Hi guys, i am a newbie in mining but after many hours of reading and working now I have fully functional rig RX 580 8Gb at 33 mh/s on ethereum.
But the problem is that I try to use a RX 580 4GB as second gpu but only get 4 mh/s.
I use an old PC with mobo Asrock conroexfire-esata2. I tried the 4GB card in all pciex sockets and also with usb riser on pciex 1x. Also tried the card with similar old mobo and same result but if I use 8GB i get 33 always. If I run mining with only the 4GB card on the mobo I get 20/21 mh/s
I have checked the pciexpress speed using lspci -vv and 5G/s result
I see many people here that gets more than 27 mh/s with RX5x0 cards.
I don´t know what more to do.