It's quite possible that this ongoing consternation of how many PCIe power connectors are needed relates to your interpretation of the PCIe specification for the power connector. I think the original spec only REQUIRED that two of the +12V lines be present. All three of the GND wires were required, but it was perfectly "legal" to only have two +12V lines. So if you interpret the PCIe spec very conservatively, 3 connectors would guarantee that there were 6 actual +12V pins.
Of course virtually no PSU vendor did that so, all three +12V pins carry current these days. So with two PCIe connectors on a current PSU, you get 6 conductors, which is the same as three "legal" PCIe connectors.
Since they don't want you to have more than one +12V rail for a blade, I think that's a pretty clear indication they are all joined in parallel on the board. In addition, things still work well, even if one of the pins has a marginal crimp, or just fits poorly, if all the connectors are used.
Topic: 1300W PSU only 8 PCI cables but I need 10! (Read 1563 times)
Here's a better figure of ampacity for stranded cabling in DC setting: http://www.westmarine.com/WestAdvisor/Marine-Wire-Size-And-Ampacity
More importantly however, the connectors used for PCIe (Molex mini-fit JR: http://www.molex.com/pdm_docs/ps/PS-5556-001.pdf) specify a maximum amperage of 8-9A per 16awg circuit in a 3-powered-circuit connector, depending on the type of pins used. Or, 288-324W maximum per connector.
They are also rated to a maximum of 105*C (including a maximum 30*C temperature rise over ambient for the connector).
Edit: To answer your question, Bitmain "requires" that all 3 PCIe sockets are used per hashing board. Each hashing board on an S7 draws somewhere around 360-370W DC, so with proper 16awg cabling (Scott's is good quality 16awg), if you were to use a splitter for 2x of the PCIe sockets to feel better about it (and be 100% sure not to violate warranty terms), you would be well within the safe range for amperage of the wiring and connectors/pins.
More importantly however, the connectors used for PCIe (Molex mini-fit JR: http://www.molex.com/pdm_docs/ps/PS-5556-001.pdf) specify a maximum amperage of 8-9A per 16awg circuit in a 3-powered-circuit connector, depending on the type of pins used. Or, 288-324W maximum per connector.
They are also rated to a maximum of 105*C (including a maximum 30*C temperature rise over ambient for the connector).
Edit: To answer your question, Bitmain "requires" that all 3 PCIe sockets are used per hashing board. Each hashing board on an S7 draws somewhere around 360-370W DC, so with proper 16awg cabling (Scott's is good quality 16awg), if you were to use a splitter for 2x of the PCIe sockets to feel better about it (and be 100% sure not to violate warranty terms), you would be well within the safe range for amperage of the wiring and connectors/pins.
Great, I also found out on the internet that a a 16AWG cable can handle up to 3.7 Amps
Source: http://www.answers.com/Q/How_much_current_can_a_16_gauge_wire_handle
Dunno where they got that answer from, but it's WAY on the low side.
16 AWG in most usage is good for at least 8 and possibly as high as 10 amps.
The national electric code doesn't go that low, but if you take their rating for 14 AWG (a VERY VERY conservitive 15 amps) and pro-rata for the relative circular mil area of a 14AWG to a 16AWG you get a much more accurate while still conservative figure.
I think they were talking about 16 awg for a splitter. For a 2 PCIe splitter to be exact. So it's not going to get anywhere near 10 amps.
But I think your thinking of the electric cord running, and they are saying for a splitter. So 2 different things.
Great, I also found out on the internet that a a 16AWG cable can handle up to 3.7 Amps
Source: http://www.answers.com/Q/How_much_current_can_a_16_gauge_wire_handle
Dunno where they got that answer from, but it's WAY on the low side.
16 AWG in most usage is good for at least 8 and possibly as high as 10 amps.
The national electric code doesn't go that low, but if you take their rating for 14 AWG (a VERY VERY conservitive 15 amps) and pro-rata for the relative circular mil area of a 14AWG to a 16AWG you get a much more accurate while still conservative figure.
