I got a 7870 xt so I thought I would try some overclocking because this card is apparently good for it from what I have read. The default clock speed is 975 so I boosted it to 1200 which is the speed they used for an overclocking review I read. I used MSI afterburner to monitor my speed, temps, etc. and the speed keeps jumping from the default to what I have set over and over. Is this normal? Is it supposed to stay set to 1200? I am using amd overdrive to overclock. I tried googling for an answer and couldnt find anything.