It depends on what you are going to do, if you want to elaborate really what tool do you mean, if you are trying to build a mining tool I would just suggest that you just buy one of those ASICS ant miner in the market they are so much convenient for you and you can set it up by yourself. Less hassle on building and buying the stuffs that you want and it should be cheaper but it totally depends on you. I do think that the biggest problem on building a mining rig is the money because without it how will you get a high hash rate and if you just buy the cheap ones you won't get profit from it and instead you'll get negative plus the electricity cost and if you want to get a high speed internet. There are many con's and pros on building one but i do really prefer on just buying the pre build ant miner.