Bitmain launches the Z9 Equihash miner - page 25.

AriesIV10

legendary

Activity: 1260

Merit: 1006

Mine for a Bit

Quote from: Angelob on August 05, 2018, 11:11:25 PM

Quote from: AriesIV10 on August 05, 2018, 03:34:42 PM

Quote from: scott85213 on August 05, 2018, 01:25:13 PM

Quote from: AriesIV10 on August 04, 2018, 06:53:25 PM

Has anyone done any research on reversing the airflow? AND even putting the fan on the other end and pulling the air through?

https://bitcointalksearch.org/topic/m.43446447

Re: Z9 list of working pools/Fork updates
Today at 04:55:03 AM
Reply with quote +Merit #637
Quote from: greyday on Today at 03:42:17 AM
Quote from: acidrush on Today at 03:29:55 AM
Quote from: Sprucemoose78 on Today at 03:26:07 AM
Quote from: xxoanser on August 03, 2018, 09:06:20 AM

I only reversed the airflow

My temps at 750mhz:
Before: 67-71° at 80%
Now: 54-59 at 70%

Is it possible that your fan had been set the wrong way from the factory? Can you confirm which direction the air flows now after you switched? And how about sound, did it change in any way (especially the pitch)?

The fan used to suck air in, now its blowing out. Speed is about 1k rpm less.

To avoid confusion, it pushed air in, now it is pulling air out, correct?

correct

I actually just tried this out and now my fan is pulling air out (blowing out and not through the machine) and my PCB temps dropped 9-11 degrees per PCB and about 4-6 degrees per chip. Fan on auto also it spinning about 1k RPM lower and doesn't do the constant up and down ramping when I had it the other way. Seems strange they wouldn't try this configuration and ship it that way...

Pulling air is a better method of cooling. Proven in data centers, A/C units,.. I will be moving my fans to the back of the unit and the blank metal plate to the front of the unit in my data center on Tuesday and give a report on it.

A/C units pull air because the coil is very close and larger than the fan and an even air flow through the coil is desired.

Also be carefull when pulling air over uneven coil as in the Z9 mini, the air will flow more with the least resistance areas, if you push air and the coil/ fins are close like the Z9, the static pressured air will not have time to find another course through the fins. In other words its better to push in on the Z9.

[/quote]

I just took the Z9minis and put them into the garage with the fan on the back end. The first two are of them running with the fan on the front pushing the air (original). The second two are them running with the fan on the back pulling the air through.

---FAN ON THE FRONT---

---FAN ON THE BACK---

minefarmbuy

full member

Activity: 1022

Merit: 221

We are not retail.

Quote from: vincl on August 07, 2018, 08:20:54 AM

Quote from: BitoshiBulg on August 07, 2018, 08:07:52 AM

Nowadays, mining from Bulgaria, how long will I have the return on investment in this equipment? I was quite interested in acquiring, but I need to know if it's worth it.

if you ask questions like this, mining is not for you

Technically, if you ask questions like this you should do more research on mining. Then decide.

There're lot's of sites dedicated to calculating profits out there. Whattomine.com is a good starting place for most.

Nivaria

newbie

Activity: 7

Merit: 0

Quote from: vincl on August 07, 2018, 08:20:54 AM

Quote from: BitoshiBulg on August 07, 2018, 08:07:52 AM

Nowadays, mining from Bulgaria, how long will I have the return on investment in this equipment? I was quite interested in acquiring, but I need to know if it's worth it.

if you ask questions like this, mining is not for you

+1

vincl

member

Activity: 386

Merit: 18

Quote from: BitoshiBulg on August 07, 2018, 08:07:52 AM

Nowadays, mining from Bulgaria, how long will I have the return on investment in this equipment? I was quite interested in acquiring, but I need to know if it's worth it.

if you ask questions like this, mining is not for you

BitoshiBulg

newbie

Activity: 1

Merit: 0

Nowadays, mining from Bulgaria, how long will I have the return on investment in this equipment? I was quite interested in acquiring, but I need to know if it's worth it.

Angelob

newbie

Activity: 9

Merit: 3

Quote from: Nivaria on August 07, 2018, 06:51:06 AM

Has anyone tried to put second fan for extraction?

What do you want to achieve, cooler chips, less noise or both, then put one of these on the fan end. Grin

Look at this on eBay
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F192612612089

Nivaria

newbie

Activity: 7

Merit: 0

Has anyone tried to put second fan for extraction?

