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What Motherboard to Use for a Multi-GPU Mining Rig

21, Mar 2016

asrock-h81-pro-btc-motherboard

With the recent spike of interest in GPU mining thanks mostly to Ether a lot of people are getting back to building GPU mining rigs using more up-to date hardware much like back in the days of the Litecoin and prior to that of the Bitcoin mining boom. Nowadays it is much easier and you have way more options for different motherboards that have the option to work with 4, 5 or even 6 video cards by utilizing not only full width x16 PCI-E slots, but also the multiple available PCI-Express x1 sots with the help of extenders. We have prepared a list of all possible candidates for use as motherboards for multi-GPU mining rigs 4-6 GPU mining from ASRock, the company that has made its name among miners thanks to their dedicated BTC-branded motherboards made especially for GPU mining rigs. Other motherboard manufacturers such as Asus, Gigabyte, MSI and others also have products that might do for a multi-GPU mining rigs, but these are not dedicated for such use and this may cause some problems.

Nowadays ASRock has a lot of BTC-branded motherboards that are designed for use as multi-GPU mining rigs for different processor platforms from both AMD and Intel. There are also quite a few more non-BTC named motherboards that could do the job perfectly and some that might also work fine, but some of the PCI-E slots might not be available for GPU use under specific conditions, so you need to be careful. What is important for a motherboard that will be used with multiple GPUs for mining is for the motherboard to have enough PCI-E slots, to be affordable in terms of price as you don’t need extras targeted at gamers or enthusiasts and to be able to be used with cheap dual-core CPUs. ASRock’s BTC-branded motherboards do come with some extra features that may help by minimizing possible issues such as the fact that they have been designed to provide extra power to GPUs and have dedicated connectors for additional power from the PSU. They do not share PCI-E lanes with external hardware such as network controllers, audio cards, storage controllers or USB controllers that may cause problems if you want to use all of the available PCI-Express lanes for video cards and so on. These motherboards are offering just basic features, but ensure stable and problem free operation even under not so good conditions that often are available with GPU mining rigs that generate a lot of heat an may not be optimally cooled.

The list below covers all possibly suitable ASRock motherboards for 4-6 GPU mining rigs, you should choose to go for the models that do have the BTC in their model nae as they will most likely be the best choice. The next are Anniversary and Pro series and then the others if you have no other choice, but with such a big list you should have a lot of options. Unfortunately the only 6 GPU capable motherboards are for Intel socket 1155 and 1150 CPUs, still no affordable options for the latest Intel 1151 platforms or AMD FM2 sockets. Sure the company has some high-end enthusiast level products that can do 6 GPUs, but these are pointless for use as multi-GPU mining rigs as they will add to much to the price of the setup and you will be better off spending the extra cash for more video cards or more powerful models. After all you need to find the right balance that includes cheap motherboard, cheap processor and powerful GPUs along with some PCI-E extenders (powered preferably) with PCI Express x1-x16 USB 3.0 Extenders being the best choice if available.

Intel Socket 1151 ASRock Motherboards

5 cards:
– ASRock B150A-X1
– ASRock B150 Pro4D3
– ASRock B150 Pro43.1
– ASRock H170A-X1
– ASRock H170 Pro4
– ASRock H170 Pro4D3
– ASRock H170 Pro4S

4 cards:
– ASRock B150 Combo
– ASRock B150M Pro4S
– ASRock B150M Pro4
– ASRock Q170M vPro
– ASRock H170 Combo
– ASRock H170M Pro4S
– ASRock H170M Pro4

Intel Socket 1150 ASRock Motherboards

6 cards:
– ASRock H81 Pro BTC
– ASRock H81 Pro-G
– ASRock B85 Anniversary
– ASRock H97 Anniversary

4 cards:
– ASRock H81M BTC
– ASRock H81M-G
– ASRock B85M BTC
– ASRock B85 Pro4
– ASRock H87 Pro4

Intel Socket 1155 ASRock Motherboards

6 cards:
– ASRock H61 Pro BTC
– ASRock H61 Pro
– ASRock H61DEL

4 cards:
– ASRock H67DE3
– ASRock P67 Pro
– ASRock P67 Pro3 SE
– ASRock P75 Pro3

AMD FM2/FM2+ ASRock Motherboards

5 cards:
– ASRock FM2A58+ BTC
– ASRock FM2A58 Pro+
– ASRock FM2A78 Pro3+
– ASRock FM2A88X+ BTC
– ASRock FM2A88X Pro+ R2.0
– ASRock FM2A88X Pro+
– ASRock FM2A88X Pro3+

4 cards:
– ASRock FM2A58M+ BTC
– ASRock FM2A78 Pro4+
– ASRock FM2A88M+ BTC

Power Usage of Nvidia GPUs in Profitable to Mine Coins

6, Mar 2016

nvidia-power-usage-check

When calculating what crypto coin to mine you need to take into account not only the hashrate you get, but also the power usage for the specific algorithm used by the coin. When talking about Nvidia GPUs the two most popular ones used by miners are GTX 750 Ti and GTX 970 and there is a reason behind that – they offer good price/performance ratio to be used in multi-GPU mining rigs. Sure you can always go for a GTX 980 Ti or even GTX Titan X, but these although more powerful are also significantly more expensive and do not provide so good price/performance ratio.

