// blog · · by Nathan Baldwin
// The Gamma's BM1370 nearly doubles the Supra's hashrate at the same wall draw. Here's the head-to-head on speed, efficiency, heat, and real-world price.
If you’re choosing between a Bitaxe Supra and a Bitaxe Gamma right now, the short version is this: the Gamma’s BM1370 chip does roughly 1.1 TH/s at stock while the Supra’s BM1368 does about 0.7 TH/s, and they pull nearly the same power off the wall. The Gamma is the better miner on paper. But “better on paper” and “the right buy for you” aren’t always the same board, so here’s the full breakdown.
The Supra runs a single BM1368, the same ASIC family used in Bitmain’s S21 series. The Gamma runs the newer BM1370, the chip out of the S21 Pro. That one-generation gap is the whole story. Everything else on the boards — the ESP32-S3, the OLED, the 5V barrel jack, the AxeOS firmware — is close enough that you can ignore it for a buying decision.
At stock settings, a healthy BM1368 Supra lands around 625–775 GH/s depending on the chip bin, with most boards settling near 700 GH/s. A BM1370 Gamma lands around 1.0–1.2 TH/s, with 1.1 TH/s being a fair number to plan around. So you’re looking at roughly 55–60% more hashrate from the Gamma before you touch a single tuning setting.
Hashrate alone doesn’t pay the power bill, so look at J/TH (joules per terahash — lower is better).
A stock Gamma sits around 15 J/TH, pulling roughly 17–18W at the wall for its ~1.1 TH/s. A stock Supra sits around 17 J/TH, pulling roughly 12–15W for its ~0.7 TH/s. The Gamma is more efficient, but the gap is about 12–15%, not the 55% you see in raw hashrate.
That’s the part people miss. The BM1370 isn’t a massive efficiency leap over the BM1368 — it’s a modest one. What it really buys you is more hashrate packed into the same thermal and power envelope. If your goal is the most TH/s per box and per watt, the Gamma wins. If your goal is the lowest absolute power draw per board because you’re running several on one circuit, the Supra’s lower wattage per unit can actually matter.
Both boards dump their heat through a single heatsink and a 40mm fan, and both get warm under load. The Gamma runs hotter in absolute terms because it’s doing more work in the same footprint. Expect a stock Gamma’s ASIC to sit in the high 50s to mid 60s °C with decent airflow, and the Supra a few degrees cooler at stock for the same ambient.
The number that actually constrains you on either board is VR (voltage regulator) temperature, not ASIC temperature. The VR sits behind the chip and reads 15–20°C hotter than the die under sustained load, and it’s the part that goes unstable first when you push voltage. This is true on both boards, but it bites sooner on the Gamma because you have more headroom to chase and you’ll be tempted to use it. If you plan to overclock, budget for a small fan ducted at the VR side regardless of which board you pick. More on that in VR temperature matters more than ASIC temp.
This is where the Gamma pulls further ahead. A cooled BM1370 that won the silicon lottery can run 800–900 MHz, well past the 485–525 MHz stock range, and push toward 1.6–1.7 TH/s before efficiency falls apart. The voltage ceiling stays 1300 mV — that’s a Bitmain hard spec, and anything past roughly 1225 mV accelerates wear, so the practical limit is lower than the absolute one.
The Supra overclocks too, but the BM1368’s ceiling is lower and the returns thinner. You might take a 700 GH/s Supra to 850–900 GH/s with good cooling, which is a nice bump but nothing like the Gamma’s ceiling. If you’re the kind of person who enjoys tuning — and a lot of Bitaxe owners are — the Gamma simply gives you more to play with.
One thing worth saying plainly: chip bins vary. Two Gammas off the same shelf can land 15–20 mV apart at the same frequency. Don’t buy either board expecting to hit someone else’s screenshot numbers. Tune your own.
Street prices move, so check a current vendor before you commit. As a rough guide in mid-2026, Supras have been the cheaper entry point and Gammas command a premium for the extra hashrate. The relevant question isn’t the sticker — it’s dollars per TH/s. On that math the Gamma usually wins, because the hashrate premium tends to be smaller than the 55% performance gap. A Gamma that costs 25% more than a Supra but does 55% more work is the better value per terahash.
The exception is if you’re buying to learn rather than to maximize hashrate. A Supra is a perfectly good first board to understand AxeOS, pool config, tuning, and the rhythm of running a miner on your LAN. Nothing you learn on a Supra is wasted when you upgrade.
For a stock comparison at typical room temperature:
These are stock-ish numbers from publicly reported Bitaxe specs and community tuning logs. Your board will vary with chip bin, ambient temperature, and PSU quality.
If you want the most mining for your money and you enjoy tuning, buy the Gamma. The BM1370 is the better chip, the dollars-per-terahash usually favors it, and the overclock headroom is genuinely fun. If you’re running several boards on one circuit and care about absolute per-unit power, or you just want a cheaper board to learn on before committing, the Supra still earns its place.
Whichever you pick, do two things on day one: set a static DHCP lease for the board so you stop chasing its IP, and log hashrate and VR temp from the first hour so you can see drift over days instead of guessing. The board matters less than knowing what it’s actually doing.
Try it yourself: Bitaxe Baller is a free desktop app for Mac and Windows that surfaces these recommendations automatically across your fleet — live monitoring, tuning suggestions, pool config, all in a native window. Open source on GitHub.
