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Title: Five R9 280X Power Post by: NameTaken on February 27, 2014, 01:21:28 AM Would 2 750W Gold PSU or equivalent be sufficient for 5 undervolted R9 280X + motherboard on a 15A circuit?
Title: Re: Five R9 280X Power Post by: Axco on February 27, 2014, 02:53:15 PM 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 Title: Re: Five R9 280X Power Post by: atp1916 on February 27, 2014, 03:02:00 PM 1500w total watts... for 5 280x, even undervolted you're sorta riding the line there.
280xs can and will ride up to 300w quickly. Title: Re: Five R9 280X Power Post by: NameTaken on February 27, 2014, 03:03:21 PM 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 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.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 Title: Re: Five R9 280X Power Post by: evansearle42 on February 27, 2014, 03:35:48 PM 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.. Title: Re: Five R9 280X Power Post by: NameTaken on February 27, 2014, 03:38:23 PM 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.. Title: Re: Five R9 280X Power Post by: Equate on February 27, 2014, 04:51:01 PM Go for LEPA 1600 it will power all your 5x 280x
Title: Re: Five R9 280X Power Post by: NameTaken on February 27, 2014, 04:56:06 PM Go for LEPA 1600 it will power all your 5x 280x They are not in stock anywhere in Canada. |