Antminer Z9 mini overclocked

[Wasp0]

Just got my batch 2 Mini yesterday.  Ran it at 650 Mhz all night and had no HW errors and minimal pool rejects (using nanopool).  Getting around 14.8Ksol/s.  What's odd is I changed the cgminer.conf to set the speed to something higher but anything higher than 650 just gives me a really low hash rate, around 4.5Ksol/s, even 655 Mhz.  No HW errors, just slow hashing.  Anyone else experience this?

I noticed the Z9 mini seems to hash slowly unless you select speeds in specific increments. (usually 6 mhz) the only reason I know this is because after I experienced the same thing as you on my manually adjusted batch 2 mini, I looked at the OC options on my batch 1 mini and it looks like they usually let you select in increments of 6 or 7 mhz. I don't really know why but I'm guessing it's a memory timing thing. Try adjusting with the following exact increments until you get stability. 700, 693, 687, 681, 675, 668, 662, 650, etc.

Is that starting at 700 and going downwards or starting at 600 and going up? or does not make a difference?

[1715012533]

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[Tailgunner]

Just got my batch 2 Mini yesterday.  Ran it at 650 Mhz all night and had no HW errors and minimal pool rejects (using nanopool).  Getting around 14.8Ksol/s.  What's odd is I changed the cgminer.conf to set the speed to something higher but anything higher than 650 just gives me a really low hash rate, around 4.5Ksol/s, even 655 Mhz.  No HW errors, just slow hashing.  Anyone else experience this?

I noticed the Z9 mini seems to hash slowly unless you select speeds in specific increments. (usually 6 mhz) the only reason I know this is because after I experienced the same thing as you on my manually adjusted batch 2 mini, I looked at the OC options on my batch 1 mini and it looks like they usually let you select in increments of 6 or 7 mhz. I don't really know why but I'm guessing it's a memory timing thing. Try adjusting with the following exact increments until you get stability. 700, 693, 687, 681, 675, 668, 662, 650, etc.

Is that starting at 700 and going downwards or starting at 600 and going up? or does not make a difference?

It doesn't matter technically. but I would Just start from the highest and as soon as 1 hashboard crashes restart and drop it to the next highest and repeat so you can quickly find the maximum stable. It may take 12-24 hours until it faults out so don't assume it's stable after just a few minutes.

[htautosjay]

If we crack open the firmware, can we adjust the individual board frequency ??

If you have a Batch one mini that is over clocked, set this to the freq you want the new one set to, save config file, then upload that config file into the batch 2 mini.

tinkering with Firmware is WOW! spookily freakingly scary!

I have a batch 1 Z9 Mini Il give it a wizz
report back

[htautosjay]

If we crack open the firmware, can we adjust the individual board frequency ??

If you have a Batch one mini that is over clocked, set this to the freq you want the new one set to, save config file, then upload that config file into the batch 2 mini.

tinkering with Firmware is WOW! spookily freakingly scary!

I have a batch 1 Z9 Mini Il give it a wizz
report back

no difference, i uploaded the May 18 firmware onto my batch 2 z9's on arrival.. worth a shot.. but still dropping a chip on board 2 

[htautosjay]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

[Wasp0]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

Wow man feel sorry for you. Can you get a replacement board?

[TGJ]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

When you say “have a chip blow out”, do you mean the board is fried?

[htautosjay]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

When you say “have a chip blow out”, do you mean the board is fried?

no just goes from 0000 to 0x000 not burnt out just stopped working

[htautosjay]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

Wow man feel sorry for you. Can you get a replacement board?

thing is it works ar 500 freq fine ... just when i OC it it fails, Bitmain will want a screenshot showing the failure.. and i cant give them a overlocked screenshot ...emmmmmmm 

[htautosjay]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

Wow man feel sorry for you. Can you get a replacement board?

thing is it works ar 500 freq fine ... just when i OC it it fails, Bitmain will want a screenshot showing the failure.. and i cant give them a overlocked screenshot ...emmmmmmm  

If there is a way to set the freq of the boards individually say board 1 at 675 board 2 at 550 and board 3 at 675 ??... any ideas??

[shehz81]

Just had another Z9 Mini that arrived today have a chip blow out (x000) when Oc'd to 668 seems that the late batch 2 machines dont just stop hashing when Oc'd too much they loose a chip

Wow man feel sorry for you. Can you get a replacement board?

thing is it works ar 500 freq fine ... just when i OC it it fails, Bitmain will want a screenshot showing the failure.. and i cant give them a overlocked screenshot ...emmmmmmm  

If there is a way to set the freq of the boards individually say board 1 at 675 board 2 at 550 and board 3 at 675 ??... any ideas??

Did you come up with any solution yet?

I'm having similar issue. I haven't looked hard enough to see if one of the chip fails but when I over clocked my second batch to 668, it would give me decent hash rate between 14-16k for few hours but then the hash rate would drop to 9k. So I'm guessing it must be the chip failure. This happened multiple times and I started with 700. Now I have further reduced it to 650. Crossing my fingers. Interestingly to OC, I just had to pick the frequency from the drop down options.

My Second z9 from the second batch, I had to overclock differently because the option wasn't there and that has been more stable at 675 frequency than the one which had the drop down option to change the frequency!

