Quote Originally Posted by Telo View Post
Are using Xfire? Did you set both card to the same GPU and RAM settings? For me, the only difference is that the card actually connected to the monitor runs a little warmer than the non populated one. I think you should use 1 card at time and test each in both slots to see if the performance is the same (that will show you what part is causing your issue).
Did all that & the cards & slots work perfectly on their own. I'll try running them at the same speed. there was just a minor diff higher on the slave (bottom).

Thought it might be a bois setting somewhere.

What are your 3dmark06 results? I'm around 18500.