We have decided to do a quick check of the current situation with a Geforce GTX 970 video card from Gigabyte (WF3OC) and a GeForce GTX 980 Ti reference design GPU and see how they compare in a power and performance check. The results you see in the table above are achieved with the latest ccMiner 1.7.4 from Tpruvot and with the latest fork of ethminer wth CUDA support from Genoil. The video cards are not overclocked further than their factory settings (the Gigabyte GTX 970 is factory overclocked) and they are forced to run CUDA applications in P0 power state to maximize performance in Ethereum.

As you can see from the results aside from Ethereum the GTX 980 Ti is faster with not that much more power usage, however the price of the 980 Ti is roughly double the price of a single GTX 970 and with two 970s you are sure to beat the hashrate of a single 980 Ti. It is interesting to see that a GTX 980 Ti (reference board) can be slower than a GTX 970 GPU, but with a non-reference design you can actually get about 20-21 MHS in Ethereum due to the higher clocks. Still the GTX 980 Ti is most definetly not the right video card for mining Ethereum, if you want to stick to mining Ethereum’s Ether coins with Nvidia you should go for the GTX 970 for sure as the best choice. Even though for Ethereum and other Dagger-Hashimoto altcoins AMD GPUs are still faster in terms of hashrate.

Monitor and Control Your Nvidia GPUs While Mining

2, Mar 2016

nvidia-smi-power-limit

There are a number of tools available that can allow you to monitor and control various aspects of your GPU and most fo them do come with nice graphical user interface to make things simple. When mining however you might want to have easy console command control over the GPU behavior to be able to execute commands that change things from a Batch file fro example right before a given miner software is stated. For Nvidia GPUs there is the Nvidia System Management Interface (nvidia-smi) command line utility that can help you do that in a simple and effective way, we have already showed an example using it to control the power state of the GPUs for getting some extra performance with non-overclocked video cards that are not running at the maximum power state when doing compute tasks such as mining for crypto currencies. Now it is time to show you some more useful tricks for using the nvidia-smi to check and modify the maximum TDP (Power Limit) that a given GPU can use as well as how to monitor constantly the GPU temperature and power usage and possibly log them in a file if you need that recorded for some further analysis.

The nvidia-smi utility is part of the video drivers and you can find it installed in the folder “C:\Program Files\NVIDIA Corporation\NVSMI\” on Windows, so you need to run the command line (cmd) and navigate to that folder in order to be able to issue commands. You then need to run nvidia-smi with some specific parameters based on what you need it to do such as specifying which GPU you need to play with by ID and then the command that needs to be sent or the data read from it.

So if you want to see what is the power limit of the first Nvidia GPU in the system:

nvidia-smi -i 0 --format=csv --query-gpu=power.limit

If you do not include the i parameter followed by the GPU ID you will get the power limit of all of the available video cards, respectively with a different number you get the details for the specified GPU. Then comes the fun part, changing the power limit to a lower value in order to reduce power consumption without affecting the performance or with slight decrease to get better power efficiency while mining. So in the following example we set the power limit to 175W for the first GPU down from the maximum of 275W that is has preset in the BIOS:

nvidia-smi -i 0 -pl 175

nvidia-smi-temperature-report

The next useful thing we want to be able to do via the console is to check the temperature of an Nvidia GPU and have it reported each second with the ability to also save the results in a text file should we need to do some additional analysis of the results. Using nvidia-smi to read the temperature of the first GPU each 1000 ms (1 second) can be done with the following command:

nvidia-smi -i 0 --loop-ms=1000 --format=csv,noheader --query-gpu=temperature.gpu

In order to stop the reporting of the temperature in degrees Celsius you need to press CTRL + C. If you need to have the result recorded to a text file you can run the following command:

nvidia-smi -i 0 --loop-ms=1000 --format=csv,noheader --query-gpu=temperature.gpu > temperature.txt

nvidia-smi-power-usage

The same way you can get the temperature of a GPU in the system reported you can also have a report on the current power draw of each Nvidia GPU in Watts for example every second. The reporting of power usage is very accurate and does not require any hardware as it is already implemented on a hardware level in the more recent Nvidia-based video cards. What you need to do is to run the following command:

nvidia-smi -i 0 --loop-ms=1000 --format=csv,noheader --query-gpu=power.draw

In order to stop the reporting of the temperature in degrees Celisus you need to press CTRL + C. If you need to have the result recorded to a text file you can run the following command:

nvidia-smi -i 0 --loop-ms=1000 --format=csv,noheader --query-gpu=power.draw > powerusage.txt

The reporting of the current power usage can be very helpful when tweaking your Nvidia-based video card for achieving the best power usage / mining performance ratio and also in order to compare power usage between different crypto algorithms. The nvidia-smi tool has some other useful features that may be handy for users, do note however that the changes you make with it are not permanent, they will need reapplying if you restart your computer, but you can automate them with a simple batch file by running a command right before you start up your miner software.


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