Topic: GekkoScience has a new pod miner, just in time for Christmas - page 6. (Read 6703 times)

it does as more current will pass as it switches more times per second, so drains more power. these asics gets quite hot at 700-725 mhz the stock fan wont keep up, the 6600 rpm axial fan i set helps a lot to keep them but i see generating the push pull helped me to pull more heat out but i saw no hashrate improvements in my case.

i will test as @sidekick shared, i will now under and over volt it and do push pull with axials so y pass a ton of air to it to avoid having thermal issues and see where do we get

Hey @kano!!!! THANK YOU my code now works so i can test each chip and set temp telemetry on each this is amazing!!!

THANK YOU!!!

But can it produce more heat when clocked higher, even though the potentiometer is not touched?

In CPU overclocking, as long as you use fixed voltages, the heat output should not be affected by the clock speed. It is usually directly related to voltage.

As long as heat is managed, the only damage will be your hashrate tanking because the data no longer makes sense.

Regarding safety and damage: I know all types of overclocking come with some amount of risk, but usually it is related to voltage and heat. What about pushing clock speed without changes to the voltage (potentially even slightly undervolting and improving cooling with better fans, ducts, thermal pads on the back...)?
Are there any hints that suggest a strong overclock deteriorates ASIC mining chips faster than stock clock speed? [while keeping voltage and heat on normal levels]

You're probably butting into the power headroom already. In fact I'm surprised you didn't hit it already, but keeping the main regulator cool probably helps a little with Rdson current measurement.

More voltage should give you more ability to clock higher, but the main regulator is current limited. Shouldn't hurt anything to turn the voltage up a bit and see where it goes. If you suddenly drop to no hashing and only fans drawing power, you've tripped the OC and need to power cycle the whole unit. The voltage range capable with the pot is safe; just make sure you keep the chips cool and there should be no damage.

I've got a test unit I want to mess with, raise the current limit (will require replacing some parts to raise the safety ceiling) and repeat some of your tests to see about improved cooling efficiency and push the hashrate super high.

You can definitely increase voltage if you have the cooling (which it seems, you do). Especially if you decide to go for watercooling, you should have enough thermal headroom to give it more power through that potentiometer.
Reducing it from stock may be interesting for improving efficiency, but as far as I know these are already individually tuned by the factory and set to a good safe value. So if anything, I'd find it interesting to see how far it can go with ample cooling and higher 'power target'.

yeah so 3.2 was luck and not sustained over time. so mine is 2.8 T highest i got but they were running very cool!!!)

@sidekick what will be the effect on moving the variable resistor on voltage? will it give me higher Hashrate/ or put me into the power cap soon? and will the asic be damaged if all left or all right? or it is safe to play with it?

Ohh now i see why i get flat behavior after 700mhz, the power i am measuring includes the axial fans and my RBPI to get to 725 i push my fans to 70%, i assume these are the extra 20w.

This is what i see:
- 725 not stable at all- got 3.2 for 3 minutes then crashes down to 500Mhz and as it reboots and reboots Hashrate became to 800G but power never came down. Temps on heatsinks were stable at 45 degrees celsius. I set anoush pull using original in front and exhaust acial at 50% the front i put it on tilted position resting on the cables and pushing the air towards the board (i guess at 45 degrees of angle) that caused higher heat efficiency and took the heatsinks to stable 36 degrees celcius BUT 0 effect on stability… and power got to 138 ( the 3 wats i assume got from the added fan). same 3.2 then crash the 800.

-700 push pull stable on 2.7-2.8 i did not saw these going higher than that after 24 hrs, temps stable on 35 degrees the hottest spot. consumption still high 135.

-650 the current i have only pull axial at 2700 rmps silent ops, stable 2.57- 2.6 T @ 114.5w consumption/ 42 Degree celcius at heatsinks /  net that is quite great vs other setups as looks close to 45j/t and the others were like 50.

something is wrong at 725, i have no idiea what to change ( but not sure if changing stock voltage will help) i dont want ro fry them.

so we can say 3.2 is not valid as they crashes after little time… so to me at least not messing up with voltage 2.8 is the top. i am converting to water cooling but as i saw heatsinks on 35 degrees and no improvement i don’t expect it to change, same as i want it to run 24x7 650 will give better efficiency and longevity.

i am on my iphone so cannot paste the cgminer screen but miner.php and looks ugly but here it is at 650, close to 24 hr run.

