GTX 1080TI's x 8 units. But what are you planning to mine anyway? ETH? ETC? XMR? 
Perhaps with a coin I could've given a more 2 cents. 
Perhaps with a coin I could've given a more 2 cents. i only ever mine new or forgotten coins that are real easy with loads of blocks and coins ,that i stock pile until the next mad rush . i will not name any on here as everyone will pile on. you see i play the long game there's no get rich quick fix mining. my old rig has reached the end of it's life and need some advice on which cards i should get.