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Author Topic: Swedish ASIC miner company kncminer.com  (Read 3012225 times)
samsonn25
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June 19, 2014, 10:37:48 PM
 #35221

YES.  Especially after they pocket 12k  per miner.

Even average high end gpu pulling 250-300 watts has 2 power connectors.
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faetos
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gotta let a coin be a coin


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June 19, 2014, 10:48:12 PM
 #35222

my surprised face on ppl just now figuring out how cheap and crappy knc are:

 :|
Biodom
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June 19, 2014, 10:50:35 PM
 #35223


Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

OK, so 6 pinsx8A=48AX12=576W per each PCIe cable max?
To me it sounds a bit too much, or maybe not each pin (out of 6) counts?
I am very far from being an electrical engineer, sorry.
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June 19, 2014, 10:57:17 PM
 #35224


Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

OK, so 6 pinsx8A=48AX12=576W per each PCIe cable max?
To me it sounds a bit too much, or maybe not each pin (out of 6) counts?
I am very far from being an electrical engineer, sorry.


Each PCIe connector has three 12v wire 'pairs' i.e. one hot line (yellow) with associated ground wire when connected.  This then yields 3 pins at 8A which is 24A@12V= 288W per connector at rated max.  Where does the rest of the power come from or is it even needed is the question?

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samsonn25
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June 19, 2014, 11:00:50 PM
 #35225

Even 8 pin connector is only 384 watts.
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June 19, 2014, 11:19:34 PM
 #35226

Even 8 pin connector is only 384 watts.

But to get to that rating you have to custom wire the connector. Standard PSUs only have 3 hot wires, even on a 8-pin connector. 288w is the limit.

Buy & Hold
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June 19, 2014, 11:21:01 PM
 #35227

Even 8 pin connector is only 384 watts.

Actually the 8 pin ones still only have 3 yellow so you are still limited to 3x8, why the pci-e standard calls for extra ground cables on the 8 pin I'm not sure (less load on motherboard ground perhaps?)
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June 19, 2014, 11:29:31 PM
 #35228


Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

OK, so 6 pinsx8A=48AX12=576W per each PCIe cable max?
To me it sounds a bit too much, or maybe not each pin (out of 6) counts?
I am very far from being an electrical engineer, sorry.


Each PCIe connector has three 12v wire 'pairs' i.e. one hot line (yellow) with associated ground wire when connected.  This then yields 3 pins at 8A which is 24A@12V= 288W per connector at rated max.  Where does the rest of the power come from or is it even needed is the question?

^^^This sums it up perfectly.
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June 19, 2014, 11:39:45 PM
 #35229


Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

OK, so 6 pinsx8A=48AX12=576W per each PCIe cable max?
To me it sounds a bit too much, or maybe not each pin (out of 6) counts?
I am very far from being an electrical engineer, sorry.


Each PCIe connector has three 12v wire 'pairs' i.e. one hot line (yellow) with associated ground wire when connected.  This then yields 3 pins at 8A which is 24A@12V= 288W per connector at rated max.  Where does the rest of the power come from or is it even needed is the question?

^^^This sums it up perfectly.


Nah you forgot this,

Bogart
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June 20, 2014, 12:07:52 AM
 #35230



This was on one of my CoinCraft Desk modules, which draws around 200W.

Replacing the connectors was a pain in the butt.  It took me about 4 hours from start to finish.

"All safe deposit boxes in banks or financial institutions have been sealed... and may only be opened in the presence of an agent of the I.R.S." - President F.D. Roosevelt, 1933
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June 20, 2014, 12:14:13 AM
 #35231


<snip>

Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

Molex has several series of minifit jr connectors. Their HCS series is spec'd in at 13A per pin: http://www.molex.com/molex/products/family?key=minifit_plus_connector_system&channel=products&chanName=family&pageTitle=Introduction&parentKey=minifit_products

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samsonn25
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June 20, 2014, 12:16:26 AM
 #35232

I was thinking that too.  Also is it a real mole or copy brand.  That goes for the metal connector and also the quality of the plastic for the housing.
Soros Shorts
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June 20, 2014, 12:23:43 AM
 #35233

BitFury rig: the long term effect of running 550 watts through 2 x PCI-e 6-pin connectors. The quick repair job was to solder the wires from 4 x 6-pin connectors directly to the bottom of board and this has worked fine since.

Biodom
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June 20, 2014, 12:23:58 AM
 #35234

http://i.imgur.com/DBCIP95.jpg

This was on one of my CoinCraft Desk modules, which draws around 200W.

Replacing the connectors was a pain in the butt.  It took me about 4 hours from start to finish.

It's entirely possible that it simply got 'cooked' by the heat sink rather than the current.


<snip>

Molex (company making the pci-e power connectors) dictates the max spec per pin to 8A according to an earlier posted PDF, so 400W is outside even the most optimistic estimates! Not saying it wont work, but why are they even gambling with this when it would cost them a few bucks tops to use 2 of them.

