5970 different types?

[Madazam]

Hi,

New to bitcoin and thinking of making a bitcoin miner + home server kind of thing. The trouble is I have found some good 5970s used in my area but all are different types :

Saphire radeon hd 5970
Black edition 5970
Accelerator xtreme 5970

I am planning to make a miner with two cards.

My question is which one is better, out of the above for bitcoin mining. As per the wiki page average 5970 is 700 M/H.

Second, as per the vendor the above mentioned will not work concurrently/parallel on a machine, is that true ? and of its not which two will work together?

Thanks, in advance all.


Edit : just found out they will work. Dont need crossfire etc. Now which one is better....