Question ASUS GTX 1070 Dual OC FPS problems

Mar 9, 2019
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Hello, I recently bought the ASUS GeForce GTX 1070 Dual OC 8GB. Before that I had a GTX 660.
Ever since I installed the new one I get the same amount of FPS (circa) as before and sometimes even less which is weird. Another weird thing is when I play games my GPU usage is at 20% NEVER higher. This is really frustrating since I expected great improvement to gameplay hence my old GPU was a huge bottleneck. Even weirder is that when I play certain games after around an hour or two my fps automatically drops to like 50-60 depending on the game, and I experience huge amounts of lag. The only way to fix this is to reboot my computer. Any help with this? I'm in deep water atm as of what to do...

ASUS GeForce GTX 1070 Dual OC