A good start.

If you want to learn it properly, implement your own coin and network - from scratch.

There's no reason to use mechanical cooling for something that can be throttled by error rate and be radically cheaper to cool with ambient air exchange.  Just filter the incoming air.


State level granularity doesn't cover the nuance needed.  Idaho, as a state, has cheap power.

Several counties in central Washington have the cheapest power in the nation.  Washington State, as a whole, has expensive power over in the Seattle metro area.

And if you're serious about a mining business, you already know what those counties are.

There are several important questions to ask at this point in time, for this question:

1. Are you a chip foundry, or do you have close ties to a chip foundry such that you can get ASICs at ~fabrication cost?  And do you have access to smart people who can design a more efficient SHA256 engine?  The first is much more important than the second.

2. Do you have access to megawatts of power at industrial pricing?  You're a perfect customer for megawatts of power - you have a totally constant demand, and can sign up for all the load shifting/peak shaving programs, as long as they're more profitable than your hardware, because there is literally no harm in reducing power consumption on demand.

3. Do you have access to some way of dumping a few megawatts of heat without paying anything (or pretty close) for cooling?  Ambient air exchange in a cold area with cheap power is probably the best option, though the throttling of ASICs in hotter temperatures (100+C ambient) is probably cheaper than paying cooling for that hardware.

If you can safely answer "Yes" to all 3, absolutely.  Go at it.  But you wouldn't be asking here.

If not?  Well, good luck.  You probably won't make money, but the tax writeoffs from the losses could be useful.

I have several ASICMiner Cubes in the US I would be willing to ship, if you're interested.

You have two cubes on the AX1200i that remain running perfectly, correct?

Swap the other two cubes with the ones on the AZ1200i.  If the ones on the 1200W PSU stay happy, it's PSU issues.  If not, it's cube issues.

It has no built in DHCP client, so, no, it won't "pick up DHCP."  They are static IPs only.

Set a static IP on your desktop/laptop to configure them if you have to.  Though the default setting being a common router IP is a bit silly IMO.

Your PCI extender cables are probably shit.

Get someone to ship you some good single PSUs from the USA?  I'm happy to do it, if you're interested.

I run quad GPU rigs on the Lepa 1600W PSUs with no trouble at all.

I've been quite happy with the Lepa G1200 (and, presumably, the G1600) for powering my cubes.  The G1200 runs 3 with no trouble at all, no issues with startup surge, and I'm quite confident it would run another one or two cubes as well.  They're expensive PSUs, but JonnyGuru approved, and quite efficient (peaking over 90% efficiency at about a half load, which is part of why I have such a large one).

You only have 325W on the +12v rails combined.  It should be OK if you're using both on low clocks (around 200W), but I wouldn't try high clocks (280W+) on that PSU.

It pulls more power through the fuse on high, so, yes, I'd expect it to be a bit warm to the touch.

Not overly hot, but if it's slightly warm, it's not a problem.

I've replaced all my fans with some spare 120mm fans I had laying around that pull ~0.3A and move a good bit more air than the stock ones.  I have some better ones on order as well.

Has anyone had luck adding heatsinks to the front side of the chips as well for cooling?  I don't know if it will make a big difference or not, but as two of my Cubes will not run reliably in the high clock setting, I figured it would be worth playing with.

I'm looking to pick up a few bad boards for Cubes.  They don't have to work, just need the heatsink and to be in good physical shape.

Not offering much, as they're not really worth much.  Shipping to the USA.

I have also seen reports that a failing fan (not drawing enough power, I suppose) will cause random restarts - it's worth trying if you're out of other ideas.

Cute.   Doesn't even run one proper server flat out.

Now, if you're talking about 2500A of 480v, then we can talk.

What mainboard/CPU combination are you using?  Two GPUs plus a CPU may be taxing the limits of your power supply, depending on how honest the rating is and what the +12v rails can provide.  Measure the voltage on your +12v rail while hashing and see if you're suffering from sagging voltage at the cards.

They should be fine.  Make sure you have good airflow in the proximity of the intakes and they'll stay cool.  Even the boxy cards are pretty good at sucking air.  You probably want to run the GPU fans at 80% or so.

If you're an open air setup, PCI-E slots have a good bit of "flex" built into their spec.  You can put a 5mm spacer between the cards to increase airflow to their fans without affecting the electrical connection and open up space for them to breathe.

I would suggest against using risers unless required, as they can cause reliability issues.  The're a possible solution, but I strongly discourage their use.  Try without them first.

Source: Extensive experience building dense, multi-GPU rigs for password cracking, including fairly reliable "impossible" systems such as 4x 6990s in a board without extender cables.

You still can't power 2500W on a standard home circuit in the USA.  Most homes have 110v wiring, at 15A or 20A.  That puts a reasonable max of 1500W per circuit, and even that's pushing it pretty hard for a lot of homes.  You basically require 240v for a 2500W system.  Many people in the US don't have access to that, or only have that wired for the laundry room and kitchen.

I have a few USB Twin Fury miners (5GH, 5W, require USB 3.0) for sale.  $500/ea.

I accept PayPal, and will do overnight shipping from Seattle if you buy two or more, otherwise USPS Priority Mail is included for free.

I'm selling reference 7970s and Twin Fan cooler 7970s for $400/ea.