First a pair of holders were constructed out of commercial grade cardboard to suspend the graphics cards above the motherboard with spacing for airflow and the PCI-Express risers that connect the cards to the various slots on the motherboard. Windows 7 is chosen as the operating system using guiminer for mining. best graphics cards for bitcoin mining – 2x Intel Celeron Ivy Bridge 2.
VGA adapter plugs as are commonly seen in the mining world and instead poke the resistors directly into the graphics card itself. By unscrewing one of the riser screws on the DVI port it is possible to secure the grounding side of the resistors ensuring the resistors will never shake loose on their own. Watt power supply that is capable of running both the host PC and the cards themselves. Watts of reliable power for powering up to 4 graphics cards apiece.
First the top cover of the power supply is removed, these were designed to have air pushed through from one end to the other. Here you also see the modular power connector these use, by using the appropriate mating connector we achieve a swappable power system where if a power supply dies it can be swapped out for 4 cards in less than 20 seconds. A fan assembly is then constructed that suspends 8x 92mm fans above the power supplies pushing a tsunami of air down onto the heatsinks and other components in the opened power supplies. A total of 5 power supplies will fit under one length of 4 fans stacked side-by-side, 5 power supplies will provide enough power for 4 mining rigs worth of graphics cards or 20 cards total over 5 power supplies.
8 online or cheaper depending on bulk. The pinout is somewhat complex however the pins we are interested in are easy to find and once connected together will turn on the power supply and instruct it to output its full power. You can either use a switch between the two wires shown in the pictures below or connect them permanently. You can then connect several units on a power strip and use the power switch on that to turn the units on and off. At this point your main power leads to the graphics cards can be soldered to your mating connector with respect to the output pins.
The 12v and ground pins are grouped in sets of 3 with a total of 8 pins representing each contact. Wires can be soldered in between the two by four sets of pins to ensure even electrical contact and also make things easier to wire up. The mating connector can be found under the part number G20F203000HR-ND and is made by Amphenol Commercial Products. A quick google search results in quite a few sources of this particular component. The molex ends of the adapter plugs are cut off and the wires stripped and connected together in groups of 4 plugs or 8 wires in each bunch. It seems like a lot of wires to just twist together but an important factor to keep in mind here is that the specifications for providing power to most graphics cards provides far more than is necessary. The result is that you will end up burning up the ATX power socket or worse burning a trace or other component on your motherboard.
Overcoming this issue is simple and involves a simple modification to the PCI-Express riser cables. The generally accepted way of performing this mod is to cut back 5 of the wires that run from the riser to the motherboard. These are then stripped, twisted together, and soldered to a length of power wire. A total of 4 of these risers can be safely powered from an atx12v connector with the remaining card using an unmodified PCI-Express riser which draws power from the motherboard. Pioneering a new method I decided to simply create a small cut or breakage in the 5 wires from the motherboard to the riser and then soldering the power wire directly to the riser’s PCI-Express socket. This has the advantage of not trying to send high current through weak ribbon cable and providing a more secure connection point for the wire allowing the riser to stand up to more abuse.
It’s not evident to the novice miner that even though power graphics cards have ports designed specifically for the large amount of current they draw that a small portion of that power will also be drawn from the PCI-Express slot. If you have indeed fried a trace on your motherboard it will be necessary to create a bypass of that trace. Luckily on this motherboard the trace ran along a single edge and was easily bypassed by first trimming the burned portion of the trace and exposing some of the intact copper trace at either end. Once secured we can be sure that at least for this portion of the trace the issue will be completely fixed. You can’t have Bitcoin without mining. Even if you have gotten your head around what cryptocurrencies like Bitcoin actually are, you’d be forgiven for wondering what Bitcoin mining is all about. It’s far removed from the average Bitcoin owner these days, but that doesn’t change how important it is.
It’s the process that helps the cryptocurrency function as intended and what continues to introduce new Bitcoins to digital wallets all over the world. It’s the process by which transactions conducted with Bitcoin are added to the public ledger. It’s a method of interacting with the blockchain that Bitcoin is built upon and for those that take part in the computationally complicated activity, there are Bitcoin tokens to be earned. Want to learn all about altcoins like Litecoin, or Ethereum? We have guides for those too. The basics of mining Cryptocurrency mining in general, and specifically Bitcoin, can be a complicated topic.
Mining is a risky process though. It not only takes heavy lifting from the mining chips themselves, but boatloads of electricity, powerful cooling, and a strong network connection. The reward at the end isn’t even guaranteed, so it should never be entered into lightly. Bitcoin works differently from traditional currencies. Where dollars and pounds are handled by banks and financial institutions which collectively confirm when transactions occur, Bitcoin operates on the basis of a public ledger system. In order for transactions to be confirmed — to avoid the same Bitcoin from being spent twice, for example — a number of Bitcoin nodes, operated by miners around the world, need to give it their seal of approval.