HD6850 or GTX460 which is better for oclHashcat ?

[phoenixprime]

Hi and sorry if I'm hijacking the thread.

I'm thinking about getting a new or a pair of new graphic cards and I want to have OCLhashcat in mind when making the purchase.

Now, is there any specific value in the specs of a new card that I need to pay more attention to than others for the purpose of md5hasing?

Secondly is there generally a loss or gain in performance when using two cards that equals the power of one single card? or no difference?

I'm thinking about two 6870 cards, I have read some good reviews of them performing well in benchmarks game-wise.

Now I have a gtx480. Would two x 6870 outperform my gtx 480?

I dont think the answer is obvious, the price for two 6870 is just a little higher than that of a single gtx 480.

The 6870 as far as I understand is weaker than a 5870 but it's so much cheaper so I just thought I would ask for an opinion from the forum on this pretty nice card speaking performance / price.

TY