All About Bitcoin and Litecoin mining and other alternative crypto currencies
SFARDS, the company formed after the merging Gridseed and WiiBox, has just announced that they have completed their new 28nm SF3301 dual-algorithm ASIC chip manufactured using the latest in FD-SOI processing technology and have released specifications about expected power usage and performance. The SF3301 is the claimed to be the world’s first chip to use this manufacturing process and is at the same time the first 28nm dual-algorithm (SHA-256 and Scrypt) chip, capable of mining these two algorithms simultaneously or separately.
According to SFARDS this technology allows for the ASIC chip to operate at lower voltage while maintaining a higher frequency resulting in better balance between power usage and performance. The SF3301 ASIC chip should have a lowest working voltage of only 0.45V with a BTC power efficiency at 0.19 J/GH, and LTC power efficiency at 1.75 J/MH (better than the initially announced numbers). With a reported performance for a single SF3301 chip for BTC with a hashrate of 152 GH/s, and LTC hashrate of 3.17 MH/s things may become interesting again for Scrypt miners, though it also depends on the price per chip. We are talking about a power consumption figures of about 90W per chip (152 GHS) in BTC mode and about 5.5W per chip (3.17 MHS) in LTC mode or supposedly in dual mining mode, for both BTC and LTC, a combined power usage of about 100W per chip. Now scale that to a 10 chip ASIC miner and you should get something like 1.5 THS BTC + 32 MHS LTC mining power with a 1000W power usage or a bit more…
SFARDS is apparently planning to release a number of documents for the SF3301 as open-source by the end of this month. The ASIC’s development board design and its software should also be published, and in May the design specifications for their debut Dual Miner solution is expected to be released. SFARDS will be selling ASIC development boards and sample chips, making the SF3301 accessible to developers who wish to customize and build their own hardware in the near future, though no mention of expected time frame is mentioned yet. No word yet on piring per chip or the miner or the number of chips we are going to see in the first upcoming miner.
Today we’ve been playing with the TechnoBit DICE Bitcoin ASIC miner to see what is the actual performance we are getting with the default settings as well as to see what is the overclock limit of the device. We were again on a quest to find out how exactly we should overclock the DICE from the options available in the cgminer config file as apparently the version provided for the DICE also contains settings for other ASIC miners, but the ones we need to tweak are the “hexminerr” settings as they are the ones for the 1-chip DICE as well as the other 4-chip RockerBox ASIC miner that TechnoBit has. Below you can find the description about the available options that are available as description.
Rocker (HEXR) new cgminer config options:
–hexminerr-asic-diff – Use at least 16 here and make sure your pool worker min difficulty is configured accordingly in order not to loose hash rate
–hexminerr-pic-roll – Default: 60 or 90. MicroChip PIC work internal roll count – Reduces dramatically USB load – Range 0-255. Please use at least 10 or 20 here
–hexminerr-chip-mask – 255 enable all chips
–hexminerr-voltage – core voltage Default: 690
–hexminerr-options chip_count:frequency – Default: 4:650
Apparently the description is referring to recommended values for the 4-chip miner as does the default settings in the config file set for the DICE version of cgminer provided by TechnoBit, though they will work with the single chip DICE as well. By default the values set in the config file are 720 mV (0.72V) for as voltage instead of the “default” 0.69V value and the operating frequency is 915 MHz. With these settings we’ve managed to see a hashrate of about 170-175 GHS as reported by cgminer and the mining pool averaged for a long period of time.
With the standard settings for operating frequency and voltage the DICE miner does manage to consume about 98.4W of power, though with some additional overclock the power usage does rise. Overclocking the device does take some time and effort as it seems that even though it may start running at a higher voltage and frequency that you set in a few minutes it may stop responding and you need to unplug and then plug the USB connector and restart the miner. IF you experience such a problem you might want to try increasing the pic-roll value a bit and see if that will help with the USB issue when working at a higher operating frequency. Do not that rising the pic-roll value may be just a temporary solution that will extend the time before the miner stops responding again. Some guidelines for overclocking, 1000 MHz should be possible with a voltage of about 0.74V with a power usage of about 115W and expected average hashrate of about 190 GHS. You may also try going for a maximum of up to about 1150 MHz with up to 0.8V that should get you at around 135W of power usage and expected hashrate in the range of 200-205 GHS, but be careful and try not to go for higher as it may be dangerous to try and push the miner more. Do note that your results may vary from unit to unit, also do note that the power usage values we cite here are for the actual power consumed by the miner on the 12V line and not the power usage at the wall. The total power usage measured at the wall may depend based on the power supply you are using and what efficiency it will have, but you need to add additional 10-20% to the cited figures to get the expected power usage at the wall.