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How much wattage is needed to run two Radeon HD 7870s?

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  • Power Supplies
  • Computers
  • Components
  • Graphics Cards
  • HD
  • Radeon
Last response: in Components
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December 10, 2013 12:47:43 PM

I am building a computer with 2 Radeon 7870s and was wondering if a 600W PSU would be enough?

Here is a link to the build (without the cards as they are a separate order)

Thanks in advance!

More about : wattage needed run radeon 7870s

a b U Graphics card
December 10, 2013 12:51:37 PM

i wouldn't try it with only 600w, i'd say 750w atleast and if ur desperate 700w
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a b ) Power supply
a b U Graphics card
December 10, 2013 12:52:21 PM

I see no link, but even without, no, that PSU is not sufficient. I recommend a quality 750w PSU to support those cards.
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a b U Graphics card
December 10, 2013 12:52:39 PM

I personally wouldn't attempt it with anything less than a good 800w psu. you still have other hard drives etc to power.
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Best solution

December 10, 2013 12:54:52 PM

hey,
the AMD Radeon™ HD 7870 GHz Edition specifications on the AMD website say this: 600W power supply (or greater) with four 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
so 600 should be enough according to the site but getting a bit better PSU would definitely be better, more like 750+ watt.

hope i helped. :D 

source:
http://www.amd.com/US/PRODUCTS/DESKTOP/GRAPHICS/7000/78...
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a c 2354 ) Power supply
a c 891 U Graphics card
December 10, 2013 3:43:06 PM

A high quality 650w will Crossfire 7870's easily.
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a c 1205 ) Power supply
a c 566 U Graphics card
December 10, 2013 3:51:08 PM

For a system using two AMD reference design Radeon HD 7870 GHz Edition graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 40 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
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