Bitaxe 702 | 4.2 TH/s

The Bitaxe Supra Hex 702 is the Bitaxe for everyone who has outgrown a single ASIC. The board carries six BM1368 chips for a combined 4.2 TH/s – a good three times a single-chip model. Control still runs through the ESP32-S3 with AxeOS: no extra computer, no cloud in between. Power comes from a 12V/10A supply rated at 120 W.

Six chips mean six heat sources: the 702 works at around 90 W and relies on air cooling. In operation it is clearly audible – borderline for a desk depending on how sensitive you are, and a good fit for a study or utility room. At 90 W it adds up to roughly 65 kWh a month, so about €18.10 a month at €0.28/kWh. Efficiency lands at around 21.43 J/TH: the 702 wins through the number of chips, not through the chip generation.

In solo mining, every single hash counts as a ticket in the same draw the large mining farms take part in. If your 702 hits the valid block, the entire reward of currently 3.125 BTC plus that block’s transaction fees lands on the Bitcoin address you entered in AxeOS – no pool share. At 4.2 TH/s you hold more tickets per round than with an entry-level device, but that still does not make a hit likely: solo mining stays a lottery, not an income model. The tickets cost about €18.10 of electricity a month, and in between your hash rate confirms transactions and helps secure the Bitcoin network.

• Six ASICs instead of one: around 4.2 TH/s from a single device – one power supply, one Wi-Fi login, one dashboard instead of four devices side by side.
• 12 V platform: the supplied 12V/10A power supply provides 120 W and therefore keeps headroom over the roughly 90 W of operating load.
• Familiar operation: AxeOS is the same as on the small models – if you already run a Bitaxe, there is nothing new to learn.
• Open hardware: board design and firmware are published. Repairs, spare parts and community knowledge do not depend on a single vendor.

The 702 is air cooled. The waste heat of 90 W is spread across six chips but still has to go somewhere: the device belongs on an open surface with clearance to the back and above, not in a closed shelf compartment. The supplied stand sets it up accordingly.

How fast the fans spin is up to the fan curve in AxeOS: noise against a few degrees of ASIC temperature, in both directions. In summer, a cooler room is the most effective measure.

You need a socket, a 2.4 GHz Wi-Fi network, your pool credentials and a Bitcoin address; a smartphone is enough to open the interface. Every step is illustrated in the setup guide.

For home miners who already run a small Bitaxe and want to raise the hash rate considerably without opening a rack. For everyone who would rather manage one device with six chips than four devices each with its own power supply, Wi-Fi entry and firmware version. And for solo miners who want as many tickets per round as possible and knowingly accept the higher electricity bill.

It is less suitable if the device has to live in a living room or bedroom: 90 W need to be actively cooled away. If you want something quieter and more frugal, the Bitaxe GT is the better fit – 2.15 TH/s at 43 W from two newer-generation BM1370 chips. And if you only want to dip a toe in, the Bitaxe Gamma at 15 W and about €3 of electricity a month is the right place.

Miner, 12V/10A power supply, stand and quick start guide are included. From you come a socket, 2.4 GHz Wi-Fi and the decision about pool and address.

Power delivery matters more here than on a small Bitaxe: overloaded power strips or a replacement supply chosen without checking the data sheet are the most common cause of restarts under load.

The 702 is ready to use as delivered. Accessories pay off where the location reaches its limits or you extend your setup with your own infrastructure.

• Mining accessories for mounts, cables and small parts that keep the build tidy.
• Bitcoin nodes if you want to validate the blocks in the network yourself instead of only hashing.

The Bitaxe Supra Hex 702 is the right choice when you take the next step in open home mining: six ASICs, 4.2 TH/s, the AxeOS you already know and full control over pool and address.