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Just curious what one might expect in this situation:

Running an Antminer S5 on 400W to 600W power supply. Would you expect the miner to turn off one of its hashing boards and run at half speed, assuming the PSU does not like a full load for long periods? Is there a failsafe in the machine that will limit its speed in terms of Mhz?

Thee is no failsafe in the miner for that. What you can expect is very short PSU life, increased HW errors and dropping ASICS (x)'s possibly entire board, requiring a hard reboot (cycling the power). In short - don't do it. For reference, at stock speed my s5's draw 630w from the wall with Gold PSU's.

It's a bad idea to get less then needed or just enough.   If you are dead set on it for some reason lower the running speed.   To do this long term is not a solution unless you run at lower freq.

I suggest getting a decent PSU that matches requirements.  They actually hold value decent.  So you can sell it after your done, or you might use it with another miner possibly.  Although server PSU's have started to take over.

Just get you a cheap server power supply for like $80 bucks and run two. With no problems.

http://s17.postimg.org/qrm8aa1pb/IMG_20160126_212842090.jpg

Thanks for the input!

Looking at picking one one of these. One of the boards apparently shot but other is okay...

No Problem.  Best of Luck.  If you do not have enough voltage that might be one of the boards is not working.

If you want to test things with the PSU you have then the thing to do is plug up one Hash Board at a time.

Start by disconnecting the Board that does not have the 4 Pin Power connector, run and check what happens. Then to test the other board you will need to turn the controller board 180 Degrees so that you can plug the 4 Pin Power connector to the other board.


Rich

Just tried to power a single s5 blade&controller from an 24A psu.

I got beeps and beeps and beeps and no hashing! The psu is too weak to power the controller, the blade and the fan.

Might have worked only on the blade, not sure

400 watt ps, the miner won't even fire up as it will trip the overcurrent protection on the PS and the PS will shut down.
Ditto 500 watt.

600 watt might work, *IF* it is a rare 600 watt PS with 50 amps or VERY close to that on the +12v rail AND a single rail, or it has 2 +12V rails that the PCI-E connectors are splt between with at least 25A per rail - but pushing it that close to the limit isn't a good idea, and more likely it won't have enough +12V capasity and there goes the overcurrent shutdown.....



 If you set the S5 ahead of time on an ADAQUATE power supply to be underclocked enough, you might be able to get by with a smaller poiwer supply afterwards.

24A PSU is not enough even for a single board. For a single board I would not use less than 30A /350W.


Rich

With really good quality 600W PSU (50A/12V, 4xPCIE) no problem

It might work on a single blade, the one without controller and fan, But it's risky

On lowest fan speed, i got 570watt on 240volt circuit, so...

Overclocked, a single S5 blade should go up to 300W DC, so its definitively okay for one blade. I suppose if you overvolt the 12v input, you could go higher, but, knowing this, it should not be too hard. And at stock settings, if the PSU is actually 600w, which probably means when its on 240v, then it can do the whole S5 no problem, with probably a decent overclock, too.

I see more like 600 watts at STOCK clock out of most of my S5s - but after factoring in the fan and controller/computer usage, 25A should be fairly safe on the hashboard-only side for a non-OC S5.

 I wouldn't even think about trying to OC an S5 on a single 600 watt PS - that's pushing it PAST it's ratings - even if it has a 50 Amp rating for it's +12 rail and is single rail.

Hmm, its not past its limit, 600W PSU's limit with .9 efficiency would be 660W limit at the wall. You'd have to really overclock it to get that. But if he said 400-600 PSU, it make it sound like it could be 400W for 120v and 600W for 220v.