Anybody tried 6.2 with multiple Pascal cards?
Will try when I get home. With 6.1 I got about 30MH/s total for 4 1070s with latest drivers...
OP updated.
NVIDIA DRIVERS:
Windows 7 x64 is highly recommended for Nvidia cards, in Windows 10 often there is no way to get good hashrate because of buggy drivers.
9xx cards in Windows 7 x64: just use latest/recent drivers from Nvidia website (for example, 368.81).
10xx cards in Windows 7 x64 (read readme.txt there):
https://drive.google.com/open?id=0B69wv2iqszefQVRfOEhWS0FCdUE