Bitcoin Forum

Hi, im not sure how much Power i need for a Rig with 6x R9 390


2 x 750 Watt?...

This one maybe:
RHOMBUTECH® 1000 WATT ATX PC-Netzteil | Gaming-Netzteil | Saving Power | Effizient bis zu 89% | Voll-modulares Kabelmanagement | AKTIV PFC | Ultra Silent | 140mm kugelgelagerter Lüfter

Plus

RHOMBUTECH® 800 Watt PC-Netzteil ATX | Gaming-Netzteil | Saving Power | Effizient bis zu 84% | AKTIV PFC | Ultra Silent | 140mm kugelgelagerter Lüfter


Or 2 times one of this two:

FSP FFORTRON Netzteil Aurum 750 ATX 2,3 1X20+4Pin 1X4+4Pin 4X6+2Pin 1X8Pin 8XSATA 5Xmolex 1XFDD 80Plus Gold Cable Management von FSP

oder

Corsair CP-9020082-EU RMi Serie RM750i ATX/EPS Voll Modular 80 PLUS Gold 750Watt, Netzteil, EU von Corsair



Thanks

I don't have a 390 or any AMD cards for that matter so wait for others to chip in but it looks like to me that 2 x 750W PSUs won't be enough, take a look at this:

https://tpucdn.com/reviews/Powercolor/R9_390_PCS_Plus/images/power_maximum.gif

These are the maximum power consumptions during a torture test which is pretty similar to mining.

6 * 323 = 1938 and a PC alone is generally about 70 watts so you're just a tad bit over 2000 watts.
I'd also recommend having 10-20% overhead (depending on PSU quality) so I'd get PSUs that could handle a total of 2200-2400 watts.

Thanks.

I read about that you can reduce the tdp. Not sure what that means in W at the and and in MHS for the R9 390....

I should maybe use the 380... less power. Undervolted I think 190W - 20mhs?

they consume 280w when mining, so you need to lower the tdp to like 70, but then it will be like just running 5 390, but in this way you can buy 1500-1600

This is a great site for getting a general idea how each card performs:

http://62.212.74.86/~mining/list/

And then here's a list of maximum power consumption figures:

http://media.bestofmicro.com/A/7/525247/original/06-Overwiew-Torture-All-Cards.png

Of course I'd recommend doing more research than that.


Yes, Eth is not terribly power hungry but other coins are (eg, Decred) so unless you're only interested in mining Eth, or having a gimped hashrate because of 70% power limit in those more power hungry algos, I'd go for higher capacity PSUs just to be sure. And of course most algos benefit a lot from overclocking as well which again, requires more power.

I have two of them, power consumption really depends a lot of clocks and volts, 100-330W per card. I am running mine overclocked and undervolted 30MH/ 225W each which I think is a sweet spot for them.

If you go 2 PSU way choose at least gold rated ones with 6 x PCIE power connectors so that you don't have to play with splitters and molex adapters.

Playing with volts and clocks is much easier in windows than in linux.

Thank you all.


Im just thinking about the Nano, it use only 150W at 28Mhs i saw.

That test was a few months ago. Hashrate has dropped a little due to the bigger DAG file.

It's more like 26Mh @ 150W.

But more interesting = 22Mh @ 65W with some down clocking.  ;)

Wow 65W?


okay i saw 200W 30mhs
and about 100 W 24-25MH

Maybe the Nano is my solution, but i could not finde someone who put 6 of them in a Rig...

You're talking to him...

Haven't we spoke on IRC?

Toevallig uit Gent?

Or are you a different person? :)

Different person :)

Which language is this?

I'm so confused right now which gpu or psu..

R9 nano
Or 380-390
Or used 280x....

I'm having a hard time believing that.

if you don't buy nano in bulk, they are too expensive

and where i can get them in bulk in eu'?

