[SOLVED] Mining rig - PSU Recommendation

[jkrm]

Hello, i just bought 6 RX 580 8GB + ASRock H510 PRO BTC. What PSU setup should I use? I'm thinking in two Corsair RM850 Gold for 3 gpus each, do you guys think its gonna be enough? Or should I buy an 1000w psu for the mobo + 2 gpus and 850w for the rest?

 

[jeremyj_83]

With a TDP of 185W, 230W total system draw on Furmark, you should easily be able to run 3x on an 850W GPU.

 

[jkrm]

With a TDP of 185W, 230W total system draw on Furmark, you should easily be able to run 3x on an 850W GPU.

Yeah, i think im gonna go with this setup.. But I heard one psu is the better option, but a 1000W psu usually has 4 cables with 2 PCIe 6+2 connectors and im not comfortable powering 2 video cards from a single cable..

 

[lordmogul]

If those are 18 gauge cables, they should be able to handle 8A per wire per the PCIe spec.
That makes 16A for a 2 hot wire cable or 24A for a 3 hot wire cable.
So around 192-288W, which is enough to handle the 110-119W the card would pull over it (depending on if you go by the 66W or 75W specification for the motherboard slot) So also the 220-238W of two cards should be okay on a 3 wire cable.

Since you're probably running the cards at maximum efficiency, 185W will most likely not be reached. Even many that game on the card undervolt them and sit closer to 130-150W, which would mean around 65-85W per card on the cable.
I've seen some posts of people mining on 6 of them like you do with around 800-850W total draw with around 80-100W per card.
It's not the amount of cables but the total load on the PSU that will be a factor here. Good old 80PLUS stuff and best efficiency at around 50% load for most units. Which means the double 850W setup would probably more efficient. Or even 850W for 3 cards + Mobo and 750W for the other 3 cards.

 

[jkrm]

If those are 18 gauge cables, they should be able to handle 8A per wire per the PCIe spec.
That makes 16A for a 2 hot wire cable or 24A for a 3 hot wire cable.
So around 192-288W, which is enough to handle the 110-119W the card would pull over it (depending on if you go by the 66W or 75W specification for the motherboard slot) So also the 220-238W of two cards should be okay on a 3 wire cable.

Since you're probably running the cards at maximum efficiency, 185W will most likely not be reached. Even many that game on the card undervolt them and sit closer to 130-150W, which would mean around 65-85W per card on the cable.
I've seen some posts of people mining on 6 of them like you do with around 800-850W total draw with around 80-100W per card.
It's not the amount of cables but the total load on the PSU that will be a factor here. Good old 80PLUS stuff and best efficiency at around 50% load for most units. Which means the double 850W setup would probably more efficient. Or even 850W for 3 cards + Mobo and 750W for the other 3 cards.

That’s all the info I needed man!!! Thank you very much!!

 

[astrologos]

Hey! Can you share how you set up multiple PSUs on this board? I saw something on the ASROCK website about using an adapter to short the ATX sync pins.

Don't want to fry all my GPUs...
Thanks all!

 

[jkrm]

Hello guys, I have one more question! Can I use 1 PCIE cable for two different gpus? Like, one 3060ti and one RX 580 8gb, with the same PCIE cable?

 

[John Chesterfield]

Hello guys, I have one more question! Can I use 1 PCIE cable for two different gpus? Like, one 3060ti and one RX 580 8gb, with the same PCIE cable?

If you want to melt cables then yes, have two graphics cards running off one feed from the power supply. People advise against having a single card on one feed from the power supply, let alone two.

So no, I don't think that's such a good idea. Even though they're not gaming, they're working hard in another way.

 

[jkrm]

If you want to melt cables then yes, have two graphics cards running off one feed from the power supply. People advise against having a single card on one feed from the power supply, let alone two.

So no, I don't think that's such a good idea. Even though they're not gaming, they're working hard in another way.

But Lord sad in the #4 comment that it has no problem! I want to know if I can plug into 2 different gpus! My psu is a RM850x, very good quality cables! And my 580 is drawing 95w, and the 3060ti is drawing 95w.

Now I dont know what to do, some say it has no problem, some say it has. I have 2 RX 580 connected from one PCIE cable and the cable didnt even get hot.. But I dont want to fry all my setup, theres alot of money right there

 

[John Chesterfield]

If the cables don't get hot, then maybe you'd be ok. Probably better if a mining expert comments.

 

[arif1752002m4a1]

Hello, i just bought 6 RX 580 8GB + ASRock H510 PRO BTC. What PSU setup should I use? I'm thinking in two Corsair RM850 Gold for 3 gpus each, do you guys think its gonna be enough? Or should I buy an 1000w psu for the mobo + 2 gpus and 850w for the rest?

People uses Server power supplies.. with custom PCIe connectors.. and they work well too.. but the issue is that.. they loose over current features and 12v short-circuit protection..


I would say Corsair 2* RM850x can run 6 GPUs (3+3 ) as you said to they are RX580s... So Yes.. it will work.. but for future Upgrades.. get 1000 watt units bro..

 

[arif1752002m4a1]

But Lord sad in the #4 comment that it has no problem! I want to know if I can plug into 2 different gpus! My psu is a RM850x, very good quality cables! And my 580 is drawing 95w, and the 3060ti is drawing 95w.

Now I dont know what to do, some say it has no problem, some say it has. I have 2 RX 580 connected from one PCIE cable and the cable didnt even get hot.. But I dont want to fry all my setup, theres alot of money right there

I built a rig with 6 RTX 3060ti (not for my self) with 2* NZXT C7 750 watt PSUs.. no issues faced till then..

 

[jkrm]

I built a rig with 6 RTX 3060ti (not for my self) with 2* NZXT C7 750 watt PSUs.. no issues faced till then..

I'm currently running with 1 5700xt, 4 rx 580 and 2 3060ti.. drawing 1000w from the wall (measured with a wattimeter), so, I think two rm850x is ok..

I'm planning to build another rig with 12 3060ti, do you think two rm1000x will be enough?

 

[arif1752002m4a1]

I'm currently running with 1 5700xt, 4 rx 580 and 2 3060ti.. drawing 1000w from the wall (measured with a wattimeter), so, I think two rm850x is ok..

I'm planning to build another rig with 12 3060ti, do you think two rm1000x will be enough?

I guess 1 1000 watt PSU can handle 4* 3060s (I measured total power draw of 230 watts peak... So even after adding peaks... 230*4 = 920 watts... So 1 1000watts = 4x3060s for 12x3060s you may gonna need 3x1000watt PSUs atleast.... I would say Corsair RM1000x or some good Branded PSUs....