GPU Usage & Clock Fluctuation

[Roly2408]

I’ve recently upgrades from a GTX560tI to a Gigabyte Windforce 3.

I have got the version with the following setting out of the box:-

Core Voltage: 1125
Core Clock: 1000MHz
Memory ClockL 1250

When I use Afterburner to monitor the FPS, I seem to be having a problem in Far Cry 3 and some of my other games the Core Clock & GPU usage start to fluctuate after about 2 minutes of playing.

I'm new to AMD cards, and I'm wondering is this normal, or is there a problem with the card?

 

[Roly2408]

The temps only go to 60 degrees.

I'll try GPU-Z and see if I get a different result.

 

[Roly2408]

Using GPUz the clocks are stable. Guess it is the problem with afterburner.
Does any recommend any other programs for monitoring the graphics card usage?