HI
HD6930 1GB get 6 h/s only, it 50 times less by 390, it so small, but on XMR get 170 h/s, 4 times less 390, it normal
I tried Windows 10 with 15.7 and some 15.11 beta drivers. This is what I got:
5770 1GB 3.5 h/s
6970 1GB 5.5-6 h/s
6950 2GB 5.5-6 h/s
Only intensity 1 is supported on these cards. Maybe it's because the cpu was to slow, E6600 (2.4 GHz stock) and 4GB ram (ddr2 800 stock) ??
Later drivers didn't work:
16.9.1 support 6950/6970 but don't have OpenCL support
16.9.2 don't support 6950/6970.
16.11.4 don't support 6950/6970.
Maybe they work faster on Windows 7 or some other drivers combo.