NerdOctaxe review

The eight-chip box on my shelf is a Zyber 8S, and sooner or later it raises the same question: what would this look like with newer silicon and firmware anyone can read? The NerdOctaxe is the open-source answer. Eight BM1370 chips, the ones Bitmain puts in the Antminer S21 Pro, on a single board with two coolers and a little colour screen. Around 9.6 TH/s on the original spec. Closer to 12 on a current Rev 3.1.

I haven’t had one on my bench, so this page leans on the vendors’ spec sheets, VoskCoin’s reviews and a handful of owners who’ve posted their real numbers. Where those disagree, I’ve said so.

The take

If you’ve run a NerdQaxe++ and enjoyed it, this is the obvious next rung, and it’s the same family in every way that matters. Same chip, same AxeOS-based firmware, same browser dashboard. Just twice as many chips and roughly twice the power, which puts it somewhere between a desk toy and a small heater. It won’t make you money. Twelve terahash is a much better lottery ticket than one, and it’s still a lottery ticket.

What I like about it is that nothing’s hidden. The board design is public, the firmware is public, and the revisions are documented well enough that you can see why the later boards run better. Compared with a closed box like the Zyber 8G (also eight BM1370s, also about 10 TH/s), you’re paying for that openness rather than for more hashrate.

What the numbers mean

Shopping for one is where the numbers stop agreeing with each other. Most shops still quote the original design’s 9.6 TH/s, which is fair enough. The wattage is where they fall apart: anywhere from 160W to 200W depending on who’s listing it, and Power Mining’s “15.0 J/TH” doesn’t survive its own 180W figure (that works out nearer 18.75). Plan the supply around 180-200W and you won’t be caught out.

The Rev 3.1 boards from Bitronics are a different animal. One owner’s first board arrived set to 700 MHz at 1.210 V and ran 11.47 TH/s at 213.5W straight out of the box, then held 12.0 TH/s at 200W once they’d dropped the voltage to 1.15 V and nudged the clock up. That’s roughly 16.7 J/TH, which is respectable for anything that sits on a desk. One owner, one board, mind. Silicon varies.

On the solo side, 9.6 TH/s against roughly 946 EH/s of network works out at about a 1-in-1,900 chance of a block in a year. At 12 TH/s it’s about 1 in 1,500. That’s eight to ten times a single Bitaxe, which is the whole point of buying one, and it’s still a number you shouldn’t build a budget on.

Revisions and the Hydro

Buy this one by revision. The Rev 3.1 redesign moved to a six-phase power stage, and that’s what owners credit for the jump to 12 TH/s and the better build quality; one owner who’d handled several NerdQaxe++ revisions rated the Bitronics boards well above the cheaper Chinese builds. Rev 3.4 adds temperature sensing on each chip and an XT60 power input. Whichever you get, it needs a proper 12V supply (vendors ship a 12V 18A brick), not anything USB.

There’s also a water-cooled Hydro version for anyone who wants it quieter, and Mineshop stocks it. I’d be careful with the overclocking chatter, too: the guidance from the community side is that the board isn’t built for heavy overclocking, and the owners getting good results are lowering the voltage rather than chasing the clock.

Who should get one - and who shouldn’t

Get one if you already run a NerdQaxe++ or a Bitaxe Hex, you know what solo mining is and isn’t, and you want the biggest open-source shot you can fit on a desk. The power draw is closer to a small heater than a gadget, so it suits a cooler room in winter better than a warm office in July.

Don’t make it your first miner. A single-chip Bitaxe teaches you everything this does for a fraction of the money, and the Bitaxe buyer’s guide sorts out which one. If the plan is profit rather than a better lottery ticket, nothing here changes the maths.