Power supply for 6x R9 390

[blg42598]

How much power would all those draw mining? I might have a mix between R9 390 and one or two 390x.

North America outlets

[adaseb]

You will probably need at least 2 PSUs or one big 1500W or 1600W PSU which won't be cheap.

Actually you will need at least 2 PSUs since there are no single PSU out there with 12 PCIe connectors.

[blg42598]

You will probably need at least 2 PSUs or one big 1500W or 1600W PSU which won't be cheap.

Actually you will need at least 2 PSUs since there are no single PSU out there with 12 PCIe connectors.

Ok thanks. I might go with two 1000W PSUs then.

[Amph]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

[Q_R_V]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

[bathrobehero]

EVGA Supernova G2 1300W has 6 VGA aux power slots and if you buy additional cables you can get 6 times 8 + 6+2 cables. But 1300W is really pushing it and you won't get those cables by default.

Getting two power supplies is probably your best bet.

[Amph]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

[blg42598]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

Which new GPUs have that? Less connectors

[Amph]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

Which new GPUs have that? Less connectors

1070 g1 gaming and 1080 g1 gaming have 1 8 pin only, the 480 will likely be the same, since they all consume very little

[philipma1957]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

Which new GPUs have that? Less connectors

r9 nano use 1     8 pin  and can  do around 180 watts for 25mh stock  but they are costly.

I have 4 at 500 each  I do 720 watts and 101mh

settings are -80   1000 500

[blg42598]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

Which new GPUs have that? Less connectors

r9 nano use 1     8 pin  and can  do around 180 watts for 25mh stock  but they are costly.

I have 4 at 500 each  I do 720 watts and 101mh

settings are -80   1000 500

That's really good. I might get those.

[blg42598]

Or would it be better to get something like R9 380? with lower cost and power with a slight drop in hashrate

[Kellor]

For the 390, if you use -100mV, 1060/1125 MHz, it will consume about 220-240W each. If you use 970/1000, -200 mV, it will consume 160-170 W each.

[Lucky - Luciano]

You will probably need at least 2 PSUs or one big 1500W or 1600W PSU which won't be cheap.

Actually you will need at least 2 PSUs since there are no single PSU out there with 12 PCIe connectors.

         There is (I have it), and with 14 PCI-e connectors: Super Flower Leadex Platinum 2000W (8 Pack). More info on: http://www.kitguru.net/components/power-supplies/zardon/superflower-leadex-platinum-8-pack-edition-2000w-review/   and https://www.techpowerup.com/reviews/SuperFlower/SF-2000F14HP/1.html . These are pictures of my power supply:
    
    

[antantti]

Two PSU 1000w minimum each.

[Tmdz]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

But there is still not enough pcie connectors.

this is the reason why i like the new gpu, they come with 1 x 8 pin only, no more 8+6 crap

Which new GPUs have that? Less connectors

1070 g1 gaming and 1080 g1 gaming have 1 8 pin only, the 480 will likely be the same, since they all consume very little

The 480 only uses 1 6 pin power connector 

http://images.anandtech.com/doci/10389/9310_ellesmere_cam4_02_0010_4K.jpg

Awesome because 6 pins are easier to come by if you have some older psu units laying around.

[s1gs3gv]

r9 nano use 1     8 pin  and can  do around 180 watts for 25mh stock  but they are costly.

I have 4 at 500 each  I do 720 watts and 101mh

settings are -80   1000 500

That's really good. I might get those.

Unless you need something immediately it'd probably be worth waiting to check out the new R9 480, release date is the 27th iirc.

[BitTraderCute]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

if i do it any risk ? hashrate down ? or anything?

[blg42598]

r9 nano use 1     8 pin  and can  do around 180 watts for 25mh stock  but they are costly.

I have 4 at 500 each  I do 720 watts and 101mh

settings are -80   1000 500

That's really good. I might get those.

Unless you need something immediately it'd probably be worth waiting to check out the new R9 480, release date is the 27th iirc.

Yeah, I saw that when I was reading the forum. I'll wait and try to buy around ten R9 480s if they are $200 a piece. Does anyone know if there will be preorders?

[Amph]

just undervolt to -100mv, and you will be fine with 200w max for each of those 390, so a 1500 will be enough

if i do it any risk ? hashrate down ? or anything?

the ratio will be in your favor between the hash and the consumption, you will lose soemthing, but it will be worth it, just be sure that the gpu will not be unstable