Buck Converter to Power Crypto Mining?

Lt.Dan

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Hey guys, I've been dabbling in Crypto mining a little lately, and have built a simple little GPU miner. I've been doing tons of research and reading etc.

My question first needs a quick explanation. The entire rig, is powered by an ATX PSU, which supplies various voltages to various components. The most important, and most power consumption, is the 12v supplied to the GPU's via their 6+2 PCIe pins. ATX PSU's can get pretty pricey when you get into multiple GPU's, and their efficiency can be less than desirable (85-92%). This can be even worse when it comes to powering it via solar, because after MPPT conversions, then inverter efficiency losses, and then the efficiency loss through the ATX PSU can mean the 500w the actual GPU rig is drawing, is really ~630w. Just doesn't make much sense to go from DC -> AC -> DC.

My question is, does anybody know if they can power their GPU's (and the PCIe Risers), from a 48v -> 12v buck converter? These can be had much cheaper, and typically have a much higher efficiency (upwards of 95%). And you also dont have the loss of the inverter as well. My only concern is if the buck converter has any voltage sag, I'm unsure of how the GPU will react.

Obviously I will need to leave the ATX PSU to supply the other components with 12v, 5v, and 3.3v, but a much cheaper PSU can be used, and the draw will be much much less.

On a side note, I have found 48v ATX PSU on the internet, that are pretty much drop in replacements, but their price tag of $800-1200 is a little off-putting.

Please discuss :)
 

Lt.Dan

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Joined
Dec 25, 2020
Messages
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Location
Visalia, Ca
Yes.
Dc2dc atx power supplies are available.

Also they make atx breakout boards.
Yeah I have already found DC to DC ATX Powersupplies, but they are highly, highly expensive, and their efficiency claims are barely 75%. Seems like a garbage product to me.

I was hoping to power the low wattage stuff (mobo, CPU, mem, etc) with a normal 120v PSU, then run a DC buck converter LIKE THIS to power just the GPUs. Yielding a much higher efficiency.
 
Joined
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Yeah I have already found DC to DC ATX Powersupplies, but they are highly, highly expensive, and their efficiency claims are barely 75%. Seems like a garbage product to me.

I was hoping to power the low wattage stuff (mobo, CPU, mem, etc) with a normal 120v PSU, then run a DC buck converter LIKE THIS to power just the GPUs. Yielding a much higher efficiency.
I remember reports of folks being disappointed with the Daygreen converters.
I just had a quick look and can't find anything better though.
 

Sanwizard

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Feb 2, 2021
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I remember reports of folks being disappointed with the Daygreen converters.
I just had a quick look and can't find anything better though.
This guy is my hero on the subject of solar powered Crypto mining:
 
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