Unlike in Proof-of-Work (PoW) systems, DFINITY does not require your machines to solve any puzzles. All the computational power of the network is used for actual transactions. As Proof-of-Stake is in itself a much less demanding process, the energy saving is substantial.
DFINITY does not require any GPUs or special chips to mine. This way you can use the hardware you already have to contribute to the network.
Hardware specs of your servers
Number of servers you are willing to use for DFINITY node creation.
Location of servers