Angelob

newbie

Activity: 9

Merit: 3

Quote from: d.v. on August 05, 2018, 11:53:07 PM

Quote from: Angelob on August 05, 2018, 07:54:22 PM

Sorry to burst your bubble, but you are creating false readings and you are putting stress on the unit.

There are 4 chips on each board and 3 x boards, total of 12 chips, the sensor is on the last chip to the rear bottom of each board, the other 3 chips on the board are at the front near the fan, if you reverse the fan the sensored chip is getting cold air first and the other 3 chips on the board are getting hotter air, also the senor pcb is getting fresh air first, not good scenario for the 3 unsensord chips which is now hotter than the sensored chip and the fan is not activating to their real temps.

Normally they are always cooler than the sensored chip and have no need to be monitored.

this makes perfect sense if the hardware architecture was built like this. in this case, with the reversed airflow, the lower temp reading is fooling the control board to slow down the fan therefore cooling the 3 other chips less than required so for all we know, the 4th chip (with the sensor) is fine while the other 3 is roasting away...

Furthermore if you look at the fan speed, chip and pcb temps they don't add up, the fan is running way to high for the temps, I would suggest that the fan is not able to pick up the air, being blocked by the heat sink fins, this would create a vacume and in turn free reving with minimal load, or i am missing something else but i dont think so.

d.v.

jr. member

Activity: 48

Merit: 4

Quote from: Angelob on August 05, 2018, 07:54:22 PM

Sorry to burst your bubble, but you are creating false readings and you are putting stress on the unit.

There are 4 chips on each board and 3 x boards, total of 12 chips, the sensor is on the last chip to the rear bottom of each board, the other 3 chips on the board are at the front near the fan, if you reverse the fan the sensored chip is getting cold air first and the other 3 chips on the board are getting hotter air, also the senor pcb is getting fresh air first, not good scenario for the 3 unsensord chips which is now hotter than the sensored chip and the fan is not activating to their real temps.

Normally they are always cooler than the sensored chip and have no need to be monitored.

this makes perfect sense if the hardware architecture was built like this. in this case, with the reversed airflow, the lower temp reading is fooling the control board to slow down the fan therefore cooling the 3 other chips less than required so for all we know, the 4th chip (with the sensor) is fine while the other 3 is roasting away...

Angelob

newbie

Activity: 9

Merit: 3

Quote from: AriesIV10 on August 05, 2018, 03:34:42 PM

Quote from: scott85213 on August 05, 2018, 01:25:13 PM

Quote from: AriesIV10 on August 04, 2018, 06:53:25 PM

Has anyone done any research on reversing the airflow? AND even putting the fan on the other end and pulling the air through?

https://bitcointalksearch.org/topic/m.43446447

Re: Z9 list of working pools/Fork updates
Today at 04:55:03 AM
Reply with quote +Merit #637
Quote from: greyday on Today at 03:42:17 AM
Quote from: acidrush on Today at 03:29:55 AM
Quote from: Sprucemoose78 on Today at 03:26:07 AM
Quote from: xxoanser on August 03, 2018, 09:06:20 AM

https://preview.ibb.co/modtYz/IMG_20180803_090110.jpg
https://preview.ibb.co/nCEHtz/Screenshot_2018_08_03_08_55_10_483_com_android_chrome.png

I only reversed the airflow

My temps at 750mhz:
Before: 67-71° at 80%
Now: 54-59 at 70%

Is it possible that your fan had been set the wrong way from the factory? Can you confirm which direction the air flows now after you switched? And how about sound, did it change in any way (especially the pitch)?

The fan used to suck air in, now its blowing out. Speed is about 1k rpm less.

To avoid confusion, it pushed air in, now it is pulling air out, correct?

correct

I actually just tried this out and now my fan is pulling air out (blowing out and not through the machine) and my PCB temps dropped 9-11 degrees per PCB and about 4-6 degrees per chip. Fan on auto also it spinning about 1k RPM lower and doesn't do the constant up and down ramping when I had it the other way. Seems strange they wouldn't try this configuration and ship it that way...

Pulling air is a better method of cooling. Proven in data centers, A/C units,.. I will be moving my fans to the back of the unit and the blank metal plate to the front of the unit in my data center on Tuesday and give a report on it.

[/quote]
A/C units pull air because the coil is very close and larger than the fan and an even air flow through the coil is desired.

Also be carefull when pulling air over uneven coil as in the Z9 mini, the air will flow more with the least resistance areas, if you push air and the coil/ fins are close like the Z9, the static pressured air will not have time to find another course through the fins. In other words its better to push in on the Z9.

