Five R9 280X Power

[NameTaken]

Would 2 750W Gold PSU or equivalent be sufficient for 5 undervolted R9 280X + motherboard on a 15A circuit?

[Axco]

I allowed 360 watt per card when I chose my psu's  I am running 6 R9 280x on 1 rig and 2 on another

So if you say 360w x 5 cards = 1800w plus what ever you will use for your cpu or ssd etc

If you take my rig that runs at 2000w and say 6/2000 = 333.333333 you could go 5 x 333.33333 = 1666.665watts

I have read that these cards will only pull 300 watts per card though, but my 6 card rig pulls ave 1950 - 2000watts, but I use an ssd drive and a 54watt cpu, and use powered riser cables.

Hope this helps, may be go with 2 x 850 psu's

[atp1916]

1500w total watts... for 5 280x, even undervolted you're sorta riding the line there.

280xs can and will ride up to 300w quickly.

[NameTaken]

I allowed 360 watt per card when I chose my psu's  I am running 6 R9 280x on 1 rig and 2 on another

So if you say 360w x 5 cards = 1800w plus what ever you will use for your cpu or ssd etc

If you take my rig that runs at 2000w and say 6/2000 = 333.333333 you could go 5 x 333.33333 = 1666.665watts

I have read that these cards will only pull 300 watts per card though, but my 6 card rig pulls ave 1950 - 2000watts, but I use an ssd drive and a 54watt cpu, and use powered riser cables.

Hope this helps, may be go with 2 x 850 psu's

Voltage in North America is between 110 and 120 so a 15A circuit have a max output of 1800W AC. I have heard of people running 4 280X on a 1200W PSU. Undervolting 5 cards will reduce the draw by 100W and in conjunction with 90% efficient PSUs, it should be at about 80-85% of 15A limit.

[evansearle42]

Would 2 750W Gold PSU or equivalent be sufficient for 5 undervolted R9 280X + motherboard on a 15A circuit?

answer is yes iif you don't overclock too much..

[NameTaken]

Would 2 750W Gold PSU or equivalent be sufficient for 5 undervolted R9 280X + motherboard on a 15A circuit?

answer is yes iif you don't overclock too much..

Hashrate would drop if core is overclocked more than 50MHz.

[Equate]

Go for LEPA 1600 it will power all your 5x 280x

[NameTaken]

Go for LEPA 1600 it will power all your 5x 280x

They are not in stock anywhere in Canada.