Parallel Miner 2400w PSU - questions / input requested - page 2.

SCSI2

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Quote from: crazydane on September 14, 2017, 10:53:28 PM

[...]
Won't be long before I'll max out that 125A sub-panel, lol.

You may want to try and add a 2nd Delta PSU for 8x 1080ti's. More efficient that way as the fans won't spin at full thrust. I think each can eat up to 10W and with six of them going you will be looking at extra 40-50W in waste.

Also, PSU's maximum efficiency is usually acheived at around 50-60% of total capacity. I don't have the numbers for this particular Delta model to back it up, but most others I've seen suggest that you may save around 2-3% by running them at 50% power cap. Extra PSU is only $79 if I recall correctly.

I think I posted this already, but anyways...

When you max out your sub-panel, you can finally whack those storage arrays and ADCOM's (don't see them from this angle). They don't help with mining profitability. Onkyo can stay. I like Onkyo lol.

SCSI2

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Quote from: crazydane on September 14, 2017, 06:00:59 PM

[...] I was looking at this 8-pin PCIe extender cable I had and concluded that the connectors on the GPU side were 4x 12V and 4x GND.

[...]

This particular 8-pin PCIe power cable is plain wrong because it's made backwards! Those four yellow wires are supposed to carry GROUND at the 8-pin connector end. The proper cable has black (GND) wires entering connector on the side with the latch. This one has it the opposite way. Be careful with them. Most likely they are mislabeled as PCIe cables but in fact are CPU 12V power cables, which have such (opposite) polarity.

I got a few of those from amazon and they are pure garbage.

philipma1957

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Quote from: yobigd20 on September 06, 2017, 08:39:32 AM

The MAX input on these according to the labels are 240V at 13.6 amp. What kind of breaker/outlet/wire gauge are you using for these in the US?

30 amp pdu works for 2 this is 240 volt pdu.

power cords to the psu are 6 feet 14 gauge

and a pair of size 12 feet

crazydane

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Thanks. Yep, worked like a charm, as did the pico.

Once I get the last 2 1080Ti's added, I'll make it all look purdy.

Won't be long before I'll max out that 125A sub-panel, lol.

SCSI2

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Don't panic. Those extra 2 pins are not supposed to carry any current. They're there for sensing and conformance to certain standards. Some wacky GPUs don't test for those pins but most proper ones do. If they are not present, the GPU will think you may not have a good enough PSU and won't start at full power or won't start at all.

So, to simplify things, we can say that those two extra pins are there just to tell the GPU that your PSU is beefy enough.

Those AWG16 cables you got from Parallel are beefy enough for a welder. I did cut one open just to see and it had plenty of copper to be called an AWG16.

crazydane

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Ok, my bad. I was looking at this 8-pin PCIe extender cable I had and concluded that the connectors on the GPU side were 4x 12V and 4x GND.

So both a 6 pin and 8 pin PCIe cable has 3 current carrying wires in each direction. I suppose the 8 pin connector has 5 in one direction, but only 3 in the other, so is seems to me the current capacity is limited to what 3 wires can carry. I guess typically the gauge must be larger on 8 pin cables? Just seems odd to me why they did it that way.

chtat12

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I'm not sure if I got your comments right.

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8

8 PCIE is supposed to have 3 of 12V pins and 5 of ground pins. Some fancy PSU will have a few ground pins replaced with sense pins to check the voltage drop at high load.

So the cables you got are supposed to be like that.

crazydane

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Right, so definitely don't plug them in on the GPU side, right?

What I don't understand is why would parallel miner ship GPU cables that are going to fry your GPUs and/or cables and PSUs if you plug in the +2 connector?

From the top image in your pic, it is pretty clear that pins 5-8 are all 12V and it is obvious from looking at the cables that parallel miner ships, that pins 4 and 5 are both GND.

I mean, what devices out there have pins 1-5 as GND and pins 6-8 as 12V?

chtat12

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Quote from: crazydane on September 14, 2017, 04:46:55 PM

I got my Delta 2400W PSU today along with the 32 PCIe 6 pin to 6+2 pin cables. Since the +2 pins are both ground, it seems to me that it would short out my 1080Ti cards if I plug in the +2 connector to the GPU 8 pin connectors, no? Aren't the 8 pin PCIe connectors on the graphics cards 2 rows of 4 pins, one row being all GND and the other row being all +12V?

No. The extra 2 pins on the 8-pin PCIE are ground.

https://i.stack.imgur.com/M3aeL.png

I'm not sure why either.

crazydane

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I got my Delta 2400W PSU today along with the 32 PCIe 6 pin to 6+2 pin cables. Since the +2 pins are both ground, it seems to me that it would short out my 1080Ti cards if I plug in the +2 connector to the GPU 8 pin connectors, no? Aren't the 8 pin PCIe connectors on the graphics cards 2 rows of 4 pins, one row being all GND and the other row being all +12V?

SCSI2

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Quote from: jstefanop on September 06, 2017, 10:46:19 AM

Quote from: yobigd20 on September 06, 2017, 08:39:32 AM

The MAX input on these according to the labels are 240V at 13.6 amp. What kind of breaker/outlet/wire gauge are you using for these in the US?

