Question My PC slows down..After upgrading

Jul 1, 2019
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So I had a setup of i5 4th gen
+ 6GB ddr3 ram with a 1050Ti gfx card.
I had installed forza horizon 3 and played it pretty well with minor stuttering here and there.. I thought it was because I had less recommend RAM which is 8..
So now 5 months from that I upgraded it to 8GB ddr3 ram and installed forza again but this time instead of smooth fps as I was expecting I am getting constant fps stutter even in medium settings (1080p) bare in mind I had played this game with minor fps drops in high graphics settings 5 months ago even with only 6Gb of ram.. Can somebody please help me with wtf is wrong?
 
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