Hi, i've just added Radeon HD 6870 to my system and downloaded the 11.10 CCC and installed it, and yet still testing it, but anyone would recommend the most stable CCC till now.
One thing i've noticed before in my 5770, that the version of CCC also effects the VGA Temp , dont know how but that's true for me!!!!!
If the version of CCC affected the temp of your vga, then you had a problem with that version, likely the 2d clocks were too high or too low, such as I had a problem with 11.7
There is no stable CCC for 6800 series, like cpu's, all graphics and ram chips are different, none are exactly the same and some will clock much higher than others while some will fail at a slight overclock.
That's why higher end cpu's and gpus are "binned". They choose the ones that perform the best with the least voltage and sell those as higher end often overclocked products.