Hacking KNC Titan / Jupiter / Neptune miners back to life. Why not?

[lightfoot]

Well fuck me......................................

DC/DC   Voltage (V)   Current (A)   Power (W)   Temperature (°C)
0   0.7863   34.6875   27.275   62.200
1   0.7810   35.3750   27.628   65.100
2   0.7867   35.5625   27.977   66.000
3   0.7897   35.5000   28.034   61.900
4   0.7866   32.6875   25.712   56.200
5   0.7850   33.3750   26.199   57.900
6   0.7885   31.8438   25.109   55.900
7   0.7886   31.9688   25.211   56.900

KNC 0:       | 76.06/72.23/72.67Mh/s | A:12 R:0+0(none) HW:3/.64%
KNC 1:       | 84.17/80.06/80.37Mh/s | A:13 R:0+0(none) HW:3/.55%

Ladies and gentlemen,
Boys and girls...
Party time is here......

https://youtu.be/s8MDNFaGfT4

[1715497374]

1715497374

[hawkfish007]

Well fuck me......................................

DC/DC   Voltage (V)   Current (A)   Power (W)   Temperature (°C)
0   0.7863   34.6875   27.275   62.200
1   0.7810   35.3750   27.628   65.100
2   0.7867   35.5625   27.977   66.000
3   0.7897   35.5000   28.034   61.900
4   0.7866   32.6875   25.712   56.200
5   0.7850   33.3750   26.199   57.900
6   0.7885   31.8438   25.109   55.900
7   0.7886   31.9688   25.211   56.900

KNC 0:       | 76.06/72.23/72.67Mh/s | A:12 R:0+0(none) HW:3/.64%
KNC 1:       | 84.17/80.06/80.37Mh/s | A:13 R:0+0(none) HW:3/.55%

Ladies and gentlemen,
Boys and girls...
Party time is here......

https://youtu.be/s8MDNFaGfT4

Should I send my three cubes on your way! 1 die each- low current, low power and low temp, 3 dies -hash at max frequency?

[lightfoot]

Possibly. Send one first, let me see if this fix fixes that.

However if you have two dead dies and it's been that way for a long time let me know.

Or if your Titan blows power supplies when plugged in.

Never dull. I'm going to bed, will see if this thing is hashing in the morning. Keeping the speeds down, but even 250mhz is purring along at 65mh.

[boomin]

So the dead dies thing is seriously the resistor MIA???  And if so what is the value of said resistor?  Or is it a simple jumper?

Thanks,

Boomin

[boomin]

I also have a titan that keeps popping the atx power supply.  Is that an easy fix?

thanks

boomin

[lightfoot]

I also have a titan that keeps popping the atx power supply.  Is that an easy fix?

Welcome to Titan land!

It's probably a shorted FET on the high side of one of the power supplies or a blown apart capacitor shorting things. Figuring out which FET it is takes some time to do. Problem is a short through on these Titans usually takes out one of the dies. However clearing it gets the rest online.

C

[Tupsu]

So the dead dies thing is seriously the resistor MIA???  And if so what is the value of said resistor?  Or is it a simple jumper?

Thanks,

Boomin

I do not think so.

Missing resistor from second cube.


Click to enlarge

[lightfoot]

Bad news cube ran file all evening but after letting it sit for 4 hours dies 1 and 2 throw errors. This is why you have to test your work several times.

And why we acknowledge failures as well as successes.

Crap as they say back to drawing board. And it was hashi g so nicely.....

[boomin]

So I found a board laying around that looks like a titan board - but when I plug into controller it says BE under type on the controller.  Any ideas?

Also one of the flakey Titan cubes takes down the whole controller (not killed just down)  It did work before.  Just all of the sudden crashed.

This is how I keep a cool head when not doing Comm. Real estate. 

Thanks,

Boomin

[Tupsu]

So I found a board laying around that looks like a titan board - but when I plug into controller it says BE under type on the controller.  Any ideas?

Also one of the flakey Titan cubes takes down the whole controller (not killed just down)  It did work before.  Just all of the sudden crashed.

This is how I keep a cool head when not doing Comm. Real estate. 

Thanks,

Boomin

Titan  processor
OCTTNC-AMMS-009
TAG779.00
TAG77900-1

Neptune processor
OCTTNC-AMMS-008
NNX465.00
NMX46500-1

and neptune board is with big BTC sign the circle which is not an Titan board.

