Problems with mining rig

[Eronimo]

Hi guys,

I’m trying to build a rig and I’m on a point where i am very confused.

This is the setup for my rig:

https://imgur.com/a/i8cwA

The PSU´s on the pic from left to right: 1-3


My setup:

3x 750w PSU

6x AMD R9 290

1x Mainboard: HM 76-65 BTCcombo

6x Riser (6 Pin to SATA)



CASE 1: CHECK

When i start my rig with only 1 psu (psu 1) everything works fine.

The psu consumes 600 W and powers the mobo + 2 cards + and 2 riser.

I can mine with this setup so everything so good so far.


CASE 2: CHECK

Now if i connect the other two PSU`S (psu 2 and psu 3) with ONLY ONE CARD,

So that totally 4 cards are connected and running:

PSU 1: 2 cards + mobo + 2 risers

PSU 2: 1 card + 1 riser

PSU 3: 1 card + 1 riser

This Setup although works fine and i have no problem with the rig.

The troubles come up with card no. 5 and 6.


CASE 3: Problematically

PSU 1: 2 cards + mobo + 2 risers

PSU 2: 2 cards + 2 risers

PSU 3: 1 card + 1 riser

If i connect now another card to psu 2 or 3 and start mining, psu (2 or 3) gets under load

and i can see how a random gpu fan stopps working, a few secons after that the PSU shut completly down.

Sometime before i started testing it again i saw the GPU Fans of one of them was still spinning even when the PSU was

already power off.

I thought the issue would be of some power consumption. So i started testing it with a power consumption meter:

GPU: 250w

Riser: 50w

Combined: stable 300w

Combined: 2 GPU 2 Riser = 600w

Realy strange is when i put the mobo on this psu the power consumption is still 600w .

So i start testing the PSU who is running without the mainboard and shut downs on mining.

The PSU reaching exact 600w before they shut down.


CASE 4: Same as 3

PSU 1: 2 cards + mobo + 4 risers

PSU 2: 2 cards

Nothing changed same result like case 3.

To combine all 3 PSUs iam using:

https://i.ebayimg.com/images/g/0X0AAOSwQwZags8j/s-l300.jpg


Has anyone an idea what i am doing wrong?
################################
UPDATE: I started a view new tests.

Pluging all psus on wall outlet = nothing changed
Tryed some bios changes especially (gain1,gain2) = nothing changed
Connecting 1 psu with 2 gpus + 2 risers and started setting power limit on -10 -20 and so on
I`ve got power consumption: 500w it shuts down after view minutes of mining , then 440w it shuts down again!

The only conclusion that i can draw from the result is that: my 750w power supply is not able to run more than one graphics card at the same time if it is not connected to the mainboard, everything else is going well

And yes i am using extra splitter.

[Agozyen]

You've done a fair bit of testing already.  If you can lower the power consumption on the cards to something a lot lower.  I know Nvidia cards can be tweaked, I assume Radeons can as well.  If everything runs on the lower setting then you need higher capacity power supplies.

[yrk1957]

You've done a fair bit of testing already.  If you can lower the power consumption on the cards to something a lot lower.  I know Nvidia cards can be tweaked, I assume Radeons can as well.  If everything runs on the lower setting then you need higher capacity power supplies.

Yes, that's the first to check - lower power consumption. R9 290 seems quite power hungry (~300W!!).

Second, about those 8pin-y-cables. Did they come with the PSU or are you using a extra splitter as in your picture? You  should not be using the extra splitter.

[Eronimo]

You've done a fair bit of testing already.  If you can lower the power consumption on the cards to something a lot lower.  I know Nvidia cards can be tweaked, I assume Radeons can as well.  If everything runs on the lower setting then you need higher capacity power supplies.

Yes, that's the first to check - lower power consumption. R9 290 seems quite power hungry (~300W!!).

Second, about those 8pin-y-cables. Did they come with the PSU or are you using a extra splitter as in your picture? You  should not be using the extra splitter.

UPDATE: I started a view new tests.

Pluging all psus on wall outlet = nothing changed
Tryed some bios changes especially (gain1,gain2) = nothing changed
Connecting 1 psu with 2 gpus + 2 risers and started setting power limit on -10 -20 and so on
I`ve got power consumption: 500w it shuts down after view minutes of mining , then 440w it shuts down again!

The only conclusion that i can draw from the result is that: my 750w power supply is not able to run more than one graphics card at the same time if it is not connected to the mainboard, everything else is going well

And yes i am using extra splitter.

[nathan_tek]

Hi guys,

I’m trying to build a rig and I’m on a point where i am very confused.

This is the setup for my rig:

https://imgur.com/a/i8cwA

The PSU´s on the pic from left to right: 1-3


My setup:

3x 750w PSU

6x AMD R9 290

1x Mainboard: HM 76-65 BTCcombo

6x Riser (6 Pin to SATA)



CASE 1: CHECK

When i start my rig with only 1 psu (psu 1) everything works fine.

The psu consumes 600 W and powers the mobo + 2 cards + and 2 riser.

I can mine with this setup so everything so good so far.


CASE 2: CHECK

Now if i connect the other two PSU`S (psu 2 and psu 3) with ONLY ONE CARD,

So that totally 4 cards are connected and running:

PSU 1: 2 cards + mobo + 2 risers

PSU 2: 1 card + 1 riser

PSU 3: 1 card + 1 riser

This Setup although works fine and i have no problem with the rig.

