Thanks for the input guys, I can't believe how different it is now, I remember at the beginning of this thread everyone was after the hypers, people were even voiding warranty on expensive ram just to see what chips they had! I guess if no one wants them I should try and put them to use, is there any point in buying another set to get 8 gig? I mainly use my system for gaming so I hope my uses are not too out of place here!
I currently have my GTs at 7-7-7-24 @ 879MHz on my Crosshair IV Volts set to auto and it seems pretty happy NB @ 2856MHz.

What should be the max volts I give these with 'reasonable' case airflow cooling them? It would be cool if someone wanted a side project and could guide me on to see what we can get from these, I may as well try and get my monies worth

Thanks again.