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I've been turning away DPS2K sales all week on account of we're out of stock.
BAD timing.
8-O
The question is about your PSU cables. The answer, then, is also about your PSU cables. If your PSU has PCIe cables made from 16AWG wire, it should be okay. If your PSU has PCIe cables made from 18AWG wire, I'd say it's a poorly-thought-out design.
How can I know the quality of the cables? This is the product http://holybitcoin.com/product/holy-bundle/
Thanks for your time, Its getting clearer to me
Keep in mind that power supply is 1300w at 240v and only 910 at 120v.
Thats true, thanks for the heads up
The question is about your PSU cables. The answer, then, is also about your PSU cables. If your PSU has PCIe cables made from 16AWG wire, it should be okay. If your PSU has PCIe cables made from 18AWG wire, I'd say it's a poorly-thought-out design.
How can I know the quality of the cables? This is the product http://holybitcoin.com/product/holy-bundle/
Thanks for your time, Its getting clearer to me
Keep in mind that power supply is 1300w at 240v and only 910 at 120v.
I've been turning away DPS2K sales all week on account of we're out of stock. I had a choice to put money down on a new batch of boards or buy some new machinery, and since it took most of a year to sell the last batch of boards it didn't seem a good investment.
A pair of my 750W Dells load-balanced should run an S7 quite nicely. A single 1300W server supply should also do pretty well. You're right; a lot of supply kits are gonna get sold in the next month.
A pair of my 750W Dells load-balanced should run an S7 quite nicely. A single 1300W server supply should also do pretty well. You're right; a lot of supply kits are gonna get sold in the next month.
Dang I was honestly hoping some of those would go your way. I love that you have a good ethic twords how you treat people, and think highly so far of your products after testing the usb drive.
I can understand the decision. I think few were expecting them to keep S5+ design. I would have bet for sure it was going to keep 2 blade design. I do give bitmain credit on finding a way to make more choose their psu though. They are the other one to pick up sales from having 10 PCIe on S7.
I do fear how you mention junk wal-mart pci-e splitter. I fear some will try to save a few bucks and cheap cords will get hot and melt. I see that being a real issue if someone tries to go out to a store and get some of the off the shelf splitters.
I've been turning away DPS2K sales all week on account of we're out of stock. I had a choice to put money down on a new batch of boards or buy some new machinery, and since it took most of a year to sell the last batch of boards it didn't seem a good investment.
A pair of my 750W Dells load-balanced should run an S7 quite nicely. A single 1300W server supply should also do pretty well. You're right; a lot of supply kits are gonna get sold in the next month.
A pair of my 750W Dells load-balanced should run an S7 quite nicely. A single 1300W server supply should also do pretty well. You're right; a lot of supply kits are gonna get sold in the next month.
I wonder if they'd complain if he used a splitter from one of his nice sturdy 16AWG cables to a pair of jacks. It'd be pretty much just as safe.
Good question I would get a official anwser on it. I'm not sure they were very very vague on what improper powering could be. It for sure is using only 2 from their eyes. They emailed me a paper and sent one with S5+ to make sure I did not even think about 2 only.
But not sure if you have them on a proper splitter as they don't say you cannot do it.... so more possible on that way for sure.
two out of six evga 1300 cables are already split. i see no difference in splitting the other four as long as a single red cable can handle 266w (it will be 133w per connector, though). i don't have 240w in my house (apart from dryer and stove), so ordering their PSU is out of the question.
Depending on your options I would look into 240. It really is nice to have using a PDU and being able to get a lot of juice is very nice. I do see that it's not the option for everyone.
What I think is one of the server kit people are going to have a higher then normal sales rate with S7 release. I see them putting out a kit with enough PCIe cables on it. They have a few weeks from release date of S7 to get these kits in stock and sell them. And I predict they will do just that.
