2 PSU's How to connect? | Bitcointalksearch.org

abracadabra

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Quote from: monstrs on November 26, 2012, 01:17:36 AM

Quote from: beekeeper on November 24, 2012, 06:01:12 PM

Usually switching power supplies don't work or work very bad if you connect their + pin(s) together (if they work, one will win the war, unless you connect their bypass/whatever feedback pins together). You should have only ground (black wires) connected, anything yellow/red/orange should never meet in same board ( you said partly ).

Yes, from the beggining both psu's was connected with + , now when the minuses is connected, everything works fine.

This would have extremely helpful to have known earlier.

Quote from: abracadabra

I'm pretty sure you have connected something incorrectly.

A picture would be worth 10000000000 words.

monstrs

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Quote from: beekeeper on November 24, 2012, 06:01:12 PM

Usually switching power supplies don't work or work very bad if you connect their + pin(s) together (if they work, one will win the war, unless you connect their bypass/whatever feedback pins together). You should have only ground (black wires) connected, anything yellow/red/orange should never meet in same board ( you said partly ).

Yes, from the beggining both psu's was connected with + , now when the minuses is connected, everything works fine.

beekeeper

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LTC

Usually switching power supplies don't work or work very bad if you connect their + pin(s) together (if they work, one will win the war, unless you connect their bypass/whatever feedback pins together). You should have only ground (black wires) connected, anything yellow/red/orange should never meet in same board ( you said partly ).

crazyates

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Quote from: monstrs on November 24, 2012, 05:18:34 AM

If any interested.
VRM's was hot like hell on that HD 5870 gigabyte SOC edition. Dont know, what ccousd this. I just putted accelero xtreme cooler on it and on vrms heatsinks from accelero cooler. Now the temps is very good.

I dare you to put this bad boy on along with your accelero: http://www.ebay.com/itm/Thermalright-VRM-R3-VGA-Heatpipe-Heatsink-ATI-5870-5850-/180525774685

monstrs

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If any interested.
VRM's was hot like hell on that HD 5870 gigabyte SOC edition. Dont know, what ccousd this. I just putted accelero xtreme cooler on it and on vrms heatsinks from accelero cooler. Now the temps is very good.

monstrs

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Had to lower clock speed to 300 nd memory to 150 to that hot card and still sits at 63 degrees. Its like no heatsink would be applied Sad

Too bad i will be abl to get my hands on it only after 4 days.

monstrs

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Just an update.

Today connected the rig to free eletricity facility.
Problem was on the 3rd card, which hanged computer, when started mining. Interesting, than after a wile it restarts whole rig. Probably something went wrong with cooling on that 3rd card, because now without any load on it, it reaches 79 degres, any more ideas, what went wrong? Yesterday all was fine. Thanks.

monstrs

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Thanks to all, i got it working. 2nd psu is now connected to primary psu's - and are now feeding one card compleately. Strange thing thoe: it works only on rear card that is connected to pci-x1. Anyways, it works fine, with 1 card connected and a couple of vents on it it consumes totaly ~220W.

panda1

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Yeah, sounds like 2nd PSU is not turned on to supply power.

bcpokey

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Quote from: monstrs on November 15, 2012, 08:31:48 AM

When i connect 1 card compleatly to 2nd psu, windows cant see it. When i connect 2 cards partly to one and another psus, it is working, vents are spinning, but no power from second PSU is taken. Do i need to connect both PSUs 24 pin motherboard 2 wires to get it worked?

Well I don't think you read my last post but I will try to help again anyway. It sounds like your 2nd PSU is not connected at all, that is why the GPU does not show up in windows when it is connected (it is not being powered). You have not really provided any description your setup, nor pictures, leaving people in the dark so I will assume that it is simply configured wrong.

