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 all three cards actually being used... you have to tell the program which gpu's to use on the command line... example...
clpts_x86-64.exe yourptsaddressheresoyougetpaid 0 1 2
the 0 1 2 tells it to use three graphics cards
0 = gpu 1
1 = gpu 2
2 = gpu 3
HOWEVER... if your video card is only 1GB, it will not work from what I understand, you need 2GB... is only one of your cards 2GB?