GPU Usage fluctuating while playing games

Danoded

Honorable
Dec 4, 2013
420
0
10,960
My GPU Usage drops to 50-56 from around 80-96 while playing all modern games and using a SAPPHIRE Radeon HD 7870 GHz Edition. What can be the cause for this? I think it may be my CPU which is an FX-4130 that is causing it to bottleneck.
 

Danoded

Honorable
Dec 4, 2013
420
0
10,960


I'm scared that my mobo won't be able to. It's a Biostar A960D+ which isn't the best of boards
 

Danoded

Honorable
Dec 4, 2013
420
0
10,960


When the GPU Usage drops the FPS drops simultaneously rendering the game unplayable for around 20-30 seconds