can HD-695x-CNFC and HD-695x-CDDC be crossfired together ?

[Rdk2ooo]

Not sure how much time the auction on eBay has left for the CNFC card but i currently have the CDDC and I was wondering if these 2 cards would be capable of being ran crossfired with little to no problems at all. The only thing I notice different of the 2 cards that has me concerned is that my CDDC is 830mhz where the CNFC is 800. Will I have to manually overclock the card of lesser speed up to 830 or would it do it on it's own ? Thanks !
Also, both cards are XFX brand 6950's.

 

[IDontUnderstand]

It will probably work, according to this discussion
http://www.tomshardware.com/answers/id-1651883/crossfire-identical-cards.html

I would manually overclock the speed so that both side matches