I went from using a mid-class Dell Precision t3500 with a Intel Xeon w3520. I just needed to replace the graphics card and everything ran fine. I had the opportunity to get my hands on an Intel Core i7-6700k, I wanted it because as far as I know it is the biggest bang for your buck. Now, when I got it I knew I needed to replace my motherboard, which I did, I got the Asus Z170 Pro Gaming. I ran it, everything was fine, until I played a game of League of Legends (not the best game for an Intel Core i7-6700k, I know). I was playing and I noticed a huge frame drop from the Intel Xeon W3520 to the Intel Core i7-6700k, the game (which was on Ultra settings) was running at an average of about 67 fps. My Xeon was running League of Legends on Ultra at an average of about 127 fps. I just thought that I could just close it and rerun League of Legends, it stayed the same. I went to the Asus BIOS to overclock my processor and now League of Legends runs at an average of 27 fps no matter the quality of the picture. The graphics card is the only thing that both of the computers have in common, which is the MSI GeForce GTX 950 2GD5 OC. (I put this thread under systems because it could be a systematical problem)