If you are interested in Cloud Mining, you can check this = My Best Bitcoin Cloud Mining Companies|services To Invest In 2017
This review is extracted from 99bitcoins.com
Bitcoin Miner Review: The AvalonMiner 721 (Avalon 7) – Is it Worth it?
In a very unusual move, Avalon, the company that first introduced ASIC chips to Bitcoin mining has released a new miner to the market. The AvalonMiner 721 (or more commonly known as Avalon 7) seems to be a minor upgrade from its predecessor, the Avalon 6.
The Bitcoin miner comes with 6 TH/s of mining power and a power consumption of 850-1000 WATTS. This makes it stronger and more efficient than the Avalon 6. However, when you compare it to the most popular miner on the market, the Antminer S9, it seems to be lagging behind.
AvalonMiner 721 includes a 90-day warranty, starting from the date goods are received. Here are the complete specs of the miner:
Hashrate: 6 TH/savalon7
Power Consumption: ≈ 850-1000 Watts
PSU output pins: 8 x 6PIN PCIe power connectors.
Controller: AvalonMiner Controller
AUC3: Each AUC may connect up to 5 devices.
Dimensions: 340 mm x 136 mm x 150 mm
Gross Dimensions: 400 mm x 210 mm x 220 mm
Operating Temperature: -5 °C to 40°C
Net weight: 4.3 kg
Gross weight: 4.7 kg
You can also connect an AvalonMiner controller in order to hook up 5 different Avalon miners together (giving you a total mining power of 30 TH/s).