Angelob

newbie

Activity: 9

Merit: 3

Quote from: AriesIV10 on August 04, 2018, 06:53:25 PM

Has anyone done any research on reversing the airflow? AND even putting the fan on the other end and pulling the air through?

https://bitcointalksearch.org/topic/m.43446447

Re: Z9 list of working pools/Fork updates
Today at 04:55:03 AM
Reply with quote +Merit #637
Quote from: greyday on Today at 03:42:17 AM
Quote from: acidrush on Today at 03:29:55 AM
Quote from: Sprucemoose78 on Today at 03:26:07 AM
Quote from: xxoanser on August 03, 2018, 09:06:20 AM

https://preview.ibb.co/modtYz/IMG_20180803_090110.jpg
https://preview.ibb.co/nCEHtz/Screenshot_2018_08_03_08_55_10_483_com_android_chrome.png

I only reversed the airflow

My temps at 750mhz:
Before: 67-71° at 80%
Now: 54-59 at 70%

Is it possible that your fan had been set the wrong way from the factory? Can you confirm which direction the air flows now after you switched? And how about sound, did it change in any way (especially the pitch)?

The fan used to suck air in, now its blowing out. Speed is about 1k rpm less.

To avoid confusion, it pushed air in, now it is pulling air out, correct?

correct

Sorry to burst your bubble, but you are creating false readings and you are putting stress on the unit.

There are 4 chips on each board and 3 x boards, total of 12 chips, the sensor is on the last chip to the rear bottom of each board, the other 3 chips on the board are at the front near the fan, if you reverse the fan the sensored chip is getting cold air first and the other 3 chips on the board are getting hotter air, also the senor pcb is getting fresh air first, not good scenario for the 3 unsensord chips which is now hotter than the sensored chip and the fan is not activating to their real temps.

Normally they are always cooler than the sensored chip and have no need to be monitored.

ltcsprite

full member

Activity: 269

Merit: 101

Quote from: ruplikminer on August 05, 2018, 04:41:55 PM

Ok. I have bought one of these Z9 Mini from a shop that had it with immediate shipping for 899 usd. We'll see how much I can make and if I can ROI or not

Hopefully you don't get scammed.

Have seen dozens of people get scammed on Ebay in the past 2 weeks sending money in bitcoin to a compromised Ebay seller account selling nonexistent Z9 minis.

Saw a guy the other day sell 12 of them before his auction got shutdown, he got .5 BTC in like 2 hours and those people are all shit out of luck as bitcoin isn't a legit payment method on Ebay. (No Buyer Protection)

Example:

https://www.ebay.com/itm/-/153127558037?nordt=true&orig_cvip=true&rt=nc&_trksid=p2047675.l10137

d.v.

jr. member

Activity: 48

Merit: 4

Quote from: ruplikminer on August 05, 2018, 04:41:55 PM

Ok. I have bought one of these Z9 Mini from a shop that had it with immediate shipping for 899 usd. We'll see how much I can make and if I can ROI or not

what shop? do share... or did you get scammed?

ruplikminer

jr. member

Activity: 504

Merit: 3

Ok. I have bought one of these Z9 Mini from a shop that had it with immediate shipping for 899 usd. We'll see how much I can make and if I can ROI or not

ruplikminer

jr. member

Activity: 504

Merit: 3

Quote from: roc-noc on August 05, 2018, 12:31:01 PM

Quote from: ruplikminer on August 05, 2018, 11:15:57 AM

what will happen with the next Z9 batch will be realeased at the beginning of SEptember?

Difficulty goes up, profit goes down.

Beginning of Sept includes wave 2 of the z9 minis. Wave 1 was priced at $2100 and they shipped about 8,000 units. Wave 2 selling at $850 - my guess is 25,000 units. Plus Z9 shipping Sept selling for $3300. I'm guessing 4 times z9 mini power but not clear. That should keep the sales lower until they are proven. I'm guessing 2000 units sold. More sold once proven.

I think profit will be 50% lower than today by end of September and will continue to follow the curve down.

I Was thinkin to get a couple of the Z9 Mini but I am not sure if I can ROI with the second batch...

