NerdOCTAxe Guide
The NerdOCTAxe is what happens when the open-source mining community stops being polite about hashrate: eight Antminer-class chips on one desktop board, up to 12 terahash, still quiet enough for an office. It is the most powerful open-source Wi-Fi miner you can buy — and also the most confusingly sold, with revisions, phase counts, and 'Titan' branding muddying every listing. This guide untangles all of it: every version, the 4-vs-6 VRM question answered properly, and what twelve terahash can honestly win.
The NerdOCTAxe is the most powerful fully open-source home Bitcoin miner on the market: eight Bitmain BM1370 chips — Antminer S21 Pro silicon — on a single desktop board, delivering roughly 9.6 TH/s at stock settings and up to 12 TH/s tuned, at 160~240 watts and quiet-PC noise levels. “Octa” is the eight chips; the confusion is everything else — Rev 2.2 versus Rev 3.1, four versus six VRM phases, and “Titan” listings charging extra for free settings. This guide is the untangling, plus the number every buyer actually wants: what twelve terahash can win.
Key takeaways
- Top of the open-source ladder: ~60% more hashrate than a NerdQAxe++ from twice the chips, at ~15.8 J/TH on Rev 3.1 — industrial-class efficiency on a bookshelf, around $106/TH, the best value in open hardware.
- Rev 3.1 is the one to buy, and the reason is the VRM: six power phases with the TPS53667 controller instead of the older four-phase design — a third less current per phase, less heat, less ripple, more overclock headroom. It’s what makes sustained 12 TH/s stable.
- ”Titan” is a label, not a product. It’s a standard Rev 3.1 shipped pre-overclocked; the identical 12 TH/s is two free settings away in AxeOS on any Rev 3.1. Pay for hardware and bundles, never for the name.
- 9.6 and 12 TH/s are the same board at different clocks (~160 W vs ~200~240 W). You choose the operating point yourself — buy on revision and price.
- The honest solo math (July 2026, @ 12 TH/s): ~1-in-1,518 per year on Bitcoin; ~5.7 years expected on BCH; and on the smallest SHA-256 chains, an expected block roughly every six days.
The origin story: El Ocho
The Nerd*axe family is a largely European open-source lineage, community-built under the Open Source Miners United (OSMU) banner: BitMaker’s original single-chip NerdAxe begat the quad-chip NerdQAxe+ (4× BM1368) and then the NerdQAxe++ (4× BM1370). The NerdOCTAxe — project name “El Ocho” — doubled down: the original eight-chip design by community developer Pual91, later refined into Rev 3.1 by BitMaker at Bitronics, who redesigned the entire power delivery system. Every schematic and firmware line is public, which is why multiple manufacturers sell it, why the community documents its weaknesses openly, and why the revision history below exists at all. It runs a dedicated ESP-Miner fork on the familiar LilyGO T-Display S3 color screen, with the AxeOS web dashboard handling pools, tuning, and monitoring — the same daily experience as its smaller siblings, scaled up.
Every version on sale: the complete revision guide
| Version | Typical config | What changed | Verdict today |
|---|---|---|---|
| Original / Rev 2.x | ~9.6~11.4 TH/s @ ~160 W stock (~700 MHz) | Established the eight-chip BM1370 platform on a four-phase VRM. Community overclocks reached 10.8 TH/s at 157 W (14.5 J/TH), but sustained high clocks pushed the four regulators’ thermal limits | Capable at stock; the used-market option |
| Rev 3.1 (Gamma) | ~9.6~11.4 TH/s @ ~160 W stock · ~12 TH/s @ 200~240 W tuned | Six-phase VRM with TPS53667 controller, stronger 12V routing, improved decoupling and grounding, upgraded XT60 high-current connector, large rear VRM heatsink, dual/quad-fan cooling options — VRM temps down ~30% in updated builds | The one to buy — cooler, more stable, more headroom |
| ”Titan” listings | ~12 TH/s @ ~230 W out of the box | A standard Rev 3.1 with overclocked firmware pre-applied and sometimes upgraded cooling. Identical PCB, chips, and capability | Fine hardware — just refuse the branding markup |
| Vendor builds | Varies: 12V/18~20A PSU, fan counts, stands, Wi-Fi/Ethernet options | Same Rev 3.1 platform with different bundles and factory clocks | Compare what’s in the box, not the headline TH/s |
The 4-phase vs 6-phase VRM question, answered properly
Since this is the spec that actually separates the revisions, it deserves a real explanation. A VRM (voltage regulator module) converts your 12 V input down to the ~1.2 V the ASICs drink, and it does so through parallel phases — independent regulator circuits sharing the load. Eight BM1370s at full clock pull serious current, and that current divided by four phases versus six is the whole story: with six, each phase carries a third less current, which means quadratically less resistive heat in every component, smaller voltage ripple reaching the chips, more even thermal distribution across the board, and a wider margin before anything approaches its limits.
The consequences cascade exactly as the community measured: the four-phase Rev 2.x could hit high clocks but ran its regulators hot doing it; Rev 3.1’s six phases plus the TPS53667 controller (the same caliber of power design found in premium PC motherboards) hold the chips at stable voltage through sustained 12 TH/s operation, in warm rooms, without throttling. This is also why cooling bundles matter more on the OCTAxe than on any smaller Nerd*axe: eight chips plus six regulators is real thermal work, and the Rev 3.1 builds with the big rear VRM heatsink and improved fan layouts run their key components dramatically cooler. If you remember one sentence when comparing listings: the phase count is the revision — everything else is a bundle.
The question that matters: what can 12 TH/s actually win?
