Re: Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v11.4 (Windows/Linux)
Is it possible to set in the Claymore that these with Samsung memory give 31.3 Mh/s? 
No, you have to optimize their BIOS.
Look here, Hynix and Samsung covered with 580'ies:
http://1stminingrig.com/best-bios-rom-for-sapphire-rx-580-8gb-special-edition-hynix-memory-31-mhs/