My first 8gpu rig 6 pci + 2 pci m.2 need recommendation on PSU - page 2.

Bare

member

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First thing I learned when I started mining is NEVER EVER cheap out on your psu!
Listen to these guys mewhoyou, psu is the heart of your rig, I even went as far as getting myself 1700w platimax,(which I know is an overkill for my rig with 4x390 but is capable powering 6x390, problem is you only get 5x 2x8pin pcie cables and you have to order 6th separately)
Sure as hell never had any power related problems with any of my rigs. you can get a good deal for enermax platimax 1700w if you're from EU, ~300€ compared to all other competitors which are usually priced around ~400€ Wink

xxcsu

hero member

Activity: 1498

Merit: 597

Quote from: mewhoyou on May 26, 2017, 11:17:03 AM

Houston we have LIFT Off!!!! aLL 8 CARDS have booted up.

Houston ! Houston ! What happened ? Engine failure ? Grin

Can we have a youtube link as you promised ? So we can see the miner program is running hours , days without any error with 8 cards stable , or at least some screenshot so all of us can see your op system recognized all 8 cards and hashing ? Wink

Your post From another topic looks like you have some power issue :

Quote from: mewhoyou on May 28, 2017, 07:31:02 PM

There is a slight problem currently facing which is the mobo has insufficient power ... i am setting up a 8 card and the board is givin in.

"the mobo has insufficient power" are you sure is not your PSU ? Wink

or maybe you celeron cpu (paired with 4gb of ram) can not handle all those pci-e lanes ? Wink

Za1n

legendary

Activity: 1078

Merit: 1011

Nice project! Good to hear you got all 8 cards working. I will definitely check out your YouTube channel as well when you post it.

May I ask if you are running a Skylake or Kabylake processor on the motherboard? Reason I ask is I heard that some boards have had issues running too many GPUs with Kabylake processors.

xxcsu

hero member

Activity: 1498

Merit: 597

Houston! U have a call ! if your system is up and running stable with 8 cards , im sure that youtube video you mentioned earlier is up ? Can we have a link ? Grin

so we can see the miner program is running hours , days without any error with 8 cards stable Wink

mewhoyou

sr. member

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Houston we have LIFT Off!!!! aLL 8 CARDS have booted up.

xxcsu

hero member

Activity: 1498

Merit: 597

you always need to know a real power draw for your system ... Gpuz measuring only the gpu power draw , not any another components on the vga cards !
Always check the power draw at the wall.
If you are using ur psu at max wattage , there is a chance your mining rig going to be very unstable . The optimal wattage is around 80% of the max rated wattage.
Yes you can way undervlot , underclock your 8 cards system for dual mining , but you are going to lose from max hashrate on both coins you are mining .
Yes you can run the 8 cards setup from 1300 watts psu , but then forget the max hashrate you can get out from your cards , in that case , better to build a 6-7 cards setup with proper bios mod , im talking about bios mod , not paste and copy mem straps !!!

Dont be cheap with the psu !!!

muratizm

member

Activity: 84

Merit: 10

Yesterday we've tested rx570.
it shows 120w usage on default (+ modded bios ram timings) without any voltage tweak.
msi armor 470 4gb shows 84w in full load in same system, but it draws more from wall.

rx570 says 120w, but it's more accurate (perhaps 132w from PSU, but more from wall due to power factor, mine is 80+ psu no bronze/gold/silver)

mewhoyou

sr. member

Activity: 353

Merit: 250

Quote from: Etherion on May 23, 2017, 12:54:15 PM

Maybe you are more lucky than me but I could not detect any gpu using an M.2 to pci-e adapter. Got refunded at least.

I do have a 8 (RX480 8Gb) GPU rig running from a z270 with 1x3 pci-e switch.

But I am using about 1500w of power. I am not undervoltage alot(-96mv) with memory timing shift and a little over clock on memory. But my aim is to get zero memory errors and have a stable system.

Keep us posted on your m. 2 test run. Hope it works for you

All my miners are running 6 x 470 with a 850 psu. This would be my first set where i will start to do dual mining. Try to remove the hassle of insufficient power when I push it further.

Etherion

sr. member

Activity: 512

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I am running an 1200w and 650w psu on that system. All modular and platinum. Not cheap but power is expensive where I am and loading is MB+5gpu and 3gpu. About just under 80%

Etherion

sr. member

Activity: 512

Merit: 260

Maybe you are more lucky than me but I could not detect any gpu using an M.2 to pci-e adapter. Got refunded at least.

I do have a 8 (RX480 8Gb) GPU rig running from a z270 with 1x3 pci-e switch.

But I am using about 1500w of power. I am not undervoltage alot(-96mv) with memory timing shift and a little over clock on memory. But my aim is to get zero memory errors and have a stable system.

Keep us posted on your m. 2 test run. Hope it works for you

muratizm

member

Activity: 84

Merit: 10

Although 570 uses a bit more power, with proper bios mod, they can run around 110-120w max each card.
8 x 120 = 960w
mobo ram ssd cpu is no more than 100w
1060w total.

why 1300w psu is not enough?
if it has enough vga (6 or 8 pin) cables and can provide enough AMPS for hungry graph cards, It probably can?
however, buying 2x 850w power is probably cheaper and provide better current to whole rig.

mewhoyou

sr. member

Activity: 353

Merit: 250

Quote from: xxcsu on May 22, 2017, 10:14:59 PM

can not wait to see your working , dual mining 8 gpu setup on youtube Grin

Just because you added 2 x m2 adapters , your system not going to be plug and play Wink

forget 2 psu setup ,forget 1300 watts psu !!! get a strong psu with at least 1600 watts , or you going to have a very unstable setup ...

thanks ... i have just finish the frame... got a factory to start laser cutting the frame... ops ...

about the PSU i am more keen on 2 850w than 1600w. Just that money spend seems more practical ... the more the better... its just 1600 with so much cable is not giving me the comfort.

xxcsu

hero member

Activity: 1498

Merit: 597

can not wait to see your working , dual mining 8 gpu setup on youtube Grin

Just because you added 2 x m2 adapters , your system not going to be plug and play Wink

forget 2 psu setup ,forget 1300 watts psu !!! get a strong psu with at least 1600 watts , or you going to have a very unstable setup ...

