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Topic: Ultra Under-overclock image for A2 Innosilicon by Emdje - V5.0 - page 7. (Read 79786 times)

full member
Activity: 188
Merit: 100
I had went with single parallel option on the 10k, seemed to work fine, running at 0.94v although math says 0.92v, wish I had done some more testing before hand though but hey that is the way it is. Good job!, while crude this is a chart I did with this board, I just ran 50k shares at each frequency, I should have ran more but in the interest of not taking 3 hrs for a test.

Frequency|
1100
1120
1140
1160
1180
1200
1220
1240
1260
1280
1300
1320
1340
1360
1380
1400
HW errors|
2
2
0
4
0
5
4
1
10
9
17
14
36
43
90
89
Current on 12v|
14.28
14.45
14.67
15.06
15.23
15.46
15.64
15.76
16.13
16.37
16.63
16.75
17.2
17.44
17.53
17.89
Watts
173.502
175.5675
178.2405
182.979
184.8922
187.6844
189.8696
191.3264
195.8182
198.5681
201.7219
203.1775
208.636
211.1984
212.2883
216.6479
member
Activity: 92
Merit: 10
So I decided to take a crack at overvolting and overclocking my A2 110. The guide provided earlier in this thread does not cover the V4 boards, and I could not find one on the forums so I decided to post it here.

The A2 110 V4 blade buck controllers are based on Linear Technology's LTC3856. Datasheet. Following Pg 29, the feedback resistors will be connected to FB (pin 2), and dictate the output voltage via the equation Vout=0.6*(1+RB/RA). The controllers are set up to use the chip's diffout configuration, but the equation remains the same.

There are 3 different controller layouts on this board:
One side
Other side
End of blade

As we see in the photo, there are two resistors labeled 01C and 66B, 10kΩ and 4.75kΩ respectively.
This yields a stock voltage of 0.6*(1+4.75/10)=0.885V

I figure I want around 0.925V, following the target voltage earlier in this thread.

There are two ways to handle this. We can decrease RA or increase RB. I had a lot of 24kΩ and 27kΩ resistors left over from a previous project. It just so happened that if I used one of each value in parallel with each RA and RB, 27kΩ||10kΩ=7.297kΩ and 24kΩ||4.75kΩ=3.965kΩ yields 0.926V.

So I soldered a 27kΩ across the resistor marked 01C and a 24kΩ across the resistor marked 66B. I ended up with ~0.933V on average.

If you want to only solder one resistor, Rp in parallel with RA (01C), it would follow this equation: Vout=0.6*(1+(4750/(10000*Rp/(10000+Rp)))). Solve for Rp given a target Vout.

I've yet to do long term overclock testing. I'm testing 1200MHz stability for now. On average the power consumption is up ~2A to ~15A on the 12V rail. My stock power supply is not able to supply more than 4 blades stock, much less 4 overclocked blades. I just split the load half and half between the stock power supply and another 1kW power supply. I should have some numbers soon.

After 1hr of 1300MHz, it seems successful. I'll run it overnight and see how it fares.
hero member
Activity: 686
Merit: 500
Also check the polarity of the power going to the boards with the original power supply. I had to switch the plus and minus with the pcu I am using due to the connector being different.
full member
Activity: 188
Merit: 100
I have a question that hopefully someone will be able to answer.

I'm trying to run my 60 and 88mh units using a server power supply. I cut the ATX harness off of a dead PSU, and connected all of the 12v 5v and 3.3v wires on the harness to the appropriate server PSU outputs. I thought for sure that would be all that's needed, but the controller doesn't work. Any idea what I'm missing?
What server PSU are you attempting to use? How much of it does not work, any , some lights or just dead? have you checked to see if there is output on the lines?

The PSU is a PFE1100. It's breakout board outputs 12v and 5v, and I'm using a buck converter to make 3.3v from the 12v output.

So nothing comes on? I don't really have a A2 miner but I have see photos of the controller board, I am going to assume that you do have power on the 12 and 5V rails , I don't know if the 3.3v is needed nothing that I have seen needs 3.3 just 12 and 5 and it looked like there might have been regulators on the board already for a 12->5 conversion. I would check power on the Rpi, you should be able to probe the capacitor at the normal input jack , if you got 5v there and it is still not on then you might have a big problem. On the connectors going down to the hash boards I *think* that pins 2&4 are +5 and 6,8&10 are gnd so you could check that as well. Really I think all the controller board does is bridge on the ATX psu and power the PI, I dont really know why it would need +12 at all unless it does some basic power monitoring to see if there is power there.

This are all guesses really , if you could get me a good straight on shot of front and back, I am working on a new controller board, I just only have one card I have adapted to the RPi, that power supply is pretty $$$ I hope you didn't have to pay that much for it.
legendary
Activity: 1596
Merit: 1000
I have a question that hopefully someone will be able to answer.

I'm trying to run my 60 and 88mh units using a server power supply. I cut the ATX harness off of a dead PSU, and connected all of the 12v 5v and 3.3v wires on the harness to the appropriate server PSU outputs. I thought for sure that would be all that's needed, but the controller doesn't work. Any idea what I'm missing?
What server PSU are you attempting to use? How much of it does not work, any , some lights or just dead? have you checked to see if there is output on the lines?

