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Mining with a 8X GPU GeForce GTX TITAN X System

21, Jul 2015

nvidia-8x-titan-x

Here is something interesting that is not originally intended to be used as a GPU mining rig, but for a powerful compute oriented machine – an 8x GPU AsRock Rack Barebone populated with eight Nvidia GeForce GTX TITAN X video cards and two 14-core Intel Xeon processors. These powerful rackmount systems are designed for use with Nvidia Tesla cards for high-performance CUDA applications, but you can put in GeForce cards as well such as the TITAN X and have them all running at PCI-E 3.0 x16 speeds (no SLI support is available).

So we took one of these interesting systems and ran a quick test with the latest ccMiner to see what kind of performance we are going to get for crypto currency mining. It was out of curiosity as the system is not intended to be used for GPU mining – the whole things is just way too expensive to probably ever see ROI let alone make some profit from mining. Interestingly enough the 8x GPU configuration requires the use of Windows Server or compatible Linux distribution, with Windows 7 or 8.x we were having trouble making all 8 GPUs work properly (Error code 43 on the 8th card). Apparently there is a solution to make all 8 cards work fine under these consumer versions of Windows as well, all you need to do is some registry modification and you should be fine.

nvidia-8x-titan-x-performance

As you can see from the screenshot the system runs fine with a total hashrate of about 190 MHS mining Quark (98 MHS total on X11 and 25MHS total on Lyra2RE) on all eight GeForce GTX TITAN X GPUs. This means that a single TITAN X card gets you about 24 MHS for mining Quark-based crypto currencies and ll of the cards manage to provide optimum performance. Notice that the fans are turned all the way to 100% for best performance, because otherwise the cards are easily hitting the thermal limit with their fans running on auto at about 50-60% and as a result they throttle down and you loose performance with the GPU frequency dropping down to 1000 MHz. Again this is not a system designed for crypto currency mining, but for compute applications, we were just curious how well it will perform for crypto mining and it does a great job with some tweaking. Of course since the whole thing is designed to be in a server room the noise level is not relevant, though it is quite high as expected thanks to the 8 GPU fans and the other 8 chassis cooling fans that are 24W each when running at maximum RPM.

Maybe if GPU mining picks up to a large scale level like it is happening with Bitcoin mining and is profitable enough we might be able to see solutions like these used, but for now these are limited to businesses using them for high-performance CUDA applications. Think along the lines of 3D design, visual effects rendering, medical imaging, energy exploration or scientific simulations etc.

SFARDS With Preliminary Datasheet for SF3301 ASIC Chips

30, Apr 2015

sfards-sf3301-power-usage-hashrate

It seems that things at SFARDS are progressing well as the company has just released some documents including a datasheet for their upcoming SF3301 Bitcoin and Litecoin dual-mining ASIC chips. The documents include a preliminary power usage report on expected power usage in LTC and BTC mining modes that you can see on the image above. The numbers released in the above tables are higher than what we have anticipated based on previously released information about performance and power usage as the power efficiency numbers were apparently for too low operating voltages and frequencies that are going to be producing too low hashrates to be useable. Also it seems that SFARDS already has some sample chips and will announce pricing details on May 4th as was announced on their official Twitter account.

Official specifications of SFARDS SF3301:
– 160 BTC Units
– 31 LTC Units
– BTC mode up to 80 GH/s with 0.31 W/GH
– LTC mode up to 1.89 MH/s with 2.0 W/MH
– Dual-Mining mode: 100 GH/s BTC and 1.75 MH/s LTC
– Highly integrated with PLL and Pre-Calculation Engine of BTC
– 2-wires UART interface
– Support Crystal and Oscillator
– Fully adjustable clock frequency
– Support body-bias adjust
– On-chip thermal sensor

