|
Title: PSU for 5x7950 Rig Post by: Ultraviolet on May 10, 2013, 06:54:14 AM I've spent a few hours searching but haven't been able to find good answers. How large of a PSU do I need to run a 5x 7950 rig? 1250W or 1500W? If 1500, what are some good models?
Also, can I safely run 1/2 of these on a residential circuit (North America)? Thanks in advance. Title: Re: PSU for 5x7950 Rig Post by: Ultraviolet on May 10, 2013, 01:16:32 PM Bump
Title: Re: PSU for 5x7950 Rig Post by: ewitte on May 10, 2013, 01:43:39 PM There was recently a really good deal on an 850W Seasonic. Using 2x of those shouldn't have any issues. If your overclocking the 7950 your looking at 300-315W each. A normal 15A residential circuit without any other high powered devices on it would handle 1/2 the load just fine 10A shouldn't have issues either.
Either way I doubt your going to be able to find a ("affordable") single PSU that can handle all 5 possibly if you run stock and get the best you can find. Title: Re: PSU for 5x7950 Rig Post by: Ultraviolet on May 10, 2013, 02:06:53 PM Are they really 300W each? When I spent 2 hours searching here/Reddit/Google most of the replies I saw were that I could expect 200-225-250 each. I'm going to be using the Gigabyte cards with the updated bios.
Title: Re: PSU for 5x7950 Rig Post by: ewitte on May 10, 2013, 02:08:24 PM IF you heavily overclock them. With a modest OC you can probably keep them under 250W. Stock is around 205W.
Title: Re: PSU for 5x7950 Rig Post by: Ultraviolet on May 10, 2013, 02:49:46 PM Thanks for the help. How can I accurately calculate for the amps on a residential circuit? I'm looking to build a few rigs so I want to make sure I do it right.
Title: Re: PSU for 5x7950 Rig Post by: Oldie on May 10, 2013, 05:16:05 PM Thanks for the help. How can I accurately calculate for the amps on a residential circuit? I'm looking to build a few rigs so I want to make sure I do it right. Engineering class... Watts = Amps x Volts, so in your case, Amps=Watts/Volts. For 300w on a 120v circuit, that draws 2.5a. On a 20amp circuit, you can theoretically put 2400w Title: Re: PSU for 5x7950 Rig Post by: TheOrri on May 10, 2013, 05:21:29 PM You might want to go safe with a seasonic 1250W, the difference in price isn't that great with a 850W.
|