When i'm mining on flypool eu the 290x shows in my rigs 320h/s and about 1,5% rejects but also like the others on the forum i get less profit then i should need to have on day payouts. Now i was trying to go to dwarfpool eu but when the miner begins i get 70% reject and on supernova eu i see in the miner that i get 30% rejects   i was mining 10minutes each. Do i need to undervolt my card to mine on dwarfpool or supernova? I'm now back on flypool for the moment.