cysquatch33 :
... this is from the extreme outer vision psu calculator, I guess I always assumed this was considered accurate. I just find it hard to believe its that far off
The eXtreme Power Supply Calculator doesn't take into account non-reference design graphics cards nor take into consideration any manual or factory overclocking of graphics cards.
The power consumption values that are used in that calculator are based on a typical gaming load. It doesn't use proper power consumption values if you use the graphics card(s) for GPGPU usage which in the case of the AMD Reference Design Radeon R9 280X is 50 Watts higher than what is reached when gaming.
Heed the warning:
The
recommended total Power Supply Wattage gives you a general idea on what to look for BUT it
is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage.
eXtreme Outer Vision only provides the PSU rail capacities in their Pro version of the calculator that you have to pay to access.
For a
system using a
single Radeon R9 280X graphics card AMD specifies a minimum of a 750 Watt or greater
system power supply. The power supply should also have
a maximum combined +12 Volt continuous current rating of 45 Amps or greater and have at least
one 6-pin and one 8-pin PCI Express supplementary power connectors. There are some non-reference design cards that require two 8-pin PCI Express supplementary power connectors.
For a
system using
two Radeon R9 280X graphics cards
in 2-way CrossFireX mode AMD specifies a minimum of an 1000 Watt or greater
system power supply. The power supply should also have
a maximum combined +12 Volt continuous current rating of 75 Amps or greater and have at least
two 6-pin and two 8-pin PCI Express supplementary power connectors. There are some non-reference design cards that require two 8-pin PCI Express supplementary power connectors so the power supply must have at least four 8-pin PCI Express supplementary power connectors.
This PSU will handle any brand and model of Radeon R9 280X even when overclocked along with an overclocked AMD FX-8320:
http://www.ncixus.com/products/?sku=83583&vpn=120-G2-1000-XR&manufacture=eVGA&promoid=1320
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