Bitaxe Gamma GT Turbo review: two chips, and a fan to replace

You notice it straight away: the GT is bigger. It carries two BM1370 chips instead of one, the same family as in the Antminer S21 Pro. In theory that means about 2.2 to 2.4 TH/s depending on the version and settings, for a power draw that can reach about 50 W. A regular Gamma does 1.1 to 1.2 TH/s for 18 W.

Two chips also means twice the heat, so cooling moves from a 40 mm to a 60 mm format.

The GT drops the Gamma’s barrel jack for an XT30 connector, which is becoming common on desk miners. It comes from RC models (cars, planes, drones), where batteries and motors draw a lot of current. It handles high current reliably, and it is keyed: no way to plug it in backwards and fry the board.

Two buttons appear on the sides. Reset, on the left, restarts the ESP32, the machine’s small controller: handy if it hangs after an update. Boot, on the right, forces the ESP32 into flash mode, to reinstall the software if the machine no longer starts at all.

The USB-C port stays for updates and recovery, and the issue some computers had recognising it on other models is announced as fixed. Right next to it, the BAP (Bitaxe Accessory Port) reads temperature, hashrate and power, and can even drive the fan, frequency and voltage. The screen is the same as the Gamma’s.

Setup is the same as any Bitaxe. One trap, though: some units ship preset with a test address. If you do not change it, you are mining for someone else. Put yours in first. The settings to mine solo on my pool are in this guide.

On first boot, one thing surprised me: the noise. With factory settings the fan ran at 55%, the two chips at 51 and 55 °C, and it was very loud. I even had to lower the voltage to live with it, which defeats the point of a two-chip machine.

Maybe my fan was faulty, but other users report the same problem.

I swapped it for a 60 mm Noctua: about twenty euros, five minutes of work. The result, read in AxeOS:

The fan spins half as fast, you can barely hear it, and the machine gains 0.2 TH/s on the way. That is the rule with these machines: better cooling also means more stability, which matters as soon as you touch the settings.

These figures come from the interface, which ignores power supply losses. Even on that basis the GT runs at about 21 to 22 J/TH, where a Gamma is around 15: you pay for the hashrate in efficiency.

Some people push the GT past 3 TH/s. With the stock power supply I find that risky, so I did not do it for this review. If you want to try, start with the power supply and cooling, not the frequency.

At 2.28 TH/s, about 1 chance in 8,400 per year solo (network as of 17 October 2026). Twice a Gamma, and still a lottery. The full math: How much does a Bitaxe earn?

The fan swap is clearly worth it: about twenty euros for real quiet, better cooling and a bit more hashrate, while staying on sensible settings.

Get it if you want two Gammas’ worth of hashrate in one box and swapping a fan does not scare you. Skip it if you want a machine that is quiet out of the box, or the best efficiency: then look at the Thor X1.