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I would like to connect the following rig (please see the photos) to a blockchain platform (I prefer a platform which is simpler to use :) ). Maybe this rig would not be appropriate for Bitcoin, but also Ethereum or Zcash.

What steps do I need to proceed (step by step) to connect to Ethreum or Zcach?

Do I need to connect these devices to a personal computer?

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closed as too broad by RedGrittyBrick, Raghav Sood, chytrik, Andrew Chow Oct 7 '18 at 1:42

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What you have here are components for a rig. They are not "rigged" yet, ie, not connected, not structured to work yet. The main components for a mining rig such as you show are:

  1. PC motherboard (there seems to be one in the 3rd picture, the one with a large circular heatsink with fan & intel label) so this is in fact the core component of a 'Personal Computer - you already have it.
  2. Graphical Processing Units or GPU's (you have 4 Sapphire Radeon units of some model)
  3. Power Supply or Supplies (you show one, visible in the first 3 pictures)
  4. The frame to physically hold the components in place.

The bottom picture also shows a Raspberry Pi connected to a small relay board, which while not strictly necessary, would be used to help reset the rig (https://cryptomining-blog.com/tag/raspberry-pi-3-relay-control/)

Step-by-Step instructions would depend on exactly what blockchain you wanted to mine, and the exact models of the components you are using, but in essence, you run a computer (the PC motherboard or 'mainboard') which gives mining work to the GPU's (usually connected to the mainboard via PCI-e cables).
The mainboard will be running some mining software (cgminer, bfgminer or similar) on top of the OS (Linux or Windows usually) and "connecting to the blockchain" you mine by communicating with a mining pool, which itself is running a full node on the blockchain's P2P network.

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