school chromebook what do i do? also the fans are at 100% all the time please help! It went from 200 fps in minecraft to 20
 

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