fyi I tried kminer-1.2b miner referenced in this thread

My system Windows 8.1 running Cat 13.12 drivers, cpu 1 core sempron 145
3 x 7970 PowerColor cards with Stilt mod bios running 1080/1500

kminer-1.2b give 1627h h/s at 600 watts, dev fee 0.7%
vs
claymore 8 cat 13.12 1620 h/s using 650 watts. dev fee 5%

So kminer1.2b and Claymore 8 are just about the same at mining speed, but dev fee is lower 0.7% vs 5% and uses 50 watts less on my rig.

Nice to see some competition