 

[fliperone]

If we crack open the firmware, can we adjust the individual board frequency ??

If you have a Batch one mini that is over clocked, set this to the freq you want the new one set to, save config file, then upload that config file into the batch 2 mini.

tinkering with Firmware is WOW! spookily freakingly scary!

I have a batch 1 Z9 Mini Il give it a wizz
report back

no difference, i uploaded the May 18 firmware onto my batch 2 z9's on arrival.. worth a shot.. but still dropping a chip on board 2 

Hey htautosjay. Wanted to ask you if you had a copy of the first batch firmware from bitmain support site? I did not DL it back then and now they replaced it. PM me if you willing to share mate. Lets see if there is some difference in Voltage settings that makes it less stable. Although Im afraid its simply lower quality chips as I measured power draw for 4x Z9mini from 1st batch @700 and now 4x 2nd batch @687. Results are 1493 W vs. 1530 W. There might be a small diff due to different PSU eff but never that big!

[htautosjay]

If we crack open the firmware, can we adjust the individual board frequency ??

If you have a Batch one mini that is over clocked, set this to the freq you want the new one set to, save config file, then upload that config file into the batch 2 mini.

tinkering with Firmware is WOW! spookily freakingly scary!

I have a batch 1 Z9 Mini Il give it a wizz
report back

no difference, i uploaded the May 18 firmware onto my batch 2 z9's on arrival.. worth a shot.. but still dropping a chip on board 2  

Hey htautosjay. Wanted to ask you if you had a copy of the first batch firmware from bitmain support site? I did not DL it back then and now they replaced it. PM me if you willing to share mate. Lets see if there is some difference in Voltage settings that makes it less stable. Although Im afraid its simply lower quality chips as I measured power draw for 4x Z9mini from 1st batch @700 and now 4x 2nd batch @687. Results are 1493 W vs. 1530 W. There might be a small diff due to different PSU eff but never that big!

Deffo yes mate il pm you now.. i have batch 1 firmware standard and batch 1 from my 17 sol batch 1 Z9.
I have been searching through the firmware for voltage, but cant find it... also in the kernel log it says for some weird reason set freq to 750.. This is even when i have the freq set at 600... no where have i set freq to 750 but the firmware is doing some strange things.. i think its either temp or as you say power..
 

[imine2]

firmware:
Batch 1
z9 mini

File: Antminer-Z9-Mini-201805262047-500M.tar.gz
sha-1: 8791eee569dfff728c8363e5d8fd93f68957a2ee

http://ftp://file.bitmain.com/shop-bitmain/firmwares/Antminer%20Z9%20mini/Firmware/Antminer-Z9-Mini-201805262047-500M.tar.gz

(There should NOT be a "http://" before the link! I can't see the "http://" when editing)


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[htautosjay]

firmware:
Batch 1
z9 mini

https://service.bitmain.com/support/download?product=Antminer%20Z9%20mini

direct link:
https://file11.bitmain.com/shop-product/firmware/Antminer-Z9-Mini-201805262047-500M.tar.gz

Hope this will help anyone!

I don't have batch 2 yet!

Yep, that's the (May 2018)  Z9 Mini Firmware.. If you just flash that onto a miner that has the balance feature it has the drop down box like batch 1
Cool mate good add 

[rackserver]

anybody knows how to set the voltage for the ASIC chips? (for all of them at the same time, or per board, or per chip?)
thanks guys

[imine2]

is it possible to unplug 2 boards and start with only one board at a time?

that way you could try to find out what each board(PCB) can do?

Don't know if this could help somehow?

[Wasp0]

firmware:
Batch 1
z9 mini

https://service.bitmain.com/support/download?product=Antminer%20Z9%20mini

direct link:
https://file11.bitmain.com/shop-product/firmware/Antminer-Z9-Mini-201805262047-500M.tar.gz

Hope this will help anyone!

I don't have batch 2 yet!

Brilliant, thanks imine2. Have not worked out how to give 'Rep' or what ever it is called on here yet, but when i do i will 'Rep' you. Us Newb's can't seem to do much on here

[htautosjay]

is it possible to unplug 2 boards and start with only one board at a time?

that way you could try to find out what each board(PCB) can do?

Don't know if this could help somehow?

Its not advisable to plug powered connectors into yoiur boards , it can give them a spark that could pop something. text book start up is PSU off plug in boards and power up machine then plug in control board.. least i think  that's how the Bitmain site says to do it.. i just personally plug all the connectors in then power up the PSU

[Wasp0]

is it possible to unplug 2 boards and start with only one board at a time?

that way you could try to find out what each board(PCB) can do?

Don't know if this could help somehow?

Its not advisable to plug powered connectors into yoiur boards , it can give them a spark that could pop something. text book start up is PSU off plug in boards and power up machine then plug in control board.. least i think  that's how the Bitmain site says to do it.. i just personally plug all the connectors in then power up the PSU

Yes that's correct, i work in IT, and that is pretty much standard way to power any IT equipment. Thinking about it, it is pretty much standard to use ANY electrical equipment, but more so in any IT gear as the circuit boards are hypersensitive to voltage spikes/surges.