So i have a GT 635 that came with my Dell 8700 and while trying to overclock it I notice it jumping from its base clock of 900 all the way to 400 even when im not gaming and the temps. only at 30 degrees i went to GPU-Z to make sure and it shows the same jump from 900 to 400 what do i do to fix this problem please help i cant game with 400 clock speed