Bitaxe Ultra 205 — Mining-Rentabilität
Überblick
The Bitaxe Ultra 205 is the entry point of the open-source Bitaxe family, released June 2023. It runs a single Bitmain BM1366 chip recovered from S19 XP hashboards — 0.4 TH/s at 30 J/TH on 12 W. Licensed under CERN-OHL-S-2.0 with full schematics, BOM, and firmware on GitHub (skot/bitaxe), the Ultra is the most accessible Bitaxe build: USB-C powered, sub-$130 hardware cost, no special cooling required. It is a sovereignty, education, and lottery participation device, not a profit-driven miner. Common deployments: home solo mining via public-pool.io or solo.ckpool.org, hackerspace and school workshops, and as a tangible counterweight to mining centralization. Within the Bitaxe lineup the Ultra sits below the Supra (0.7 TH/s) and the Gamma 601 (1.2 TH/s, 12.5 J/TH).
Glossar ansehen →Spezifikationen
Hashrate
0.4 TH/s
Leistung
12W
Effizienz
30 J/TH
Kühlung
Air
Veröffentlichung
June 2023
Hersteller
Bitaxe (open source)
Live-Rentabilität
Auswirkungen des Halvings 2028
The April 2028 halving cuts the block subsidy from 3.125 to 1.5625 BTC. For pool mining, daily revenue mechanically halves: ~$0 today, ~$0 post-halving. For solo lottery mining via solo.ckpool.org, the lottery odds themselves don't change — they are hashrate-relative — but the prize halves: 1.5625 BTC + transaction fees per block instead of 3.125 BTC + fees. At plausible BTC prices in the 2028 window ($80–120k), an Ultra 205 block hit still pays $125–190k — a life-changing event for a $130 hobby device. The Ultra's role as an educational kit and a sovereign participation tool is independent of the halving.
Halving-Countdown ansehen →Mit ähnlichen Modellen vergleichen
FutureBit Apollo II
9 TH/s · 22.2 J/TH · Air
Bitaxe Supra 401
0.7 TH/s · 21.4 J/TH · Air
Lucky Miner LV07
0.6 TH/s · 20 J/TH · Air
Häufig gestellte Fragen
What can I expect when running a Bitaxe Ultra 205?▾
Three layers, same shape as any Bitaxe: (1) Pool mining via public-pool.io: ~$0/day at the current hashprice — essentially symbolic. (2) Solo lottery mining via solo.ckpool.org: no daily payout, but a long-tail probability of a full block hit (3.125 BTC + fees today, ~$300k+ at current BTC price). (3) Educational and sovereignty value: a hands-on entry into the Bitcoin protocol stack, soldering and firmware tinkering, and a tangible vote against mining centralization. The Ultra is the cheapest way to participate; most owners run it for layer 3 with the lottery as a long-tail bonus.
What does it cost to run a Bitaxe Ultra 205?▾
Hardware: ~$130 retail, $80–110 second-hand or DIY. Electricity: 12 W × 24h × 365 days = 105 kWh/year. At $0.10/kWh that is $11/year, at $0.20/kWh $21/year. Network: any Wi-Fi or Ethernet connection. Cooling: a small heatsink, no fan needed for most builds. Total year-1 cost ~$140–155 — the cheapest Bitaxe to own and operate. Pool revenue covers a small fraction of electricity at retail rates; below $0.04/kWh you reach electricity break-even.
What are the real solo lottery odds with a Bitaxe Ultra 205?▾
Solo mining is a Poisson lottery: your chance of finding a block is your hashrate ÷ network hashrate, multiplied by 144 blocks/day. With the Ultra 205 at 0.4 TH/s against ~600 EH/s, that is ~0.0000096% per day, or ~0.0035% per year (1 in ~28,500). The mean time to a hit is ~28,500 years on average — that's the average, not a deadline; the Poisson tail leaves a non-zero chance any given month. Solo block hits with low-hashrate gear get reported on solo.ckpool.org and public-pool.io block feeds. The Ultra has the longest odds in the Bitaxe lineup; if maximizing solo lottery odds matters, the Gamma 601 (1.2 TH/s) is roughly 3× better.
How do I set up solo mining with a Bitaxe Ultra 205?▾
Flash AxeOS firmware (skot/esp-miner on GitHub) — most retail Ultras ship pre-flashed. Plug the USB-C cable in, connect via Wi-Fi or Ethernet through the AxeOS web setup. Configure your pool: stratum+tcp://solo.ckpool.org:3333 for true solo lottery (full block reward to you if your hashrate finds the block), or stratum+tcp://public-pool.io:21496 for low-fee solo-style pooled rewards. The username is your BTC address — that's where any reward lands. Save and the Ultra starts hashing within seconds. The AxeOS dashboard shows live hashrate, accepted shares, current network target, and chip temperature. Total setup time: ~5 minutes.
Bitaxe Ultra 205 vs Bitaxe Gamma 601 — should I upgrade?▾
The Gamma 601 delivers 1.2 TH/s at 12.5 J/TH (15 W) using the BM1370 chip from S21 Pro hashboards. Versus the Ultra 205 (0.4 TH/s, 30 J/TH, 12 W): three times the hashrate, ~2.4× better efficiency, marginally higher power draw. For solo lottery odds, the Gamma is dramatically better — ~3× higher probability per day. For a fresh build today, the Gamma 601 is the obvious pick. The Ultra remains relevant for budget-constrained beginners, classroom kits, and the smallest possible USB-C deployments. Both share the same firmware (esp-miner) and CERN-OHL-S-2.0 license.