Here are some numbers of my cards:
HD 7850: 930 cpm
HD 7950: 1815 cpm
R9 270: 1115 cpm
R9 270X: 1265 cpm
R9 290X: 2535 cpm
It's very strange that my 3x Asus 7850 could just run with about 700 cpm, even less than your one card. I tried new driver, it still doesn't work normally. Could you please help me find the solution? My English is not very good, hope you could understand me!
Are you overclocking? And more to the point is Schwede65? May be it is not a like comparison. I get 780 cpm on a standard 7850.
you didn't ask me directly - yeah, i'm overclocking as hell - all what the card does with msi-afterburner - not the voltage at the card
the cards are running cooler with NaN's-miner then scrypt-mining - using less energy (~70 - 75 % compared to scrypt-mining)
so - why not overclocking these little tiny cards, when they stay around 60 °C with 75 % fan-speed?
that gives more mined PTS:)
e.g. three 7850-gpu / 1150 core / 1400 memory (they came as a overclocked version 1000/1225/2GB)
1023 cpm + 1026 cpm + 1029 cpm