To start with, there have been solely CPUs, then GPUs, for bitcoin mining. Then got here the mighty ASIC in 2013, and with it, the “shoebox” kind issue that has change into emblematic of the bitcoin mining trade.
What comes subsequent? Will the shoebox design persist as commonplace for bitcoin mining ASICs? Or will one other kind issue that extra resembles conventional datacenter servers win out?
ASIC producers are more and more betting on the latter – or at the very least, {that a} hydro-cooled server rack design will change into a considerable portion of bitcoin mining fleets. Furthermore, they’re leaning into the “direct-to-chip” cooling for additional effectivity good points.
Auradine’s new AH3880, launched March 2025.
Final September, Bitmain introduced its mannequin U3S21EXPH (a little bit of a mouthful, eh?) developed in a partnership with Hut 8. Its U3 design signifies that one unit takes up three areas in a conventional server rack. MicroBT quickly adopted with its M63 Hydro sequence, as did Bitdeer’s Sealminer A2 Hydro unit.
Following go well with, Auradine launched its server rack mannequin, the AH3880, this March. Its U2 design, which occupies two server slots, is a bit smaller, but it surely packs extra hashrate per unit of house at 600 TH/s (or 300 TH/s per slot) versus Bitmain’s 860 TH/s (286.66 TH/s per slot).
Shoebox out
So, what’s with the change up from the standard shoe field? For Auradine, it’s all about buyer demand.
“[Our new model is] primarily based upon a variety of suggestions that we bought from our miner prospects … we have been working with the miners even all through the design course of,” Auradine CSO Sanjay Gupta mentioned on the latest Mining Pod. “They indicated to us that they have been on the lookout for a high quality hydro primarily based miner.”
In its partnership with Bitmain for the U3S21EXPH, “Hut 8 was instrumental within the customized design for the infrastructure, notably the U kind issue which is suitable with HPC model structure,” Hut 8 Head of Investor Relations Sue Ennis instructed Blockspacelast September. (Extra on the excessive efficiency computing angle later).
The good thing about a server rack ASIC lies in standardization. Bitcoin miners are more and more marching consistent with the standard datacenter trade, and that trade might see 40% adoption of direct liquid-to-chip cooling by 2026, in line with information middle developer Cyrus One.
If miners undertake this design, then theoretically, they’ll optimize their provide chains by converging on server designs which might be turning into finest follow within the big-boy information middle sector.
This might make constructing and repairing bitcoin mines simpler. And it might additionally make mining firms extra nimble in the event that they wish to flex out of bitcoin mining and into different types of compute.
Enter AI and HPC
As with a lot mining information at the moment, in fact the spectre of AI is looming within the background.
If miners assemble their information facilities with conventional server rack designs, there may be one much less ache level in the event that they wish to retrofit these websites for AI and HPC masses. After all, they’d nonetheless want to reinforce the sinews, muscle tissues and veins of their operations with extra strong networking and electrical infrastructure, however server racks would offer a spine for AI/HPC providers that requires much less restructuring than legacy bitcoin mines. As Ennis put it, “the U kind issue … is suitable with HPC model structure.”
Echoing this, Gupta mentioned in our Mining Pod interview that “[The U form factor has] been used for the AI information middle. It’s straightforward to regulate. It’s bought a excessive [power] density to it … [it] is extraordinarily related for AI information facilities as nicely, and we’re taking a look at a joint technique between AI for HPC and Bitcoin mining. So the U kind issue works nicely with that.”
Who’s shopping for it?
Maybe for sure, the server rack kind issue for bitcoin mining remains to be in its infancy, and whereas there may be promise that such a design might win out, there’s no assure.
To start out, bitcoin miners won’t solely want to remodel the innards of their mines but in addition fully rewire their electrical infrastructure (which is unlikely to occur at current mines).
Cholla’s Brad Cuddy, which operates hydro-cooled ASIC miners, instructed Blockspace final September that “he’s excited to see the shift from the shoebox design to the [server rack] kind issue.” However he mentioned the U3S21EXPH’s voltage vary is incompatible with sure electrical infrastructure that miners use with different Bitmain fashions.
“The restricted vary of 380 to 415 volts reduces its compatibility for retrofitting. I’d have favored to see the voltage vary go all the way in which as much as 480 volts to permit for extra interoperability with present infrastructure deployments,” he mentioned.
As such, it’s probably that we’ll see miners combine these items at new websites. Hut 8 is taking this method with plans to host 15 EH/s of U3S21EXPH items for Bitmain (with an choice to buy) at its Vega, Texas website, which is because of begin working in Q2.
Up to now, Hut 8 is the one public purchaser of Bitmain’s U3S21EXPH. Gupta didn’t reveal which miners are below contract for its AH3880, however he did say they embrace a number of industrial scale non-public and public miners. It wouldn’t be stunning to see MARA, certainly one of Auradine’s key companions which has additionally invested upwards of $50 million within the firm, undertake the mannequin.
Ought to Hut 8’s Vega website run easily on Bitmain’s mannequin, and if we assume that MARA will deploy Auradine’s, public miners could lead the place others will observe, and we might see a brand new kind issue slowly seep into trendy mine design.