Based on the official specifications of the SF3301 Dual-Miner chip we are now looking at 100 GHS BTC and 1.75 MHS LTC mining performance per chip with expected power usage of just about 35W. And if we want to overclock it to get about 150 GHS with 3 MHS hashrates it would scale up to about 100W of power usage. Do note that these numbers and specifications are preliminary and are on per chip basis. If we make a 10-chip miner it could turn out to offer 1 THS Bitcoin hashrate and 17.5 MHS Litecoin combined hashrate with a power usage of about 350W which sounds like a pretty reasonable number. However overclocking this to get 1.5 THS and 30 MHS would scale the used power about 3 times all the way up to about 1 KW. So in the end it is going to be all about finding the best balance between hashrate provided and power usage with the maximum performance with overclock definitely not going to be the best option here, but then again the price of the hardware is also going to play a very important role here. People are already placing high hopes on the SF3301 ASIC chips to revive the interest in Litecoin and bring the price to a higher levels as mining for LTC resumes with a more up to date mining hardware that has better power efficiency.

– To check out the released technical documents at the official SFARDS GitHub page…

TechnoBit DICE Bitcoin ASIC Cooling Performance

27, Feb 2015

technobit-dice-noise-level-check

We are still playing with our hardware latest toy, the small TechnoBit DICE Bitcoin ASIC miner and today we were checking the cooling performance of the device. When we first saw the announcement the DICE was supposed to be a very silent miner as per the official specifications that stated (and still state) “Noise: ~20 DB at 25 °C ambient temperature”, however the moment we have turned on the unit a few days ago we knew this promise was not kept. If the noise level was just about 20 decibels than the DICE should’ve been so quiet that you would hardly know it is present and working in a quiet room. The reality is quite different though, our sound level meter has detected a noise level of almost 50 dBA and this is really quite noisy and a far cry from the promised noise. So we just had to take apart the device to see what fan it is using and also test to see if the case of the miner could be the culprit that is responsible for the very noisy operation of the DICE Bitcoin ASIC…

technobit-dice-top-bottom

When we have opened the case of the ASIC miner we’ve discovered that the cooling fan used inside is a 92mm Evercool EC9225M12CA, a mid range fan that does 2200 rpm with about 1.8W of power usage. Apparently the fan itself was sufficient to cool the miner with its 39.35 CFM of air flow and interestingly enough the specifications of the fan do say less than 25 dBA in terms of noise generated. The fan itself was directly soldered to the pins of the 6-pin PCI-E power connector on the unit, there is no thermal control or variable rpm, it is working at maximum all of the time. Running the miner without its metal casing has show us that it can be quite silent indeed, so the cause of the noise apparently was the metal case of the miner. More specifically the holes at the fan air intake that apparently are responsible for the significant increase of the noise level, so when TechnoBit has promised us a silent Bitcoin ASIC miner they should have modified the case of the device, so that it can really be silent and not the opposite – make a case that will increase the noise level way over what was promised in terms of specifications.

technobit-dice-side

The cooling of the single RockerBox ASIC chip that is at the heart of the DICE miner is sufficiently provided by two large aluminum heatsinks, one on top interfacing with a solid copper block to the ASIC chip and one at the bottom with direct contact to the whole surface of the PCB. There is enough thermal paste in between the heatsinks to provide good heat transfer and the not so powerful cooling fan has no trouble keeping the temperatures low, so that the about 100W of power used at the stock settings are not a problem. The device can also handle a nice boost in performance with some overclocking that is possible via parameters for the ASIC chip voltage and operating frequency, though you should be careful should you decide to clock the unit higher.

technobit-dice-thermal-image

In the end we take a look at the operating temperatures of the DICE with the help of a thermal imaging camera, the thermal image you see above shows how hot the top and bottom heatsinks get while the device is working normally. We are getting close to 60 degrees at the top heatsink and a bit over 40 at the bottom at the hottest sports, do note however that the operating temperature of the Bitcoin ASIC chip under the heatsink should be higher with something like 10-20 degrees Celsius over the temperature we have measured on the heatsink. So if you decide to overclock the miner you should proceed with caution and monitor the operating temperatures as the power usage increases along with the hashrate when you increase the operating voltage and frequency of the Bitcoin ASIC chip.


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