Live difficulties, July 2026 — shown at the tuned 12 TH/s operating point (scale by ¾ for stock ~9.6):
| Chain | Expected time @ 12 TH/s | @ 9.6 TH/s stock |
|---|---|---|
| BTC | ~1,518 years (1-in-1,518/yr) | ~1,898 years |
| BCH | ~5.7 years | ~7.1 years |
| BC2 | ~73 days | ~91 days |
| XEC | ~27 days | ~34 days |
| BCH2 | ~6 days | ~8 days |
Twelve terahash is where the ladder starts feeling different. The Bitcoin ticket doubles a NerdQAxe++‘s to a genuine 1-in-1,500 per year — the hashrate class with documented home wins, most famously the ~6 TH/s setup that took block #920,440 in October 2025 for 3.141 BTC. BCH at ~5.7 years crosses into “plausible within the hardware’s lifetime” territory. And the bottom rows turn the OCTAxe into a machine that expects weekly wins — smaller prizes, thinner liquidity, all priced honestly in the ladder comparison, with the variance reality in the Poisson guide. As ever: same board, one URL between lotteries.
Verdict: who should buy it
Buy a Rev 3.1 if you want maximum open-source hashrate in one quiet box: it’s the current king of the category, the six-phase power design is genuinely well-engineered, and at ~$106/TH it’s the best odds-per-dollar in open hardware. Prefer stock clocks for silence and peak efficiency (~15.8 J/TH), or take the free trip to 12 TH/s when winter justifies the watts.
Skip it if this is your first miner (start with a Bitaxe or NerdQAxe++ — same ecosystem, gentler commitment), if redundancy matters more than footprint (two QAxe++ units split the risk), or if your ambitions have already outgrown the desk — at which point the 90 TH/s home-tower class is the next honest conversation. And in every case: refuse the Titan tax, check the phase count, and choose the chain as deliberately as the board.
Eight chips. Five lotteries.
Point your NerdOCTAxe at SoloFury and choose its game: Bitcoin’s 1-in-1,500 yearly ticket, or chains where 12 TH/s expects a block every week. Non-custodial coinbase payouts, 1% fee, TLS endpoints in every region, lifetime best-share tracking per worker. El Ocho deserves a worthy hunt.
Your exact odds at 12 TH/s →Point it at a chain →Frequently Asked Questions
What is the difference between the NerdOCTAxe Rev 2.2 and Rev 3.1?
The power delivery system. Rev 2.2 established the eight-chip BM1370 platform with a four-phase voltage regulator; Rev 3.1 upgrades to a six-phase VRM with the TPS53667 controller, plus stronger 12V routing, improved decoupling and grounding, and an upgraded XT60 power connector. Both hash similarly at stock — the difference appears under sustained load and overclocking, where Rev 3.1 runs cooler and more stable.
Why do 6 VRM phases matter versus 4?
Each phase shares the total current feeding the eight ASICs. With six phases instead of four, per-phase current drops by a third — meaning less heat in every regulator, less voltage ripple reaching the chips, more even load distribution, and more thermal headroom before anything throttles. That's what unlocks Rev 3.1's stable 12 TH/s operation; it's the same engineering logic as premium PC motherboard power design.
Is the NerdOCTAxe 'Titan' a different or better miner?
No — and this matters for your wallet. 'Titan' is a marketing name some sellers apply to a standard Rev 3.1 that ships with overclocked firmware settings (~12 TH/s at ~230 W) and sometimes upgraded cooling. The PCB, chips, and capability are identical to every other Rev 3.1; you can reach the same 12 TH/s yourself by changing two settings in the free AxeOS dashboard. Never pay a premium for the label.
Is the NerdOCTAxe 9.6 TH/s or 12 TH/s?
Both numbers describe the same hardware at different clocks. Stock firmware settings (~700 MHz) yield roughly 9.6–11.4 TH/s at ~160 W; sellers advertising 12 TH/s ship the board overclocked to ~200–240 W. Like the whole Nerd*axe family, you choose the operating point yourself in AxeOS — buy on price and revision, not on the advertised terahash.
How much power does a NerdOCTAxe use and what PSU does it need?
Roughly 160 W at stock and 200–240 W overclocked — plan for a 12 V / 18–20 A supply (about 240 W), which most vendors bundle. That's still a fraction of an industrial ASIC and fine on any household circuit, at roughly $21–31 per month at typical US rates when running overclocked around the clock.
Is the NerdOCTAxe quiet enough for home use?
At about 40–50 dB depending on revision, cooling configuration, and clock, it's louder than a NerdQAxe++ but still in quiet-PC territory — comfortable for offices and living rooms, borderline for bedrooms at full overclock. Rev 3.1 builds with the dual/quad-fan cooling and the large rear VRM heatsink run notably cooler and quieter under sustained load.
NerdOCTAxe or two NerdQAxe++ units — which is better?
Mathematically identical odds at equal total hashrate, so it's an operations question. One OCTAxe: single device to manage, one PSU, best desk footprint, top efficiency at stock (~15.8 J/TH on Rev 3.1). Two QAxe++: redundancy (one fails, half your hashrate survives), placement flexibility, and often similar total cost. Serious single-device buyers take the OCTAxe; redundancy-minded miners split.
Can a NerdOCTAxe really find a block?
On Bitcoin it holds roughly 1-in-1,500 odds per year at 12 TH/s — double a NerdQAxe++'s ticket, and the same class of home hashrate that has documented wins, including the famous ~6 TH/s block #920,440 in October 2025 worth ~$347,000. Pointed down the SHA-256 ladder, 12 TH/s expects blocks in under a week on the smallest chains. Same board, five very different lotteries.