AriesIV10

legendary

Activity: 1260

Merit: 1006

Mine for a Bit

Quote from: scott85213 on August 05, 2018, 01:25:13 PM

Quote from: AriesIV10 on August 04, 2018, 06:53:25 PM

Has anyone done any research on reversing the airflow? AND even putting the fan on the other end and pulling the air through?

https://bitcointalksearch.org/topic/m.43446447

Re: Z9 list of working pools/Fork updates
Today at 04:55:03 AM
Reply with quote +Merit #637
Quote from: greyday on Today at 03:42:17 AM
Quote from: acidrush on Today at 03:29:55 AM
Quote from: Sprucemoose78 on Today at 03:26:07 AM
Quote from: xxoanser on August 03, 2018, 09:06:20 AM

I only reversed the airflow

My temps at 750mhz:
Before: 67-71° at 80%
Now: 54-59 at 70%

Is it possible that your fan had been set the wrong way from the factory? Can you confirm which direction the air flows now after you switched? And how about sound, did it change in any way (especially the pitch)?

The fan used to suck air in, now its blowing out. Speed is about 1k rpm less.

To avoid confusion, it pushed air in, now it is pulling air out, correct?

correct

I actually just tried this out and now my fan is pulling air out (blowing out and not through the machine) and my PCB temps dropped 9-11 degrees per PCB and about 4-6 degrees per chip. Fan on auto also it spinning about 1k RPM lower and doesn't do the constant up and down ramping when I had it the other way. Seems strange they wouldn't try this configuration and ship it that way...

Pulling air is a better method of cooling. Proven in data centers, A/C units,.. I will be moving my fans to the back of the unit and the blank metal plate to the front of the unit in my data center on Tuesday and give a report on it.

scott85213

newbie

Activity: 2

Merit: 2

Quote from: AriesIV10 on August 04, 2018, 06:53:25 PM

Has anyone done any research on reversing the airflow? AND even putting the fan on the other end and pulling the air through?

https://bitcointalksearch.org/topic/m.43446447

Re: Z9 list of working pools/Fork updates
Today at 04:55:03 AM
Reply with quote +Merit #637
Quote from: greyday on Today at 03:42:17 AM
Quote from: acidrush on Today at 03:29:55 AM
Quote from: Sprucemoose78 on Today at 03:26:07 AM
Quote from: xxoanser on August 03, 2018, 09:06:20 AM

https://preview.ibb.co/modtYz/IMG_20180803_090110.jpg
https://preview.ibb.co/nCEHtz/Screenshot_2018_08_03_08_55_10_483_com_android_chrome.png

I only reversed the airflow

My temps at 750mhz:
Before: 67-71° at 80%
Now: 54-59 at 70%

Is it possible that your fan had been set the wrong way from the factory? Can you confirm which direction the air flows now after you switched? And how about sound, did it change in any way (especially the pitch)?

The fan used to suck air in, now its blowing out. Speed is about 1k rpm less.

To avoid confusion, it pushed air in, now it is pulling air out, correct?

correct

I actually just tried this out and now my fan is pulling air out (blowing out and not through the machine) and my PCB temps dropped 9-11 degrees per PCB and about 4-6 degrees per chip. Fan on auto also it spinning about 1k RPM lower and doesn't do the constant up and down ramping when I had it the other way. Seems strange they wouldn't try this configuration and ship it that way...

roc-noc

jr. member

Activity: 95

Merit: 4

Quote from: ruplikminer on August 05, 2018, 11:15:57 AM

what will happen with the next Z9 batch will be realeased at the beginning of SEptember?

Difficulty goes up, profit goes down.

Beginning of Sept includes wave 2 of the z9 minis. Wave 1 was priced at $2100 and they shipped about 8,000 units. Wave 2 selling at $850 - my guess is 25,000 units. Plus Z9 shipping Sept selling for $3300. I'm guessing 4 times z9 mini power but not clear. That should keep the sales lower until they are proven. I'm guessing 2000 units sold. More sold once proven.

I think profit will be 50% lower than today by end of September and will continue to follow the curve down.

ruplikminer

jr. member

Activity: 504

Merit: 3

what will happen with the next Z9 batch will be realeased at the beginning of SEptember?

juminem23

newbie

Activity: 28

Merit: 0

maybe actual devs will follow the monero's plan, a brand new asic for the algo i exploit? easy, fork to trade the algo, guys remember we need genuine decentralization in this international, if now not, satoshi create btc only to look how we (dumb human beings) destroy a whole new freedom manner to a brand new financial machine. i imply, we like money, however will we need to be at the same nation like banks make us belive we own our money? due to the fact thats what theyr trying to do, centralize the hashpower like they centralize all the actual financial gadget. fuck bitmain and asics.

Topic: Bitmain launches the Z9 Equihash miner - page 25. (Read 37201 times)