- 1.7 TH/s max hashrate tops its nearest rival, the AntMiner S5
Costs just $110, can be purchased on eBay or Amazon
Quiet at low speeds, generating ~52 dB from 1 meter
Spondoolies co. has closed, meaning limited availability & support
The unit runs quite hot, especially at higher speed
At 0.9W/GH, its efficiency is poor compared to the S5’s 0.25W/GH
Spondoolies unfortunately shut down on May 4th 2016. In late 2014, they released the SP20.
Spondoolies crammed a total of eight 28nm RockerBox ASIC mining chips onto 2 circuit boards within a compact form factor.
The SP20 is a neat miner, powerful for its low price with a size and noise level suitable for home miners.
The major drawback is its relative inefficiency. The SP20 draws a lot of power for its hashrate, which is low by modern standards.
Any ATX PSU of sufficient wattage (1200W+) will run the SP20 without problems.
In keeping with the SP20’s flexible design, you may also use dual lower wattage (750W+) PSUs to replace a single powerful PSU.
Bitcoins mining Profitability
Unless you have free electricity, it’s highly unlikely the SP20 will ever pay for itself, never mind make a profit.
The SP20’s 120mm fan is quieter than the models in either the SP10 or SP30 models. Although it get noisier the faster and hotter the SP20 runs, it’s quiet enough to run in a home.
Spondoolies’ user interface provides all the configuration settings and monitoring information you’re likely to need.
The SP20 simplicity itself to setup. The GUI displays temperatures and hashrate for each individual chip, plus other vital info.
You can even use it to adjust voltages (within reason) on the board, to find that sweet spot between hashrate, power and heat.
The SP20 connects via Ethernet only.
This unit should be operated in environments below 35^C / 95^F. Due to its high power consumption, it generates a lot of heat.
At high processing speeds, the heat will cause the fan to become much louder.
The Spondoolies SP20 was a great mining device in its day. With the Bitcoin network’s current Difficulty, it no longer makes economic sense to run an SP20 given its low efficiency.
The AntMiner S5 is far more power-efficient and costs around the same.While more expensive, the Antminer S7 and Antminer S9 (or even the R4) both offer much more efficiency.