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Author Topic: Server Power Supply Interface Board - for standalone miners and GPU rigs  (Read 120053 times)
showtimex
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January 09, 2014, 07:30:51 PM
 #101

I'd be fine with 16AWG; all my stuff is currently running on 12 inches 18AWG which is too dern small but it's what I had. 14AWG was requested, so that's what I'll deliver to the requestor. He's been smoking 18AWG wires.

I understand, and I've had problems with burnt 18AWG connectors myself, usually only a problem with those PCIe splitter connectors 1 in 2 out though.

My point about the 14AWG though was it is likely physically impossible to use 14AWG directly from the power supply to the PCIe connector itself, as the individual pins will have a lot of trouble accepting that size AWG. *edit OK I've gone ahead and attempted to crimp a 14AWG wire, I had a lot of trouble and messing with it but did manage to crimp it, wasn't pretty and damaged part of the connector that holds the wire in place, so unless there is a source for some kind of special larger pin, I really think 16AWG is the practical limit, at least with the standard PCIe pin which I have here.


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January 09, 2014, 07:39:11 PM
 #102

I want to say I saw "special" crimp pins on digi that were purpose made for certain wire gauges. Maybe there are ATX crimp pins with longer wings for larger gauge wire?

I know the EVGA 1.5k supernova I have uses special crimp pins, they have a super wide flange that crimps down onto the individual wire sleeving so they don't have to use heatshrink. I've also often wondered how the double stacked wires on a single pin work, from the few I've looked at it seems they are just much better at cramming two wires, holding the pin, and crimping it all clean than I am, because the pins look the same...


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January 09, 2014, 07:41:54 PM
 #103

Each of the PCI-e wires doesn't need to be 14, that's crazy. I'm running 12awg from the power supply to 8" from the cards, where they split off into 4 pci-e connectors with standard 18awg wire. 18awg can handle a lot of power in short length.
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January 09, 2014, 07:45:02 PM
 #104

I've requested quotes for 16AWG custom cables, and 14AWG if they think they can reliably manufacture them.  May have those quotes by Friday or Monday, depending.

Still in dialogues with FCI, Arrow, and Avnet about how to proceed on the 51915 equivalent connector, although things are looking a bit rough in terms of samples.  We may have to foot the bill for a manufacturing run if we want to see those connectors again any time soon.
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January 09, 2014, 07:51:25 PM
 #105

That's what I'm figuring on doing. It'll take a goodly while to get them from the factory, but probably worth it as long as FCI product engineers didn't tell me wrong about proper mating connectors, and the mechanical diagram data isn't wrong. What I don't get is this is apparently the only power supply with that pinout type, that uses 0.2" spacing instead of 0.25" but why are there so many of them running around?

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January 09, 2014, 07:59:16 PM
 #106

I want to say I saw "special" crimp pins on digi that were purpose made for certain wire gauges. Maybe there are ATX crimp pins with longer wings for larger gauge wire?

I know the EVGA 1.5k supernova I have uses special crimp pins, they have a super wide flange that crimps down onto the individual wire sleeving so they don't have to use heatshrink. I've also often wondered how the double stacked wires on a single pin work, from the few I've looked at it seems they are just much better at cramming two wires, holding the pin, and crimping it all clean than I am, because the pins look the same...

It may be very possible, someone would have to source those larger pins if they do exist. If we can get manufactured 14AWG wires directly though that would likely be the most economical.

Each of the PCI-e wires doesn't need to be 14, that's crazy. I'm running 12awg from the power supply to 8" from the cards, where they split off into 4 pci-e connectors with standard 18awg wire. 18awg can handle a lot of power in short length.

Right, this is what I've done with my rigs, 10AWG from the power supply x 4 per polarity (yes its overkill, 2 or 3 would have been fine) from there to a distribution block, then 14AWG x 2 to an 8 port push connector (one for each polarity) for each graphics card, leaving the push connector to the card I use the 16AWG cables.
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January 09, 2014, 08:09:27 PM
 #107

The distro block is built into these boards. The simplest solution is to run a cable from there straight to the device; that saves connections and adapters and stuff. If you need to power a few hundred devices, wrangling exactly one wire per device is a whole lot easier and that's currently what we're looking at.

