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That is not the exact USB hub he is using. It is actually the newer blue Block Erupter 49 port with a 50 amp fuse.
Here is a picture of that exact same board delivering 2.55 amps to an ML2 that was stock settings to determine amperage draw.
This a screenshot of the exact same hub running 9 ML2's at about 600 Mhz if I remember correctly.
And here it is running there exact same devices he is using and the exact same USB hub 6 @ 600 Mhz also.
My point is that the blue hub is shown on eyeboot to deliver .5 to 1 amp/slot but that is when considering all 49 ports being used. As you can see, the hub is very much capable of delivering the required amperage with the ATX Power Supply he has which has a rating of 50 amps on the 5 volt rail.
And, further, the exact same ML2's and the exact same hub and power supply he is using (i sold him the setup and those are the exact ones I sent him). Notice it had been running 19 hours when I took this screenshot and the core freq must have been around 756 to 800 or so since the hash rate was showing an average of about 4.5 Mhs
Furthermore, that setup was able to reliably run ten on one hub during testing when dialed back to about 600 Mhz or so.
https://youtu.be/JZ7FsLkRQaw
I just wanted to add my experience with that hub and I know what it can and can't do.
)That changes things of course, it should then be able to deliver te power. 1 thing though, on the pic where you measured 2.55amp, it also shows voltage has dropped to 4.57 (Nearly 10% drop in voltage!!) That will definitely increase the amps drawn.
Here are some pics i just took:
Mind you, i'm running them at 900mhz! Not 600. That's why they're hashing @+5.1Mh/s.
Temps (with the extra fans i have) stay well below the 50 degrees celsius so i'm comfortable with that as well.
As you can see in the pics of the amp meter, though current drawn varies somewhat, the voltage stays exactly the same at 5.05v. With amp draw varying from 2.36amp to 2.44amp the wattage used varies from 11.918 - 12.322. With yours, 4.57v@2.55amp=11.6535 watt. But if the voltage on the ports drop, amps increase and that can and i think will cause problems.
My personal bet would still be to at least try a different hub. I've tried like 6 different high quality, high powered usb hubs from well known brands. Every one of them was much more expensive than the one i'm using now but none was able to keep up. I ended up using 2 or 3 hubs just to supply enough power (1 hub per moonlander!).
In my opinion, this 10 port hub is a lot cleaner to place with just 1 usb cord and 1 power supply. So no hardware with open connections cluttering around etc. (Plus a lot smaller to place)
When i get the extra 5 moonlanders in that i have on order it will be nice to see if the stability stays with this hub.
Thanks for the vid btw! Wish i had that many MLD's
Another thing @jakegoodwin586: Have you changed the setting for the voltages on the core and or memory? Can you post a pic of the pot settings?
I have had a little play with the pots after Bill kindly explained to me about them. I don’t think the pots have anything to do with them as it seems to be different ones dropping out each time I restart bfgminer.