Atm 95 Nano's running all @ 22Mh per card. (Basically more because i'm doing more than 2.1Ghz)

Complete farm is at exactly 7.6 KW

7.6 KW / 95 = 80Watt (not including mobo's / processors / memory)

Here's a picture of my meter (fusebox only for the farm) at this moment.

https://drive.google.com/file/d/0B_cBBoZ_PTwOVGdod0k2c1dLU3M3NkdFZ3JUY2kxamhxME1Z

A bit unclear because it's dark in here.

Greetings.

Can you tell me which components you are using for you gpu rigs?
5 GPU per rig?
and which brand you use for the gpus?
is it possible to put 6 Nanos?

Thanks

Damn, that's pretty crazy. Without the other components those cards indeed pull 65 watts each.

But, my 970's do 20.5 Mh/s at around 150 watts but they are much cheaper. In fact - at least with the prices available to me - a 970 is paying for itself in 72 days while a Nano will only hit ROI in exactly a 100 days.
That is with $0.15 per kWh. But I'm already at the limit of how much electricity I can pull so I can see why those Nanos are appealing. And if Eth gets out of the picture efficiency once again will be key.

probably not, there are ethereu clone waiting for a pump and decred, other coin are trash

Bought them all in bulk at a very nice price, so your calculation is a bit off in my case :)

6Nano's per rig.

It is not possible for 22MH @65W. The maximum down voltage is -100 mV with MSI afterburner as far as I know.

Ok, if you say so  :)

the R9 390 uses about 250W each when -100mV 1100/1500MHz. So You need at least 1600W for 6x390.

It's about Power Target or TDP Limit or however you want to call it and not voltage.

I have a feeling eliovp uses custom bios too...

In AMD cards, you can only change the voltage to affect the power consumption. For R9 390 it is -100 mV for Afterburner.

 :)

You can pull the bios from the card, mod it manually and rewrite it.

Not that difficult. However, when you do it wrong, you could break it and bye bye to your warranty..

Use to do that a lot when running only on linux.

Thx to Wolf though :-)

Nonsense (https://i.imgur.com/telo1yk.jpg). Not 100% sure that you can reduce it below 100% but I know there's an option to change it.

I made a desicion to use R9 380

Any one expirence in Undervolting them and settings?

You need to use the 4GB version.

http://www.amazon.de/registry/wishlist/1MRLE4E80HZZ2


my rigs. did i forgot something?

i think you're ordering too much stuff that do not contibute to the profit, leave those alone and buy only what is needed, and 1500+1000w seems overkill, are you sure you need that amount?

the 1500w psu is for the 3x r9 390

the 1000w psu are for 6x r7 390

I have one problem, how i connect 6x USB 3.0 Riser to a MOBO?

As i see the H81 got only usb2.0

oh i see..
http://www.ebay.de/itm/PCI-Express-PCI-E-1x-16x-Extender-Riser-Card-mit-USB3-0-SATA-15P-Kabel-Adapter-/361440109402

there is a adapter for the pcie slot?

You don't need 6x usb..you need 6x pci 1x or 16x.

The usb is the connection from the risercard to the pci connection :-)

Thank you :) i saw it to late.

Corsair CP-9020057-EU AX Serie AX1500i ATX/EPS 80 PLUS Titanium 1500Watt, Digital, Netzteil, EU
this one or the Lepa 1600w?
for 4x R9 390?

I own the lepa g1600 and i'm very happy with it.

Up to you..

For 4x390, 1500W is enough.

1500W is even enough for 6x390 if you use the -100mV undervoltage. That will consumes about 220W each.

The 1500W power supplies are usually not single rail, so you have to distribute the power properly among the rails.

That is very important. If the power is not distributed properly and within the limits, the power supply will crash and the computer will restart.

read http://www.corsair.com/en/ax1500i-digital-atx-power-supply-1500-watt-fully-modular-psu

corsair 1500 can be set to operate with single or multiple rail

That is just an exception. I saw quite a few 1200/1250W power supply are single rails. I use the OCZ 1250.