After my filckering fail, which has only happened since installing my soundcard, im hoping was a coincidence. I have noticed that with crossfire enabled or disabled on any full screen game the fan goes to 100%, temp goes to around 107*C and then every now and again flickering occurs - but not right away, and becomes more frequent as your play.
Hoping this may be to do with card overheating.
So..... dismantled the card in its few stages to find a very lange clump of dust almost completely blocking the first heatsync...
http://i513.photobucket.com/albums/t...-21-125834.jpg
http://i513.photobucket.com/albums/t...-21-125843.jpg
Compared to the second heatsync down the card, with very little...
http://i513.photobucket.com/albums/t...-21-125907.jpg
Cleaned them both off and now its idling at around 58*C comapred to 80*C which is good.... will have to hope for the best and test in games now :)
And for any of you interested - this is waht a Powercolor 4870x2 looks like with no casing....
http://i513.photobucket.com/albums/t...-21-125941.jpg