The PSU is a PFE1100. It's breakout board outputs 12v and 5v, and I'm using a buck converter to make 3.3v from the 12v output.
full member
Activity: 188
Merit: 100
I have a question that hopefully someone will be able to answer.

I'm trying to run my 60 and 88mh units using a server power supply. I cut the ATX harness off of a dead PSU, and connected all of the 12v 5v and 3.3v wires on the harness to the appropriate server PSU outputs. I thought for sure that would be all that's needed, but the controller doesn't work. Any idea what I'm missing?
What server PSU are you attempting to use? How much of it does not work, any , some lights or just dead? have you checked to see if there is output on the lines?
full member
Activity: 157
Merit: 100
Hi all, Emdje, did you manage to fix pool-switching problem (mainly betarigs) on 4.0 image? E.g. by putting back the old stratum, but still supporting the xnonce? Thanks.

I am not sure will have to check that.

Seems like betarigs is out of game for good, so Im back to 4.0 and MRR.
legendary
Activity: 1596
Merit: 1000
I have a question that hopefully someone will be able to answer.

I'm trying to run my 60 and 88mh units using a server power supply. I cut the ATX harness off of a dead PSU, and connected all of the 12v 5v and 3.3v wires on the harness to the appropriate server PSU outputs. I thought for sure that would be all that's needed, but the controller doesn't work. Any idea what I'm missing?
hero member
Activity: 686
Merit: 500
Hi all, Emdje, did you manage to fix pool-switching problem (mainly betarigs) on 4.0 image? E.g. by putting back the old stratum, but still supporting the xnonce? Thanks.

I am not sure will have to check that.
full member
Activity: 157
Merit: 100
Hi all, Emdje, did you manage to fix pool-switching problem (mainly betarigs) on 4.0 image? E.g. by putting back the old stratum, but still supporting the xnonce? Thanks.
hero member
Activity: 686
Merit: 500
How do you modify the fan power output?  Are PWM fans compatible with the miner?  I'm looking for a way to stop the fans from spinning at 100% all the time, my room temperature is cool enough where it doesnt need to run at full speed 24/7. .. besides that, they're ridiculously loud.

thanks

The stock fans run full power, they cannot be adjusted. I have put different fans in it, that are more quite and can be adjusted (by thermocouple, although I use them at 100% speed) in speed. (replaced the one stock fan with 3 of these, less power, less noise)
full member
Activity: 142
Merit: 101
How do you modify the fan power output?  Are PWM fans compatible with the miner?  I'm looking for a way to stop the fans from spinning at 100% all the time, my room temperature is cool enough where it doesnt need to run at full speed 24/7. .. besides that, they're ridiculously loud.

thanks
full member
Activity: 188
Merit: 100
Well in typical fashion when you want something it gets lost in shipping Sad

Looking at the two boards I have it looks like there are two chains of hashing chips, the one board that has the 10 chips on it has 10 LEDs for the chips, the other board that has 12 slots but 10 chips only has 8 LEDs for the chips 1-4. Does anyone know how many different variants of these boards there are? Also can just the boards be bought and anyone have a price. The 10 chip one is  green and says it is official the other is blue and just has a version number.

I hope to have some high resolution photos next week and if I am lucky some X-Ray images at some point.
hero member
Activity: 686
Merit: 500
That would be great info to have. thnx  Smiley
full member
Activity: 188
Merit: 100
Hi everyone, I am a little late getting into the game but I have picked up what is described as an 110Mh A2 terminator with two bad blades shipped with two replacements. I got the two replacement blades today and looking at them one is a 10 chip board as I would expect and the other is a 12 with two missing, I notice a small loop back resistor. He said they were working replacements sent from innosilicon, they are defiantly pulls and are rough looking esp around the power connectors. I plan on taking a lot of photos, I haven't been able to find much in the way of schematics and such but plan on making a few.

Anyway hope to help with anything I can,

Jarrid
hero member
Activity: 686
Merit: 500
Thank you for the image.
It works great on the first try.
I was able to connect with DHCP by finding the IP address on my router control screen.

However, when I turned it off, and moved the miner a little, and then turned on again, and re-connected it, the a2 miner stopped mining after that.  I looked inside the front fan area and can see green lights blinking on and off on all boards.  I'm not sure, but maybe it's a hardware issue?  I sent Innosilicon an email and they said some boards might need to be reseated.  Do you have any advice or instructions on reseating the boards?

If I understand it correctly and it is not a typo and you mean reseating intead of resetting than that probably means checking all connections. Plugging everything off and on again.
newbie
Activity: 5
Merit: 0
sr. member
Activity: 476
Merit: 250
Very interesting., This is pretty cool.
hero member
Activity: 686
Merit: 500
Quick question, does anyone know where the cgminer config file is located? I'd like to change some settings, such as --scan-time

Thanks

Sorry for the late reply, it seems I don't get an email anymore when there is a message in the topic.

There is no config file, but you can add it to the index.php on line 20

Hope it helps.
legendary
Activity: 1596
Merit: 1000
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