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” type issue that has develop into emblematic of the bitcoin mining trade.
What comes subsequent? Will the shoebox design persist as customary for bitcoin mining ASICs? Or will one other type issue that extra resembles conventional datacenter servers win out?
ASIC producers are more and more betting on the latter – or at the least, {that a} hydro-cooled server rack design will develop into a considerable portion of bitcoin mining fleets. Furthermore, they’re leaning into the “direct-to-chip” cooling for additional effectivity beneficial properties.
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 implies that one unit takes up three areas in a standard server rack. MicroBT quickly adopted with its M63 Hydro collection, as did Bitdeer’s Sealminer A2 Hydro unit.
Following swimsuit, Auradine launched its server rack mannequin, the AH3880, this March. Its U2 design, which occupies two server slots, is a bit smaller, however it 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 swap up from the normal shoe field? For Auradine, it’s all about buyer demand.
“[Our new model is] based mostly upon numerous suggestions that we bought from our miner clients … 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 based mostly miner.”
In its partnership with Bitmain for the U3S21EXPH, “Hut 8 was instrumental within the customized design for the infrastructure, notably the U type issue which is appropriate 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 in line with the normal datacenter trade, and that trade might see 40% adoption of direct liquid-to-chip cooling by 2026, in keeping with knowledge heart developer Cyrus One.
If miners undertake this design, then theoretically, they will optimize their provide chains by converging on server designs which can be changing into greatest follow within the big-boy knowledge heart sector.
This might make constructing and repairing bitcoin mines simpler. And it might additionally make mining corporations 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 right this moment, after all the spectre of AI is looming within the background.
If miners assemble their knowledge facilities with conventional server rack designs, there’s one much less ache level in the event that they wish to retrofit these websites for AI and HPC hundreds. After all, they’d nonetheless want to reinforce the sinews, muscle tissues and veins of their operations with extra sturdy networking and electrical infrastructure, however server racks would supply a spine for AI/HPC providers that requires much less restructuring than legacy bitcoin mines. As Ennis put it, “the U type issue … is appropriate with HPC model structure.”
Echoing this, Gupta mentioned in our Mining Pod interview that “[The U form factor has] been used for the AI knowledge heart. It’s simple to regulate. It’s bought a excessive [power] density to it … [it] is extraordinarily related for AI knowledge facilities as properly, and we’re taking a look at a joint technique between AI for HPC and Bitcoin mining. So the U type issue works properly with that.”
Who’s shopping for it?
Maybe evidently, the server rack type issue for bitcoin mining remains to be in its infancy, and whereas there’s promise that such a design might win out, there’s no assure.
To start out, bitcoin miners is not going to solely want to remodel the innards of their mines but additionally utterly 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] type 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 might have appreciated to see the voltage vary go all the best way as much as 480 volts to permit for extra interoperability with present infrastructure deployments,” he mentioned.
As such, it’s seemingly that we’ll see miners combine these models at new websites. Hut 8 is taking this strategy with plans to host 15 EH/s of U3S21EXPH models for Bitmain (with an choice to buy) at its Vega, Texas website, which is because of begin working in Q2.
To date, 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 embody a number of industrial scale non-public and public miners. It wouldn’t be shocking to see MARA, one in every 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 might lead the place others will observe, and we might see a brand new type issue slowly seep into trendy mine design.
