I recently put a 7790 in a machine with a 6670. The 13.4 and 13.5 drivers saw all the cards but if I went to any prior drivers the 7790 would not be seen. I'm using the 13.5 beta 2 drivers right now. I think the sdk in them is 2.8?
Also some other tests I just got done with. gpu0=hd7790, gpu1=hd6670
cgminer.exe -o
http://pit.deepbit.net:8332 -u homer -p simpson -k diablo
getwork pool NOT stratum (I suspected I was having issues with stratum)
1.6.2 unable to read kernel files?
2.0.2 ^^^
2.3.2 connect to pool then crash
2.6.4 works! int6 (diablo 279/105) gpu1 hw error
2.7.7 works! int6 (diablo 276/106) gpu1 hw error
2.8.3 works! int6 (diablo 275/106) gpu1 hw error
2.8.7 works! int6 (diablo 276/106) gpu1 hw error
2.9.4 works! int6 (diablo 275/106) gpu1 hw error
3.1.0 works! int6 (diablo 275/106)
3.1.1 connect to pool then crash
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cgminer.exe -o
http://127.0.0.1:10332 -u homer -p simpson --scrypt --thread-concurrency 4096 --worksize 64 -I 6
Was having more issues with scrypt than with the bitcoin mining.
1.6.2 no scrypt support
2.0.2 ^^^
2.3.2 ^^^
2.6.4 connect to pool then crash
2.7.7 ^^^
2.8.3 ^^^
2.8.7 connect odd behavoir
2.9.4 ^^^
3.1.0 connect odd behavoir, kinda works, disables gpu 1
3.1.1 connect to pool then crash
I have 7970's and 6950's in the same rig. I can give you my driver versions and everything if you are interested. That might get your 7xxx series and 6xxx series cards to work together.
Wait does the ^^^ mean that it works?
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damn. 
