Quote from: Titigrominet on August 13, 2018, 08:43:31 AM

Hi guys ! In first, sorry about my english :-) (my own speaking is french)

I have two RX580 8gb nitro+ special edition, I have modified the bios, the driver installed is the crimson blockchain, I have disabled the crossfire mode in the radeon's software, I have overclocked too with MSI afterburner .. If I only use one card, the hashrate is 28 mh/s with claymore.

But,

If I use the two card in the same time in my computer, the hashrate is .. around 16 mh/s ..

I tried with claymore v 10.5 , 11.5 , 11.7 , 11.9 and it doesn't change anything...

Maybe you can know what is the problem ??

Thank you very much for your help !

are u using windows 7 or windows 10 ? why are you still using the outdated blockchain driver ?
use the recent radeon driver / windows 10 / switch your cards to compute mod with radeon settings , or with the tools tg88 mentioned earlier.

Quote from: tg88 on August 13, 2018, 02:43:44 PM

Try applying this tool and see if it solves:

https://bitcointalk.org/index.php?topic=2815803.0