Spavvn

newbie

Activity: 37

Merit: 0

I am waiting for M.2 risers to arrive, will try similar project. Really interested in your results.

I'd try two identical 850W gold PSUs, they ain't that expensive either. My last build was 2x750W TT connected via copper wire and it is working fine. Just keep in mind to use same psu on GPUs and corresponding extenders. Power on AC setting on MBO also recommended.

mewhoyou

sr. member

Activity: 353

Merit: 250

Quote from: mcturkey on May 22, 2017, 07:16:39 PM

Quote from: mewhoyou on May 22, 2017, 05:51:17 PM

I am trying to build within a certain budget. I will be drawing power from 2 PSU. I am looking at 850w gold. 1 psu will power the system, 2 boards, and all risers where as the other unit will power the remaning 6 psu alone. I had an issue splitting riser to two PSU which gave a reverse current and blew one of them.

Either that or i get 1 PSU to power up the System and Risers and another PSU to power up the GPU. Rough calculations of 90watts per GPU alone would be sufficient. Ultimately this would be a better setup for me. But surely its going to be very messy....

You should not use a different PSU for the riser than you use for the GPU. The powered USB-cable risers should never have power beyond that necessary to carry the signal, and will not short something out (outside of a catastrophic failure). The GPU will draw some power from the riser, and some from the 6/8-pin on the card. These two sources should be the same.

Will construct the frame today and start piecing it together...

mcturkey

newbie

Activity: 22

Merit: 0

Quote from: mewhoyou on May 22, 2017, 05:51:17 PM

I am trying to build within a certain budget. I will be drawing power from 2 PSU. I am looking at 850w gold. 1 psu will power the system, 2 boards, and all risers where as the other unit will power the remaning 6 psu alone. I had an issue splitting riser to two PSU which gave a reverse current and blew one of them.

Either that or i get 1 PSU to power up the System and Risers and another PSU to power up the GPU. Rough calculations of 90watts per GPU alone would be sufficient. Ultimately this would be a better setup for me. But surely its going to be very messy....

You should not use a different PSU for the riser than you use for the GPU. The powered USB-cable risers should never have power beyond that necessary to carry the signal, and will not short something out (outside of a catastrophic failure). The GPU will draw some power from the riser, and some from the 6/8-pin on the card. These two sources should be the same.

mewhoyou

sr. member

Activity: 353

Merit: 250

Quote from: fanatic26 on May 22, 2017, 04:50:38 PM

Quote from: mewhoyou on May 22, 2017, 04:42:34 PM

Point taken but I will be using 1500 as I will push this with dual mining. Cards alone I expect 1200 watt and additional 300 for the system.

If you expect the system to draw 1500 watts a 1500w PSU is not nearly enough.....you will want at least 1800w. Pushing a PSU to its max rating will both lower the efficiency by a bunch, burn the PSU out more quickly, and most likely cause a bunch of crashes/hangs as the PSU will not be able to regulate its voltage properly at 100% usage. Thats on top of the instability you are building into the system by running too many cards on one board.

That looks like the Asus Prime H270 Plus...I see no supplementary power for all those PCI-E slots. Is that not a concern for your build running 8 cards?

I am trying to build within a certain budget. I will be drawing power from 2 PSU. I am looking at 850w gold. 1 psu will power the system, 2 boards, and all risers where as the other unit will power the remaning 6 psu alone. I had an issue splitting riser to two PSU which gave a reverse current and blew one of them.

Either that or i get 1 PSU to power up the System and Risers and another PSU to power up the GPU. Rough calculations of 90watts per GPU alone would be sufficient. Ultimately this would be a better setup for me. But surely its going to be very messy....

fanatic26

hero member

Activity: 756

Merit: 560

Quote from: mewhoyou on May 22, 2017, 04:42:34 PM

Point taken but I will be using 1500 as I will push this with dual mining. Cards alone I expect 1200 watt and additional 300 for the system.

If you expect the system to draw 1500 watts a 1500w PSU is not nearly enough.....you will want at least 1800w. Pushing a PSU to its max rating will both lower the efficiency by a bunch, burn the PSU out more quickly, and most likely cause a bunch of crashes/hangs as the PSU will not be able to regulate its voltage properly at 100% usage. Thats on top of the instability you are building into the system by running too many cards on one board.

That looks like the Asus Prime H270 Plus...I see no supplementary power for all those PCI-E slots. Is that not a concern for your build running 8 cards?

mewhoyou

sr. member

Activity: 353

Merit: 250

Point taken but I will be using 1500 as I will push this with dual mining. Cards alone I expect 1200 watt and additional 300 for the system.

evakka

sr. member

Activity: 700

Merit: 265

Nice trick using M.2 slots!

It's doable to power more than 6 cards with this PSU indeed.
What OS are you going to use?
Just mentioning... I suppose that you are aware that windows 10 consumes more power than Linux distributions...

In any case, I would also suggest to use a "bigger" PSU.
Even if you do all the necessary adjustments to the cards for reducing power, the PSU will work in its limits

Topic: My first 8gpu rig 6 pci + 2 pci m.2 need recommendation on PSU - page 2. (Read 3891 times)