Topic: New Official AMT Thread - page 87. (Read 149472 times)

Because some of us do...

That is like windows saying, why patch windows, it works for a few... xD

Though, for my situation, where I am seeing the miner increase in hashing over time, on the faulting cards... It will not make much difference. It was the faulting cards stopping the rest of the cards from operating normally. However, something is still causing the boot-up failure to stop at "MONITOR".

In all honesty, I want the new software, just so I can tune the hashing-power, where I can not now. Especially when the errors get so high, that the hashing-power indicated on the screen, is not reflected in the hashing-results in the pool, due to the errors being obviously not sent, or rejected by the server after being sent. However, that is not my primary concern at the moment. My concern is getting more than 2 cards running.

Also, getting hold of at-least one more heat-sink, so I can run my system as 3 and 3 cards. At the moment, I only have five heat-sinks. Three are on cards that no longer function. (Well, they no longer show in the system, when hooked-up.) The power-supply I have coming, has no use until I can get at-least three more cards running. So I at-least have five hashing.

Yes I noticed the large negative ground-shielding, surrounded by large positive plates, which is the essence of an electrical capacitor. (Two plates of opposite polarity, separated by a layer of non-conductive medium.) Might explain the electrical run-off that is causing the VR to bump-up in time, which leads to ever-increasing voltage, leading to more capacitance, leading to more increasing voltage.

I am just not sure why one board does this, over another board, being all of the same design. With exception to the issue of substituted parts that may be leading to the failure. So hard to see some of the numbers of the smaller components.

I will be mapping-out the contacts tonight, and grinding-down one heat-sink, a fraction of a MM, which should be enough to avoid any thermal-grease issues, avoid all potential through-hole contacts, and give a more localized point of pressure contact. With less metal resting against the PCB itself.

I will be grinding the contact points about 1 MM smaller than the exposed metal, since the excess compound will squish-out to that small gap.

Going to look at the caps, and check the values.

P.S. I got my invoice today... Though it indicates the incorrect price. I paid $6089.00 not $5599.00 as the invoice indicates. (That was the earlier price, which I had just missed. I had to pay the $6089.00 price. Which is indicated on the AMT website invoice.)

Why do you need a new driver when a couple of folks supposedly don't have a problem running the system?

I requested some driver info so I can get these things working. That is my hold up at the moment. I might be able to get it working without the driver info, I am still working at it.

Mmm. Guess we gave them somethings to chew on for a while

Been staying quiet on here up to press due to not wanting to be a fan boy or amt shill as i have been called.

*update*
Mine and mellorbos rig has had 100% uptime since arrival minus user issues being putty shutdowns ethernet cables dropping out and general wtf moments.
 tried a variety of alt coins some work better than others but evidently give the same 0.03 btc a day.

share sizes have now dropped from the original 80000 sats btc th approx 59000 sats btc. no special anything just lots and lots of fans and the gigantic antec case fan on top.

on a side not the rig is keeping the room it is in at a steady 34*c in the late uk evening a little more through peak sun.

i to recieved an invoice for the order recieved hopes im receiving another one :-)

glad to see your still in here amt despite having 90% of your tongue cut out.

perhaps.

No, you can't do anything and we don't advise that you try anything either.  If your board has 4 caps, you have a 560 cap on the psu.  If you  have 1 cap, you have 1500 caps on the psu.  The difference is 20,000mmf.

Amount of copper? As in the cladding being to thin for the currents/thermal loads involved perhaps?

That would take a while to get the point of corrosion, some of the pastes did contain silver, like the Arctic Silver 5 thermal paste. In general,  despite it having silver we have not found that as the main reason for the problems. The main problem lies in the amount of copper in the board itself, which we had not discovered until recently.

AMT_Miners: If you want a board physical design review pm me. I've been involved in power systems not to mention a helluva lot of other circuit design for almost 40 years...

@AMT I sent you guys an email regarding some info regarding the drivers, that is a critical point in making this new firmware work. I have already added some datacenter friendly tools to make this large scale monitor friendly. Ideally I would port your webUI over if you have documentation on that, otherwise I will just try to get phpminer working. A more experienced dev than I already volunteered to assist me with that front.

Yes you are correct regarding the potential shorts. Traces are close to the edges yes.

For the vast majority on the market, not at the voltages used on these. Possibly a bit capacitive but that is more an issue if it is smeared across bare connections.
Possibly corrosive to aluminum though if containing silver.

First 300 boards. If there are no exposed via's on your board then I guess you're board isn't one of the first 300 and was tested and worker when shipped.

Yes very close.   Is thermal paste conductive?

At least that bit of boards looks covered. Remember they dis say that many - not all boards had the uncovered via fault.

Center left is a major no-no that thu-hole for screws is way way too close to those covered vias either side of it. Pressure IS going to cause faults in the screen layer.

Depends. Initially the thermal pad may have kept may/most from shorting out so any initial test would have passed. Unless there were pointy bits that is. After that things moving from thermal cycling and just time will be enough for it pierce the pads. It may well explain the delayed-death syndrome we have been seeing...

Yes Mylar tape would fix that. And again care must be taken to allow for that added gap produced. So far I would not count on that as it strikes me that whoever designed/reviewed the design of all this have zero-experience at it.

Here is the back side.... doesn't appear to have any layer improperly exposed.

No I take it as the signal and power vias were left uncovered leading to them shorting. Only the thermal xfr vias should be bare. And - due to the thickness of the green/red screen layer that is supposed to seal the boards one damn well better make sure that something bridges the resulting gap between the sinks and the thermal vias.
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Well if they were indeed shorting...  that problem would have been identified with initial testing.

Don't tell me that these systems where shipped without testing??!

If the layer where improperly exposed, then one could have easily made temporary fix by taping the exposed parts.