Mixing 6xxx and 7xxx gpus to mine?

[cloudp]

I have a 7870 and have an opportunity to pick up a 6950 up for cheap. Will there be any issues with mixing these two cards?

[ub3rCoin]

I had extreme difficulty trying to get my 7950 and 6870 to work.
I had massive driver issues then just gave up.

Eagerly awaiting any answers..

[cloudp]

Yeah. I only ask because I have been using a 7870xt, but had an extra 6670 laying around so i threw it in. I can get it to start hashing out, but it never picks up any shares. Could be the the card itself.. could be the mix of 6 and 7 series gpus.. idk