[lightfoot]

Well this is a bit of a bummer. Basically what I think I'm looking at here is binned chips. More specifically, those jumpers supply power to the control circuits on the hashing chip on either die 0/1 or 2/3. Along with those four sets of jumper/resistors around the board that's how the Titan talks to the control aspects of dies 0,1,2,3.

With the resistor out those dies are off. Put them in and the die controller is powered. At that point those dies now talk on the chip bus, and can chatter/jam the bus if bad. So KNC never put the jumper in if the chip had bad dies on the top or bottom, they probably sold these as the "filler" to make out a set (so 3 90mh Titans plus one 40mh would still make a fair 300mh or whatever it was they sold this as).

Put the jumpers in, turn on the supplies, and the chip can run with all dies. Or it can go insane. Or it can run one die and not the other. Or it can happily run at 100mhz but jam the other die at 150. Strange things happen, and what I am *really* wondering is if this means that General Tarkin's code can fix this by doing his sweep the frequencies and reset a die if it goes bad (the "warm restart" thing). In which case he's going to be a God. We'll see.

Hey, we have to acknowledge failures as well as successes. It's the only way we learn. I don't charge for failures, so if things don't work there's either no charge or the bitcoin gets sent back.

Onward to the next thing. :-)

[lightfoot]

So the dead dies thing is seriously the resistor MIA???  And if so what is the value of said resistor?  Or is it a simple jumper?

It's a 0 ohm jumper. Usually you put those in if you want to isolate something during testing or production. You can also see some around the Titan chip itself, look for a pair of traces that have a jumper, then a jumper on the trace next to them. That I think is the signal lines to the chip, those other jumpers we're talking about go to a 3.3v vcc2 supply from the controller board, common bussed.

It's never as easy as we wish :-)

[lightfoot]

Meantime I got these pictures in. This is a Titan with both jumpers in place:



I know this had all cores running at full blast because you can't set a power plug on fire like this...



With anything less than a full component of hashing power. :-)

Side note: Do you really need to run at full power? 275mhz isn't that bad....

[GenTarkin]

Side note: Do you really need to run at full power? 275mhz isn't that bad....

What do you mean "full power" .... -0.0366v stock setting?
If so, 275mhz at that voltage would cause no harm, extremely inefficient but harmless.
Its running -0.0366v or HIGHER at 325mhz on all dies in a single cube which is dangerously close to meltdown of those connectors.

[lightfoot]

.0336v, 325mhz is a tad bit... much.

Temps that cause the power supplies to go over 85c

Stuff like that.

There's a pretty big power difference between 250-275 and 325. Bit less power seems to result in less problems.

C

What do you mean "full power" .... -0.0366v stock setting?
If so, 275mhz at that voltage would cause no harm, extremely inefficient but harmless.
Its running -0.0366v or HIGHER at 325mhz on all dies in a single cube which is dangerously close to meltdown of those connectors.

[Maxumark]

Side note: Do you really need to run at full power? 275mhz isn't that bad....

What do you mean "full power" .... -0.0366v stock setting?
If so, 275mhz at that voltage would cause no harm, extremely inefficient but harmless.
Its running -0.0366v or HIGHER at 325mhz on all dies in a single cube which is dangerously close to meltdown of those connectors.

In my experience (17 months running multiple Titans) I have found the burnt connector issue to be a result of a reduction of connectivity more than what speed you are running it the cube at. As some of these connections have been in service for months, or now over a year running 24/7 as the connection looses connectivity it increases in temperature even though the chip is running at its normal operation temperature at 300 Mhz. As the temperature of the connection increases it looses more connectivity taking more and more watts from the PSU to deliver the required power through the bad connection. I have recorded temperatures at over 200 degrees from a "smoking" connection while the cube was hashing fine with normal temperatures. My recommendation is to use only High end PSU preferably 80+ Platinum Rated, and run them at no more than 80% Loading. I have several Rosewill 1000W 80+Platinum PSUs (not really best in class, not fully modular which disappointed me at first but after the connection issues, I have now enjoyed 50% less connections per power wire with them being hard wired at the PSU) running 2 cubes each, so at 65% to 70% of PSU capacity. These 1000 watt 80+ Platinum rated running at 650 to 700 watts run so cool that the fans are not even spinning, while my 80+ Gold and Silver PSUs have ran their fans into the ground at 70 to 85% loads melting connections, and literally catching on fire. You think I am kidding right, exaggerating, being dramatic, No really I mean catching on fire. I had a Gold rated 1200 Watt PSU attached to 3 cubes running at 300 Mhz so a load of 900 to 1000 watts or about a 80 to 85% load. See photo below.