As long as you have two entire cables per board - one split, one unsplit - should be fine. It's up to Bitmain whether that's "fine" by their standards. Running 3 cables would be better, and with as many idiots as there are in the world thinking their junker 20AWG Wal-mart supplies can do anything right, I can understand why they'd insist on three cables.
The cables you have will do the job safely, even with a splitter on one cable per board.
The cables you have will do the job safely, even with a splitter on one cable per board.
Great, I also found out on the internet that a a 16AWG cable can handle up to 3.7 Amps
Source: http://www.answers.com/Q/How_much_current_can_a_16_gauge_wire_handle
As long as you have two entire cables per board - one split, one unsplit - should be fine. It's up to Bitmain whether that's "fine" by their standards. Running 3 cables would be better, and with as many idiots as there are in the world thinking their junker 20AWG Wal-mart supplies can do anything right, I can understand why they'd insist on three cables.
The cables you have will do the job safely, even with a splitter on one cable per board.
The cables you have will do the job safely, even with a splitter on one cable per board.
So, can a single 16AWG cable handle 2 connectors safely? (Assuming I splitted the PCI cable)
I wonder if they'd complain if he used a splitter from one of his nice sturdy 16AWG cables to a pair of jacks. It'd be pretty much just as safe.
Good question I would get a official anwser on it. I'm not sure they were very very vague on what improper powering could be. It for sure is using only 2 from their eyes. They emailed me a paper and sent one with S5+ to make sure I did not even think about 2 only.
But not sure if you have them on a proper splitter as they don't say you cannot do it.... so more possible on that way for sure.
two out of six evga 1300 cables are already split. i see no difference in splitting the other four as long as a single red cable can handle 266w (it will be 133w per connector, though). I don't have 220/240V in my house (apart from the dryer and stove), so ordering their PSU is out of the question.
I wonder if they'd complain if he used a splitter from one of his nice sturdy 16AWG cables to a pair of jacks. It'd be pretty much just as safe.
Good question I would get a official anwser on it. I'm not sure they were very very vague on what improper powering could be. It for sure is using only 2 from their eyes. They emailed me a paper and sent one with S5+ to make sure I did not even think about 2 only.
But not sure if you have them on a proper splitter as they don't say you cannot do it.... so more possible on that way for sure.
I wonder if they'd complain if he used a splitter from one of his nice sturdy 16AWG cables to a pair of jacks. It'd be pretty much just as safe.
The question is about your PSU cables. The answer, then, is also about your PSU cables. If your PSU has PCIe cables made from 16AWG wire, it should be okay. If your PSU has PCIe cables made from 18AWG wire, I'd say it's a poorly-thought-out design.
I am pretty certain they are going to send same kinda paperwork S5+ came with. Even if 2 would do it if they catch you doing it voids warranty.
So if they catch someone using 2 and in warranty I think they will void it from their paper at least if they keep it same as S5+. They considered it something thing like improper powering or something like that.
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Also Includes 4x Custom Black / White Heavy Duty 16 Gage 24″ Double Ended PCI-E Cables Made in the USA!
My bad! So 7 cables should do the trick! Thats awesome
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Also Includes 4x Custom Black / White Heavy Duty 16 Gage 24″ Double Ended PCI-E Cables Made in the USA!
The question is about your PSU cables. The answer, then, is also about your PSU cables. If your PSU has PCIe cables made from 16AWG wire, it should be okay. If your PSU has PCIe cables made from 18AWG wire, I'd say it's a poorly-thought-out design.
How can I know the quality of the cables? This is the product http://holybitcoin.com/product/holy-bundle/
Thanks for your time, Its getting clearer to me
The question is about your PSU cables. The answer, then, is also about your PSU cables. If your PSU has PCIe cables made from 16AWG wire, it should be okay. If your PSU has PCIe cables made from 18AWG wire, I'd say it's a poorly-thought-out design.
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