I'll probably focus on making 16AWG available alongside the boards once everything's ironed out.

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January 09, 2014, 08:23:10 PM
Last edit: January 10, 2014, 12:57:28 AM by showtimex
 #108

The distro block is built into these boards. The simplest solution is to run a cable from there straight to the device; that saves connections and adapters and stuff. If you need to power a few hundred devices, wrangling exactly one wire per device is a whole lot easier and that's currently what we're looking at.

I'll probably focus on making 16AWG available alongside the boards once everything's ironed out.

Exactly right, simplest and best is to go direct from your distro boards directly to the GPUs, but you will be limited to maybe 3 or so feet until voltage levels start to drop off to unacceptable levels, even with 16AWG wiring.

The only way to solve longer runs is by using heavier AWG from the distro board to an intermediate block or connector and from there out to the card which of course adds cost and complexity. OR if a source can be found for a custom made 14AWG cable with PCIe pin for a direct run from distro block to GPU's.

*OOps I was forgetting the fact that there are 3 x 2 12V lines running to each GPU, so disregard my earlier comments, just go with 16AWG and be happy. Adding up the 6 12V lines that run to each GPU means the total diameter is about equal to running between a 0 and 1AWG cable to each card. So if you wanted you can run over 20' with very little drop in voltage.

Looking at the numbers again 18AWG (x6 per GPU) is equivalent to running between 2 and 3AWG cable so even it is more than sufficient for up to at least 10'
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January 09, 2014, 08:27:01 PM
 #109

Quote
OR if a source can be found for a custom made 14AWG cable with PCIe pin for a direct run from distro block to GPU's.

Which is what I currently have a bid for, and should have in-hand by the time boards are ready to ship if everything works out.

Also, since these are 750W supplies instead of 2000W supplies, running a whole lot of stuff off a single supply isn't really that much of an issue. Two AntMiner S1, two AM Cubes, two or three decent GPUs per supply. I've got a DPS800 to start prototyping for, and will look into those 2000W supplies as well, so it'll need to be a consideration in the future for sure.

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January 09, 2014, 08:34:33 PM
 #110

You can find all the info, pics and diagrams about the dps-2000bb in this thread http://www.rcgroups.com/forums/showthread.php?t=1005309&page=41
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January 10, 2014, 12:26:15 AM
 #111

I got a N750P-S0 PSU here, it is the same as Z750P ? , looks pretty much the same, pin wise, 750W, 62.4A on the 12V



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January 10, 2014, 12:36:11 AM
 #112

Pretty sure they're compatible, as far as I know the differences are internal.

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January 10, 2014, 01:32:49 AM
 #113

Yes, I am now Saturn is to use this power.https://ip.bitcointalk.org/?u=http%3A%2F%2Fstatic.rcgroups.net%2Fforums%2Fattachments%2F3%2F1%2F3%2F5%2F4%2F3%2Fa4992131-212-Delta%2520DPS-835AB%2520IBM%2520835w.jpg&t=536&c=9-Ki6gfBikXNYQ
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January 10, 2014, 01:41:35 AM
 #114

Insane $8 http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0&_nkw=IBM+39Y7355&_sacat=0&_from=R40

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January 10, 2014, 03:49:49 AM
 #115

whoa, shorted the pins on that dell psu, that thing sounds like a vacuum cleaner



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January 10, 2014, 03:51:02 AM
 #116

Which is why the board gives you fan speed control.

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January 10, 2014, 05:03:55 AM
 #117

whoa, shorted the pins on that dell psu, that thing sounds like a vacuum cleaner

I am starting the prototype for the Dell Z750.  Which pins do I need to short?  Do we have a pin diagram?

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January 10, 2014, 03:41:25 PM
 #118

How do you guys divide the rails?



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January 10, 2014, 11:31:57 PM
 #119

How do you guys divide the rails?

I hope it's only 1 rail.

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January 11, 2014, 01:57:27 AM
 #120

Where are you finding these PSU connectors? I have been looking for them for ages. Are these on digikey?

Tired of substandard power distribution in your ASIC setup???   Chris' Custom Cablez will get you sorted out right!  No job too hard so PM me for a quote
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