So I have an update: firstly, you are correct that there are no X11 kernel mods for the R9 295x2. However, the R9 290X mod makes a great difference in performance. It has given me about 6-7Mh/s extra hashing power. I truly wonder what I could get with a dedicated kernel mod. Secondly, I started using xintensity 64 with 2 GPU threads in my config files. That has given me another 1-2Mh/s on average but has raised my rejects slightly. So I have some tweaking to do.  But at good times my miner info has shown up to 21.35Mh/s and I average above 17Mh/s.

As for my original inquiry, I am still waiting for my riser to arrive so I haven't put the other card in my computer. But I happened to get my friend interested in mining and we set his computer up with a 280X and 290X which are different chipsets. Sgminer creates a bin file for each card. So we only had to replace each file with the appropriate kernel mods. He is getting over 14Mh/s, up from 9Mh/s.

New Update:
I have the second card running in my machine now and it works flawlessly. Same procedure as with my friend's system but I am using a riser for the second card.

Both cards (Three GPU's) are mining stable with very little stales or errors. Using Xintensity 64, and gpu-threads 2 on both cards. sgminer minimum hashrates are: GPU0 8.614Mh/s, GPU1 8.661Mh/s and GPU2 2.4Mh/s.

Ok, so if I use two identical cards, I know I won't have an issue. Could it work with my original plan of the R7 265 and R9 295x2?

To get the speed increase, we replace the file created by sgminer with one for the model card being used. If I'm using two different models of cards; what happens?


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