Topic: ANTMINER C1 Discussion and Support Thread - page 7. (Read 129144 times)

@tbolt  Thanks for the pictures of the C2 Hash Boards.  They show the familiar TPS53355 Buck Converters used in the S1, S3 & S3+ Miners. Sort of what I expected to see but the issue is that these set the voltage with a potential divider, as adjusted by the pencil mod etc, and without some additional circuitry of which there is not sign, they are not programmable by the software. 

I assume these are not pictures of your actual C1 so there is still a slim possibility that there is a different version of the hash board that crops up in some units? However for the moment I remain confused...


Rich

@RichBC

These are the only images that I have of the C1 hash board.

@tbolt Looking at your results I feel the Core voltage must be changing as I cannot see that anything else could give such a big change in power consumption.

My measurements all relate to S3 & S3+ which I think have similar hashing boards to the C2. There is BTW at least as much uncertainty in the S3 threads as to weather it is possible to reduce the core voltage with the software. I have the schematic for the S1, have not seen one for the S3 but they are similar. I am definitely measuring at the correct place, the output of the Buck Converter after the large inductor and even with the correct firmware, Bitmain disabled voltage adjustment in the latest, it does not change. Yes to Save & Apply and power off & restart.

Do you have a picture of the hash board in your C1 showing the buck converters to compare to the S3?

Thanks

Did last attempt to make my spare C1 a full unit.   I pasted the back side of the board's.  It was a LOT of thermal paste even when I  made it spread out where it's a thin coat.   

Did 4 blades and at then end seemed like 1 works perfect on blade, others all depend.  So basically I have a parts unit for my other C1 if it ever craps out.   I will not be touching this one for a while.

I have not measured the core voltage directly with a DVM.

Are you sure you are looking in the correct location?
Do you have a schematic of the board or are you just using the ASIC device data sheet?

After you Modify voltage, you do a Save&Apply, then need to Power off and Restart the miner, right?

Thanks that is useful. I have an S3 & an S3+ and when I adjust the volts and measure the Core Voltage there is no change. Have you actually measured the voltage from the output of the DC-DC converter?

Rich

The C1 hashing boards are S3 family boards.

So, yes - they are capable of changing the voltage.

I have a C1 Batch 1 and a C1 Batch 2.


The best settings for Under-volting/Under-clocking were suggested by another user:

0675/200      530W      803Ghs      0.66W/Ghs

0760/250      790W       1008Ghs       0.783W/Ghs

I set mine to 803GHs now because it's summer here and heat is an issue.
In the winter, 1008GHs.

Hope this helps

I have read through most of this thread in the hope of getting an answer to what I thought was a simple question.

Does the C1 support Voltage Adjustment, and does this allow it to be underclocked and undervolted for better J/GH efficiency?


Here are a few quotes from this thread which explain why I do not have a clear answer.

The C1 seems to have voltage control because Bitmain have released a firmware version that changes the default voltage.


Some people have then reported that this increased voltage has increased the current drawn, again implying that the Core voltage to the chips is changing.







However there are then some people looking to reduce the Core Voltage in order to get better efficiency without success. Here is an example with dogie's reply..




Another quote from dogie.



 So does a C1 have voltage control or not? I find it difficult to believe that some have and some do not. Bitmain have gone to the trouble to have a field to change it and even release a firmware version with a change to the core voltage, and have made no mention that this might only be of use to some people. There are people that report a change in consumption with the increase from 0725 to 0760 and there are others who have adjusted the voltage with no change to the power consumption.

I feel that changing the voltage field does something, but find it difficult to believe that the core voltage is being altered. The pictures I can find for the C1 show a TPS53555 Buck Converter chip where you set the voltage with a potential divider, so I fail to se how this could be being controlled without some additional circuitry that would be visible? Is it possible that another parameter is being changed when the "voltage" is set and this is the reason that people are seeing an effect?

Bottom line for me, regardless of all of the above is. Has anyone actually measured the Core Voltage from the Buck Converter and seen it change when the voltage is adjusted?

Why am I interested? Because I quite fancy a 2nd hand water cooled miner, but only if I can adjust the voltage & frequency down for best J/KH.

Rich

I don't see them doing water cooled again.  I could be wrong on that.  But I'm thinking air cooled in future.  

But you are right the parts could be used to make S5 boards water cooled, I know I have seen it on forum before.

Enquired about S5 boards and controller. About $500 to get part's but no warranty if put in C1 case.

However...
This is what they said at the bottom of the email;

"if you are in no rush we have some nice things prepared for near future so stay tuned."

So I am guessing I am going to get rid of my hash baords but keep the c1 case and do a watercooled single s5

 

I have had a few people interested thinking I am trashing it.  This miner and cooling gear I spent a small fortune on.  I'm not looking to trash it.

I have another one I can keep it for parts.  If a good offer came yes I would sell, but again not looking for parts price and splitting up.

Maybe 1 or 2 boards just incase, to have spares for mine.
but maybe in near future sometime. i wouldnt take it complete either as shipping cost will be alot .

Mine is running fine it's no biggie whit it, just radiator that broke down, so waiting for a new one from EK coolstream , i have one old Thermaltake but just a 120 fan for it, not quite sure if i should mount it meanwhile , i don't think it can hold the temps cool enough .

Depending on what your willing to pay I might take you up on it.  It currently runs all 4 blades.... each with new thermal paste and as cleaned before new paste.  1 blade seems to work, 2 show 1/2 chips no x's just only half, other is a wild card. The miner is the blue boards, controller is a green board.   

I hate to sell too cheap incase I need the controller board or other parts for my other miner.  But if you have a decent offer feel free to pm me.

i might be intereset if you decided to sell it as trash

Think it's 200w a blade plus 35w for water kit

When I get back I will check my 3 blade C1.
Guessing 650w for 750ghs   0.8/ghs not the best.

I will check later I cannot remember..... sad since I spent so much time with them yesterday.  Basically 1 works perfect, 2 work half way, and 1 is hard to say.

So I'm going to hook up a kill-a-watt and see what type of power usage it has.  If I'm pulling the 800 watts or so for 600ish GH speed.... it is for sure going as parts or to be sold.

What color are the hashboard that are not working correctly?

I have 2 of them. Or 1 that works great and now one that is my part's for if other needs it.

... how many c1's you have?

Don't need water cooling kit. Just blades and controller?

For a device less than a year old it's a shocker really!

Yea I don't think running one makes much sense after thinking it through.   All the blades work but only one fully works.

I will leave it on to make sure it did have time for paste.  But I think this will go in parts pile for my other C1 incase I need parts.  Or I might sell not sure yet.