Its nothing to worry about. The thing is your using funny drivers (not extremely good ones i might add) and these drivers are unlocking developer and debugging tools that are otherwise hidden. The 6800 does a numbers of things in the background, stress testing itself, purging the frame buffer, speeding fan up and slowing fan down on order to make sure the thermal probe is working. This is just another one of the procedures the card follows on a daily basis. What troubles be is that you have water cooling on that card. This isnt a great idea on 6800s as the GPU isnt the only part of the card needing cooling. When the stock cooler is on, air flows through the heatsink, and over the fins on the PWM area of the 6800. When watercooling with a card like the 6800, or even the 5900, you MUST cool the rest of the card to some degree, probably a very low rpm 80mm fan blowing over the heatsinks on the rear of the card (i mean near the external power connector), failure to do so will result in an unstable card over time, and ultimately a dead card. make sure you take this into account.