I would
A) Not suggest you run this setup
B) If you really want to, try something like this: http://www.frozencpu.com/products/5637/cpa-167/Lian_Li_Dual_Power_Supply_Adapter_Cable.html

It will "bridge" the PSUs to the MB. They will both receive the "On" signal when you power up, and I believe some of the 3.3V will be shared (not 100% on that). At this point, hooking up GPUs should work. The reason I said A is that the PSU not connected to all the bells and whistles of the MB/HDs/Fans/etc. is likely to go out of ATX spec when a heavy (dual GPU?) 12V load is applied to it (such as running a mining card) with little to no 3.3/5V load on it (the cheaper the PSU the more likely this is to happen). This means that it will supply power in a way that is not recommended, and potentially damaging. But that's your call.

Hope this has helped.

Cablez

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I owe my soul to the Bitcoin code...

Quote from: monstrs on November 15, 2012, 08:31:48 AM

When i connect 1 card compleatly to 2nd psu, windows cant see it. When i connect 2 cards partly to one and another psus, it is working, vents are spinning, but no power from second PSU is taken. Do i need to connect both PSUs 24 pin motherboard 2 wires to get it worked?

You have to make sure that the PSU that is not connected to the motherboard has its green wire jumpered to ground and is turned on by the switch on its rear.

abracadabra

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Quote from: monstrs on November 15, 2012, 08:31:48 AM

When i connect 1 card compleatly to 2nd psu, windows cant see it. When i connect 2 cards partly to one and another psus, it is working, vents are spinning, but no power from second PSU is taken. Do i need to connect both PSUs 24 pin motherboard 2 wires to get it worked?

I'm pretty sure you have connected something incorrectly.

A picture would be worth 10000000000 words.

monstrs

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When i connect 1 card compleatly to 2nd psu, windows cant see it. When i connect 2 cards partly to one and another psus, it is working, vents are spinning, but no power from second PSU is taken. Do i need to connect both PSUs 24 pin motherboard 2 wires to get it worked?

bcpokey

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Define "connected"

Most modern day GPUs require PCI-E power connectors, if those are coming from the 2nd PSU, then it will draw from that PSU, if not, it won't. Not rocket science.

If you're trying to jury rig some crazy contraption of daisy-chained molex converters between both PSUs, that's not gonna cut it. The only cross connection you really want is the on/off jumper. Otherwise just plug things in directly and you're fine. I do not recommend mixing connectors between the two PSUs, though it's not necessarily a hard and fast rule that I know of.

MrTeal

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Quote from: monstrs on November 14, 2012, 09:23:40 AM

Cant make a picture now.

Any example, how it should work?

I don't suppose you own a multimeter, do you?

Also, I don't think you answered Cablez's question. Why you turn on the system, do the fans on both PSUs spin up?

monstrs

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Cant make a picture now.

Any example, how it should work?

abracadabra

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Quote from: monstrs on November 14, 2012, 12:37:05 AM

The second PSU is connected like this : http://www.youtube.com/watch?v=u0OKmIuNtmI

But PC is not using second psu at all, no matter how many cards is connected. If i am using only noname 550W psu, i can run 2 cards on it, no problem, but when connected like second psu, it takes 5W from the wall. The corsair PSU is taking all the load and is hot like hell, but doing the job.

picture of rig wth closeup of psu connections please.
sounds like your 2nd psu isn't conencted to anything.

monstrs

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The second PSU is connected like this : http://www.youtube.com/watch?v=u0OKmIuNtmI

But PC is not using second psu at all, no matter how many cards is connected. If i am using only noname 550W psu, i can run 2 cards on it, no problem, but when connected like second psu, it takes 5W from the wall. The corsair PSU is taking all the load and is hot like hell, but doing the job.

Cablez

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Does the fan in each PSU spin up? You may want one of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16812201037

monstrs

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To noname PSU is connected 1 card compleatly, and 1 card partly.
Each PSU has his own power cord. About how the atx cord is shortened, will post later.

Topic: 2 PSU's How to connect? (Read 11061 times)