Great answer

so I will try to sell this mobo :p

today I didn't made the choice of the amd card but if you said it'll be better with 380 I'll search information & analyse this choice

So I'll schedule by this configuration :
    ASRock H81 PRO BTC Carte mère Intel ATX Socket LGA1150
    Kingston KVR16N11S8/4 4GB 1Rx8 512M x 64-Bit PC3-12800 CL11 240-Pin DIMM Value Mémoire RAM DDR3 1600MHz
    Intel Haswell Processeur Celeron G1820 2.7 GHz 2Mo Cache Socket 1150 Boîte (BX80646G1820)


    Lepa MaxPlatinum Alimentation pour PC 1700 W !!!!
http://www.amazon.fr/gp/product/B00J1UCW24/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=A1X6FK5RDHNB96
    MENGS® PCI-E 1x Express16x Adaptateur carte Riser Expansion Propulsé câble USB 3.0 pour Bitcoin Mining !!!
http://www.amazon.fr/gp/product/B00J1UCW24/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=A1X6FK5RDHNB96

Which version / model for r9 380 ?? Sapphire ??
https://www.amazon.fr/Sapphire-Nitro-Carte-graphique-Express/dp/B016EY8JMG/ref=sr_1_1?ie=UTF8&qid=1460286347&sr=8-1&keywords=r9+380

thank you for you help