Overclocking in crossfire.. quick questions

Hi,

I currently have two sapphire 4850's running in crossfire, however one overclocks higher than the other...

Card A (my secondary card) runs at a max of 700mhz/1150mhz however
Card B (my primary card) runs at a max of 730/1220mhz...


I have overclocked them in rivatuner 2.20, have taken them out and switched them over and ATI Tool'd, because ATI tool will only test primary card, and they are both 20mins+ stable.. When I view the cards in GPU-Z they show at there individual clocked speeds as mentioned above but in CCC the main card shows as stock GPU but o'ced memory and the secondary card shows at it's settings above, crossfire is enabled etc in CCC etc... So...

1) Can you run two cards at different speeds in crossfire? am I actually getting 730/1220 + 700/1150 or is something I don't know about restricting this?
2) Why is CCC showing incorrect speed?
3) who do i trust GPU-Z or CCC?
4) Is GPU-Z correct? is there any other way of looking or checking there each individually running at correct o'c settings?
5) Is there any software/game you can run so I can view the load on both cards?

Thanks in advance!
Alex.