New CV1835 Control Board for Antminer S19 XP

So, Bitmain has been using control boards from Xilinx, BeagleBone, and AMLOGIC for their S19 miners. Having three different types made it pretty tricky for folks wanting to overclock or use custom firmware. Now, they've added a fourth one to the lineup, and it looks like this one is designed in-house by Bitmain. It's called the CV1835 board, and I just got one of these with a new S19 XP. Check out more pics here. Honestly, with all these different designs, it’s gonna be a headache for miners, firmware devs, and resellers. A lot of buyers want specific control boards, but you can’t know which one you’re getting until you crack open that factory-sealed box. I’m really curious about what’s going on in Bitmain’s head with all these different models. Can’t be that they’re short on the Xilinx boards since they’ve been selling those like crazy on their site, and anyone can grab as many as they want. Is this just a way to mess with aftermarket firmware development?

I'm going with cost. Every dollar they save in making the boards is another dollar in their pocket. And, odds are they are not making them. The put out a RFQ for a board with whatever specifications they are looking for and then go with the cheapest bid. Would not be surprised if the cost of tweaking their code to work with the new board is included in the quote. No different then me having 3 of the exact same model Dell monitors in my office that were made by different companies and Dell just put their logo on it. Dell don't care since the specs are all the same, or at least supposed to be the same you can see a difference but according to the website it's the same. Home routers are also the same a lot of the time. Rev A Rev B Rev D and so on. Take them apart and they look nothing alike. But they are all the same model number and look the same on the outside. -Dave

alas, all of these mining manufacturers do the same stupid stuff every single day, MicroBT does something similar with their PSUs, they have a dozen of models, some output 12V some 14V, and in every voltage rating you got a handful of models, many are not cross-compatible, you ask the manufacturer at PSU model I am going to get? they will give you the same stupid answer that Bitmain gives "it's a surprise, you need to open the box first". So after buying a dozen gears of the same model, you will end up with a dozen different PSUs that aren't cross-compatible, and it's a nightmare when it comes to spare parts. I think I agree with Dave, it's all about the cost for all of these cheap manufacturers, if Bitmain finds another way to make a cheaper CB, they will add a 5th model to the same miner.

Has anyone had success with a fan spoofer for these boards?  I'm having a hell of a time finding something compatible.

noticed that as well... All of the 19K Pro's I sourced from you guys back in late 2023/early 2024 shipped with AMLogic boards - all of the S19's I've grabbed recently have shipped with the CV control board. I'd agree with what some of the others have said here - my gut-feeling is that it all boils down to cost.