At full load these are going to pull 10-12A, but remember this is 240v so thats 5-6A on each hot leg. I have 4 of these (they are not running 100%) on a double 30A breaker using 10G wire. Breaker is fine (since max load is 24A), and 10G is rated for 30A as well (just make sure you get the single copper core type).

If some device is pulling 10A from a power source, it will have 10A running through each of two legs. Does not matter if it's 12V 120V or 240V, both wires need to be rated for full current.

The confusion probably comes from the fact that at twice the voltage (240V vs 120V) you need only half the current. But still, if the device is going to pull 10A, it will do it on both legs. No question about it.

Now, to answer the original question. Since this PSU (2400W Delta) is rated at 13.6A max, it needs an AWG14 power cord to run safely at full load. Pretty much any cord with a C19 connector you can find will be at least AWG14.

Note that even if a single AWG16 wire will be fine carrying up to 15A, you need to pick AWG14 if you bundle three of them closely together in a single power cord since they won't be able to dissipate heat as well as a single conductor.

Here's a good info on the current ratings for copper wires: http://www.engineeringtoolbox.com/wire-gauges-d_419.html

I personally run these PSU's at half the load to keep then nice and quiet.

-scsi

jstefanop

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Quote from: yobigd20 on September 06, 2017, 08:39:32 AM

The MAX input on these according to the labels are 240V at 13.6 amp. What kind of breaker/outlet/wire gauge are you using for these in the US?

At full load these are going to pull 10-12A, but remember this is 240v so thats 5-6A on each hot leg. I have 4 of these (they are not running 100%) on a double 30A breaker using 10G wire. Breaker is fine (since max load is 24A), and 10G is rated for 30A as well (just make sure you get the single copper core type).

yobigd20

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The MAX input on these according to the labels are 240V at 13.6 amp. What kind of breaker/outlet/wire gauge are you using for these in the US?

TeamGreen

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I just started using these on the warehouse rigs and can report back that they are working just fine. Finally got everything setup correctly to run the entire rig off the one 2400w PSU with the ATX adapter. This greatly reduces cost for the mining rigs as previously I was using a 1600 G2 and a 1000 G3 for each rig.

https://i.imgur.com/9SQ57nv.jpg

Here's a short video showing the PSU in action.

https://www.youtube.com/watch?v=Dq0CyIQWDrk

Here is a link if you want to order one -

http://www.parallelminer.com/?wpam_id=1

kjs

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Quote from: zer0k on August 24, 2017, 03:58:46 PM

Quote from: HagssFIN on August 24, 2017, 03:52:55 PM

Yeah, I would say that amount of power capacity is a little overkill. Cheesy

Well...you can technically fit 10 x 1080 ti Founder Edition cards in a rack mount case, and they have been show to pull sustained power consumption in the 3.0-3.2kW range at 100% PL, and even peak to nearly 5.3kw
Patrick over at STH has been playing around with some ridiculously cool Supermicro GPU servers

https://www.servethehome.com/category/server-parts/server-systems/

I have one of those, good machines.

SCSI2

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I just think those FE's going to choke sitting so close to each other.

HagssFIN

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Electrical engineer. Mining since 2014.

Quote from: zer0k on August 24, 2017, 03:58:46 PM

Quote from: HagssFIN on August 24, 2017, 03:52:55 PM

Yeah, I would say that amount of power capacity is a little overkill. Cheesy

Well...you can technically fit 10 x 1080 ti Founder Edition cards in a rack mount case, and they have been show to pull sustained power consumption in the 3.0-3.2kW range at 100% PL, and even peak to nearly 5.3kw
Patrick over at STH has been playing around with some ridiculously cool Supermicro GPU servers

https://www.servethehome.com/category/server-parts/server-systems/

Yeah, but he plans doing from 6 to 8 1080 ti's, so 2400W PSU and Pico PSU for ATX plus rest of things is sufficient.

zer0k

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Quote from: HagssFIN on August 24, 2017, 03:52:55 PM

Yeah, I would say that amount of power capacity is a little overkill. Cheesy

Well...you can technically fit 10 x 1080 ti Founder Edition cards in a rack mount case, and they have been show to pull sustained power consumption in the 3.0-3.2kW range at 100% PL, and even peak to nearly 5.3kw
Patrick over at STH has been playing around with some ridiculously cool Supermicro GPU servers

https://www.servethehome.com/category/server-parts/server-systems/

SCSI2

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Quote from: zer0k on August 24, 2017, 03:49:23 PM

Haha...I'm in the same boat and need to offload my Rosewill 1500/1600W PSU's

Why are you still going to run the ATX PSU though?
I'm planning on powering the motherboard from the 2400W with their atx-power-module

I just had a pile of PSUs within arms reach so I just rammed one in there to see if it fits. It did

I will do 6x 1080ti and at 1,500W the Delta PSU should do just fine and be quiet. Will use Pico PSU for the motherboard and (20+) Corsairs etc. will go to the "for sale" section of the forum over the weekend.

HagssFIN

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Yeah, I would say that amount of power capacity is a little overkill. Cheesy

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