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BatteryHasher has andersons
#11
If you build your own power supply, you could go with a buck to drop voltage down to 12V, then use regulators to get the 5/3.3 to the motherboard. Then use bucks for the gpus. Depending on amp draw, you could use 1 per card, or 1 for several cards, depending on which buck you got.

That's just a guess at this point, though. Not sure if that'd work directly, but could be expounded upon
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#12
(09-29-2018, 12:31 PM)Korishan Wrote: If you build your own power supply, you could go with a buck to drop voltage down to 12V, then use regulators to get the 5/3.3 to the motherboard. Then use bucks for the gpus. Depending on amp draw, you could use 1 per card, or 1 for several cards, depending on which buck you got.

That's just a guess at this point, though. Not sure if that'd work directly, but could be expounded upon

So what’s going to be more efficient, a pure sine wave inverter with 90% efficiency or going bucked dc. I have not messed around with changing current volts so I don’t know what to expect. Also, cost for the base system is not really an issue as this pc/rig will be repurposed during the summer months.
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#13
Going from DC->AC->DC will generally always be worse than from DC->DC. Most inverters run 98% max, and that's usually under certain load conditions (I've seen some state that 98% efficient is achieved under 50% load, others under 80% load; so it depends on your particular inverter)
The bucks are usually fairly efficient. I think Julian Ilett built one that is 95+% under varying loads. It's just the way they work. A linear regulator will be less efficient the greater the difference of the input/output voltages. That's why I said use buck to 12, then regulate to get 5/3.3. You could even use 3 bucks from 48V to 12/5/3.3. They all share the common ground, so there "shouldn't" be any issue there to the mobo.

Also to note, you don't "need" a pure sine for a computer psu. It'll work just fine on a modified, if the psu's are relatively new. The newer ones do switching & inductors instead of using a stepping transformer. Th UPS units that you can get cheap for power blips are modified sines and the computers run just fine with those. Altho, that doesn't mean their converting efficiency hasn't dropped a bit.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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#14
https://m.youtube.com/watch?v=tgqskma8y9E&t=3s

Check it out, it ran yesterday and all night.
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