Two main elements must be taken into account when choosing mining hardware. Hash rate, it is the number of calculations that your hardware can perform every second when trying to solve the mathematical problem. Hash rates are measured in megahashes, gigahashes, and terahashes per second (MH/s, GH/s, and TH/s.) The higher your hash rate (compared to the current average hash rate), the more chances you have to solve a transaction block. All that computing power is power hungry, and it costs money. When making your hardware choice, it’s worth looking at the power consumption of your equipment in watts. You want to make sure that you do not end up spending all your money on electricity to extract coins that are not worth what you paid for. Use these two factors to determine the number of hashes you get for each watt of electricity you use. To do this, divide the number of hashes by the number of watts. The least powerful category of Bitcoin mining equipment is your computer itself. Theoretically, you could use your computer’s processor to look for bitcoins, but in practice it’s so slow by today’s standards that there’s no reason. You can improve your bitcoin hash rate by adding graphics hardware to your desktop. Graphics cards include graphics processing units (GPUs). These are designed for heavy mathematical calculations in order to compute all the complex polygons required for high-end video games. This makes them particularly talented for the SHA hash mathematics needed to solve transaction blocks. GPU mining is largely dead these days. The difficulty of exploiting Bitcoin has accelerated so much with the release of ASIC mining hardware that graphics cards can not compete. If you want to use them, you’d better get a multi-card motherboard to save on running different PSUs for different cards.