Molex has several series of minifit jr connectors. Their HCS series is spec'd in at 13A per pin: http://www.molex.com/molex/products/family?key=minifit_plus_connector_system&channel=products&chanName=family&pageTitle=Introduction&parentKey=minifit_products

Re Molex at 13A-I wonder which companies PCIe connectors are rated this high. There is no info on EVGA1300 or Corsair pins as far as I could find.
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June 20, 2014, 12:24:37 AM
 #35235


Molex makes a crapload of connectors, many of which can handle current up to these levels, but the real question is: are they keyed to PCI-E?  And in the event they're keyed to PCI-E are the PCI-E plugs on the PSU rated for those power levels?  It's unlikely.  

The bottom line is that it adds negligible BOM and assembly costs to double up the PCI-E connectors on the boards.  Hell, even the original AM cubes had 2 PCI-E plugs and it only consumed ~320W OC'd.  Cutting costs and/or poor choices in something as simple as this makes me wonder what other kind of issues are going to crop up with the design.  People can sit here and argue until they're blue in the face as to whether it can or can't theoretically handle the power, but cheaping out and assuming that kind of liability is absolutely stupid.  If someone's house burns down, the sign-off Engineer can be personally liable for the bad design.  It's that simple.  If you want to take the risk of having FIVE of these potential fire hazards running in a closet in your house unmonitored 24/7 then be my guest, but I strongly recommend against it.

Biodom
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June 20, 2014, 12:27:23 AM
 #35236


Molex makes a crapload of connectors, many of which can handle current up to these levels, but the real question is: are they keyed to PCI-E?  And in the event they're keyed to PCI-E are the PCI-E plugs on the PSU rated for those power levels?  It's unlikely.  

The bottom line is that it adds negligible BOM and assembly costs to double up the PCI-E connectors on the boards.  Hell, even the original AM cubes had 2 PCI-E plugs and it only consumed ~320W OC'd.  Cutting costs and/or poor choices in something as simple as this makes me wonder what other kind of issues are going to crop up with the design.  People can sit here and argue until they're blue in the face as to whether it can or can't theoretically handle the power, but cheaping out and assuming that kind of liability is absolutely stupid.  If someone's house burns down, the sign-off Engineer can be personally liable for the bad design.  It's that simple.  If you want to take the risk of having FIVE of these potential fire hazards running in a closet in your house unmonitored 24/7 then be my guest, but I strongly recommend against it.



^I totally agree, even upcoming 390W S3 has four PCIe connectors.
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June 20, 2014, 12:57:53 AM
 #35237

It feels so f***ing great that I made the only logical choice and asked for a refund.
There are some really delusional people in this thread thinking that waiting for the Neptune is a good thing.
A Neptune will never mine 22BTC, NEVER.
Most customers will start mining at over 15 billion difficulty.

Btw I remember back in November when I ordered mine I was expecting difficulty to be at around 10 billion maximum, but then again I was expecting delivery in April/May.

If this post helped you and you feel generous you know what to do: 1P9tXFy9bVgzrfPGeV7F8np26ZtFdCCWvz
faetos
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gotta let a coin be a coin


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June 20, 2014, 01:09:03 AM
 #35238

It feels so f***ing great that I made the only logical choice and asked for a refund.
There are some really delusional people in this thread thinking that waiting for the Neptune is a good thing.
A Neptune will never mine 22BTC, NEVER.
Most customers will start mining at over 15 billion difficulty.

Btw I remember back in November when I ordered mine I was expecting difficulty to be at around 10 billion maximum, but then again I was expecting delivery in April/May.

I thought it would only be 2-3 billion and I really thought I would get it in April, too. As soon as Bitcoinorama let loose they were still in the design phase in Feb and realized they had done absolutely nothing in Nov and Dec. I knew then that 'ol Avenger was right and Q1 was a marketing ploy. Punched out and turned the refund into a house. Much more enjoyable experience than what you folks are going to go through. I really just hope that no one gets hurt from these BBQ boxes. It's one thing to bring out that gimp and really f' your customers, but it's another thing altogether if a fire breaks out and God forbid someone gets seriously hurt or killed.
1Neptune
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June 20, 2014, 01:20:12 AM
 #35239

It feels so f***ing great that I made the only logical choice and asked for a refund.
There are some really delusional people in this thread thinking that waiting for the Neptune is a good thing.
A Neptune will never mine 22BTC, NEVER.
Most customers will start mining at over 15 billion difficulty.

Btw I remember back in November when I ordered mine I was expecting difficulty to be at around 10 billion maximum, but then again I was expecting delivery in April/May.

I thought it would only be 2-3 billion and I really thought I would get it in April, too. As soon as Bitcoinorama let loose they were still in the design phase in Feb and realized they had done absolutely nothing in Nov and Dec. I knew then that 'ol Avenger was right and Q1 was a marketing ploy. Punched out and turned the refund into a house. Much more enjoyable experience than what you folks are going to go through. I really just hope that no one gets hurt from these BBQ boxes. It's one thing to bring out that gimp and really f' your customers, but it's another thing altogether if a fire breaks out and God forbid someone gets seriously hurt or killed.

No news heading to the end of March led me to begin the refund process then. I've seen nothing yet that makes me regret that choice.
xstr8guy
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June 20, 2014, 01:36:24 AM
 #35240

Maybe a bit off-topic but still relevant to the thread...

But what does "gimp" mean when used to describe the Neptune? I've always known it to mean handicapped. But does it have another meaning here?
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