The troubles come up with card no. 5 and 6.


CASE 3: Problematically

PSU 1: 2 cards + mobo + 2 risers

PSU 2: 2 cards + 2 risers

PSU 3: 1 card + 1 riser

If i connect now another card to psu 2 or 3 and start mining, psu (2 or 3) gets under load

and i can see how a random gpu fan stopps working, a few secons after that the PSU shut completly down.

Sometime before i started testing it again i saw the GPU Fans of one of them was still spinning even when the PSU was

already power off.

I thought the issue would be of some power consumption. So i started testing it with a power consumption meter:

GPU: 250w

Riser: 50w

Combined: stable 300w

Combined: 2 GPU 2 Riser = 600w

Realy strange is when i put the mobo on this psu the power consumption is still 600w .

So i start testing the PSU who is running without the mainboard and shut downs on mining.

The PSU reaching exact 600w before they shut down.


CASE 4: Same as 3

PSU 1: 2 cards + mobo + 4 risers

PSU 2: 2 cards

Nothing changed same result like case 3.

To combine all 3 PSUs iam using:

https://i.ebayimg.com/images/g/0X0AAOSwQwZags8j/s-l300.jpg


Has anyone an idea what i am doing wrong?

If you have connected all as in the picture you have posted:
-Power only 1 gpu with 1 pcie cable from the psu
-Try to use only 1 sata cable for 1 riser or if you have enough free pcie cables, connect the riser without the 6pin to sata adapter

[nc50lc]

If you have connected all as in the picture you have posted:
-Power only 1 gpu with 1 pcie cable from the psu
-Try to use only 1 sata cable for 1 riser or if you have enough free pcie cables, connect the riser without the 6pin to sata adapter

The first statement wont help him.

• Read his setup: CASE 2, he already tried all the three PSUs with one card and it's working.

@Eronimo You might want to tell us the PSU's brand and model.

[nathan_tek]

If you have connected all as in the picture you have posted:
-Power only 1 gpu with 1 pcie cable from the psu
-Try to use only 1 sata cable for 1 riser or if you have enough free pcie cables, connect the riser without the 6pin to sata adapter

The first statement wont help him.

• Read his setup: CASE 2, he already tried all the three PSUs with one card and it's working.

@Eronimo You might want to tell us the PSU's brand and model.

I wanted to say, he should not power 2 gpu's with only 1 pcie cable coming from the psu, look his cable managment in the picture he uploaded ;-)

[Dannyh2]

If you have connected all as in the picture you have posted:
-Power only 1 gpu with 1 pcie cable from the psu
-Try to use only 1 sata cable for 1 riser or if you have enough free pcie cables, connect the riser without the 6pin to sata adapter

The first statement wont help him.

• Read his setup: CASE 2, he already tried all the three PSUs with one card and it's working.

@Eronimo You might want to tell us the PSU's brand and model.

I wanted to say, he should not power 2 gpu's with only 1 pcie cable coming from the psu, look his cable managment in the picture he uploaded ;-)

Yeah you are right, but it should work untill the connectors on the psu is melded. (not that you want this lol)
Seems like he is drawing to much power for the psu's to handle. A psu with 750W does not mean it can give 750W on the 12V rail.
I would try this: set your gpu cores to 900Mhz each. So it will draw 40/50W less on each GPU. That will probably work. And it will still give like 24/26mh for each gpu

[Eronimo]

If you have connected all as in the picture you have posted:
-Power only 1 gpu with 1 pcie cable from the psu
-Try to use only 1 sata cable for 1 riser or if you have enough free pcie cables, connect the riser without the 6pin to sata adapter

The first statement wont help him.

• Read his setup: CASE 2, he already tried all the three PSUs with one card and it's working.

@Eronimo You might want to tell us the PSU's brand and model.

I wanted to say, he should not power 2 gpu's with only 1 pcie cable coming from the psu, look his cable managment in the picture he uploaded ;-)

Yeah you are right, but it should work untill the connectors on the psu is melded. (not that you want this lol)
Seems like he is drawing to much power for the psu's to handle. A psu with 750W does not mean it can give 750W on the 12V rail.
I would try this: set your gpu cores to 900Mhz each. So it will draw 40/50W less on each GPU. That will probably work. And it will still give like 24/26mh for each gpu

@nc50lc: these are my PSU´s: http://s020.radikal.ru/i702/1504/05/ae3c057f7662.jpg

@Dannyh2: check my question i´v edited it with the update so far

[gsanjin]

It could be that this PSU needs some +5v load to operate properly.

[Eronimo]

It could be that this PSU needs some +5v load to operate properly.

I dont get it, what du you mean with that?

[nc50lc]

Chrome displays a warning to your link so I archived it for everyone to view: https://archive.is/zHbok
So this is your PSU: https://www.aerocool.com.tw/en/psu/kcas/kcas-750m

Sure it can deliver enough power to each of the 2 GPU.
There must be something wrong with the connections.

It could be that this PSU needs some +5v load to operate properly.

This doesn't makes sense, a total of 100W from 5v is enough to power any high end rigs.

[Eronimo]

have someone a nother idea what it could be?

Im still trying to find solution

[bluecoinX]

I think you should buy a power source, at least 1500 watts. This is very important. Try it.

[Eronimo]

I think you should buy a power source, at least 1500 watts. This is very important. Try it.

So if someone is interested. I have bought new PSU´s from Corsair, also 750 W, and the rig is working fine now. Thx allot for your help guys!