Date: 17:47:01 29-Jan-2023 UTC+00:00
Computer: cgminer 4.12.1 When: 17:47:01 29-Jan-2023 UTC+00:00 Status: Success Message: 2 ASC(s)
ASC Name ID Enabled Status Temperature MHS av
MHS 5s
MHS 1m
MHS 5m
MHS
0
GSF
0
Y
Alive
1
GSF
1
Y
Alive
Total:
2,573,644.91 3,004,809.31 2,692,198.92 2,618,194.45 2,5!
2,606,626.98 2,414,314.80 2,616,199.07 2,626,635.49 2,6
5,180,271.89 5,419,124.11 5,308,397.99 5,244,829.94 5,2

my setup is running very stable so far, as you can see below
unfortunately i have only one compac f stick running on one of the two usb hubs - due to overclocking the other ports on the hub have died (and i'm waiting for a new gekko hub delivery )
all hardware is only connected to one and the same rpi4

Alas, it does require running for a while.
I've even had 2.9TH/s reported at startup due to random luck.

As long as you reset the display as explained at the beginning of https://kano.is/gekko.php#perf
and then let it run for a few hours, then the reported hash rate is meaningful.

Holy crap did you say 3.2TH? 725MHz should see 2.9TH but that's still pretty nuts. The main regulator should cap at around 120 watts output.

Nice one!! i used a high CFM Axial fan, it is in some of my postings, i will share my results of my testing just needed to do one more … but those 80mm fans made a lot i can tell full speed kept the heatsinks on 37 Degree Celsius and i was running at 725Mhz 3.2-3.4 T and power was strangely flat to about 140W the issue i saw was more on the asic was not keeping up the frequency. but i can tell got interesting results I will post them.

Thank you @Kano!!! yeah I am aware you are the designer and developer amazing job!!! it is impressive THANK YOU!!

That is what I have done.  I created an adapter to go up to a 92mm fan as the airflow increases from 55.5 m³/h for the 80mm up to 78.9 m³/h for the 92mm.  The 120mm could easily be done, just trying to keep these somewhat small, but the airflow would increase up to 102.1 m³/h.  I do have a 140mm fan I could experiment with, but the pressure drops.  Almost everything I 3D print is for mining purposes.

https://imgur.com/a/gidpBJ8

Our (cryptocloaks) space heater replaces an s9’s psu fan and miner 120mm with 140mm fans - and it stays pretty quiet after that. Around 45-50 dB

If it helps, the fan we used:

Noctua NF-A14 iPPC-3000 PWM, Heavy Duty Cooling Fan, 4-Pin, 3000 RPM (140mm, Black)

 https://a.co/d/6r1YEdt

I was thinking about ways to push this beyond the 2.4-2.5Th reported by other users.
One way could be to use a bigger fan and adapter to funnel more air CFMs into the pod.
For example a 120mm or 140 mm fan can push 2-3x air through the heatsinks, while still staying fairly quiet (<25db).
I've seen some s9 space heater designs (skip to page 9) that are replacing the stock 120mm fan with 140mm fan to allow the machine to run quietly without compromising on cooling.

Would like to know from others here, if this makes sense and is worth a try.

-Aviral

Whatever you use, there are 2 formats

"ascset|1,chip,0:0"
or
'{"command":"ascset","parameter":"1,chip,0:0"}'

(aside: I designed and wrote the cgminer API)

I did take all apart it has pads 20w/mk 0.5mm i replaced with new same specs.

Confirmed also here:
https://bitcointalksearch.org/topic/m.61628663

Not sure if this answers your question or not, but it seems similar:

https://bitcointalksearch.org/topic/m.61628663