http://postimg.org/gallery/1xkfxyyei/

Obviously I don't put as much loan on the PSU as I did in the beginning. Go Platinum run at less than 80% Load. If you must go Gold run at 70% or less, and if you run Silver run at 60% or Less, if you are going to run Bronze or less I guess you will need to learn for yourself and won't listen to me.  I wish someone would have said to me " You just spent $$$$ on equipment that is going to run 24/7, don't skimp on the PSUs! Just get the best Platinum rated PSUs that you can, and run them as close down to 50% to 60% load as you can. If I would have used Platinum rated PSUs at a 70% or less load to start with over last 17 months just in energy savings with equipment at a 10% greater efficiency I would have saved over $2,000.  

Just my .005769 LTC    

[boomin]

I think that the connector issue is directly related to heat.  Once you start heating up resistance goes sky high and so do the plugs temp! 

you should (c) your .02 cents line.  Literally made me LOL

Thanks,

Boomin

[Searing]

Meantime I got these pictures in. This is a Titan with both jumpers in place:



I know this had all cores running at full blast because you can't set a power plug on fire like this...



With anything less than a full component of hashing power. :-)

Side note: Do you really need to run at full power? 275mhz isn't that bad....

well I got dies that 'won't hash' on anything less then 325 and 0.0366 now ..then again I have been running them 24/7 for 15 months that way (1st titan)
because till you guys came along..that is what KNC told me....ie you have 2 dead dies ...er too bad ...with our new firmware mod set all our stuff on adv page
to 325 and reboot...viola you are getting 306.1mh yea....unfortunately now that we have gotten you to 300mh and above we WON'T RMA your dead dies for
2 reasons 1) no rma's on cubes with only 1 dead die 2) no rma's on titans that get over 300mh

evil geniuses indeed

anyway mine have run so long and so hot on the 'dark side' not sure wtf to do...again did try to set some down....the cubes did not like that one lick...put them
back at 325 and 0.0366 regular settings no issues

so I don't do electronics..I assume all the above is just due to me having dumb luck?


edit: although me reading the above posts I should probably be more on the ball with connectors....all but 4 of mine now have been up at least 12 months or so (all knc)
the 3rd party orig titan 4 y adapters..i replaced with NEW KNC Y adapters...due to getting too warm imho ..thus the replacement with the 4 knc new connectors I had laying about
unused from when KNC finally got around to sending me some 4 months later..so will watch and stay ahead of the curve for now...and plan for replacing such...but again
cool so far and no browning on the cubes or the y adapters....looked.......just another thing to watch for as these 'evil' machines' try to brick themselves ...I mean we are talking 15 months here on what I expected to last until (with difficulty if not bricking themselves) best case at my most optimistic end of life was July 2015!

Every day's a 'gift' I guess Thanks for the info.

[Maxumark]

@ Searing,  Yes but you have been running high end PSUs with your Titans the whole time. I think that makes all the difference.

   

[Searing]

@ Searing,  Yes but you have been running high end PSUs with your Titans the whole time. I think that makes all the difference.

  

thanks good to know.....but again likely we just plain need to replace all Y adapters after 1 year of use.....24/7 for
that much time is likely pushing it too fare....so to be safe 1 year probably should be tops maybe

again the stuff at 12 months (mostly knc) seems ok ..but the 3rd party stuff I have yet is still a bit warm to the touch
also about 12 months or less ...again the 15 months stuff (4 3rd party adapters) are GONE the hottest of the lot to
the touch



so......likely figure a year max then if still mining swap them All out with NEW would probably be the wise thing to do

and as you said if like a Corsair ax 1200i platinum helps high end psu's .....well I guess it could not all be luck

but 15 months was just probably to damn long to have them 'not' degrade as a y adapter of any kind knc or 3rd party

anyway always remember I know zip ...just tossing this stuff out there