Despite the fact that you can use the familiar to us computer accessories to create a farm, the design must take into account a number of conditions, from the performance of which will depend the final functionality of your computer system for the producing of coins, as well as its reliability, stability and ease of maintenance.
The main feature of such systems is that instead of a single video card they have several – from three to six. The presence of a large number of video cards imposes special requirements to the power unit. It needs to provide the necessary supply of the electricity to supply all the chips.
Video cards all the time will work at maximum load, so the power of the supply unit must be equal to the maximum total consumption of all the chips plus 20% of the reserve to the power supply unit won’t be working at the limit of its capabilities.
When choosing a power supply unit you should pay attention not to its general capacity, but on capacity on the line +12V which is used by video cards. Ideally, if the unit will have somewhat independent from each other lines PCI-E.
If you plan to collect farm for the bitcoin mining which will have four chips and more, it is hardly possible to find a supply unit with a capacity of 1200-1500 watts in a computer store, and even with the right number of lines and wires to connect all of the cards. In this case it is cheaper and easier to buy two power supplies of smaller volume and connecting them in parallel.
To connect video chips use special adapters and cables PCI-E – so-called riser cables.