crossfired 7850 royal kings and PSU

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Matthew Howe

Honorable
Mar 18, 2013
4
0
10,510
Hi all

i've order the parts for my new pc,
i5 3570k
extreme 4 mbo
evo 212
16gb gskill
cxm750 psu

i already have a 7850 2gb royal king and want to know if i'm safe to install another 7850 crossfired on my psu and oc the i5 to 4.2ghz

thanks in advance
 
Solution
ko888
For a system using two AMD reference design Radeon HD 7850 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 39 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors. Some of the non-reference design Radeon HD 7850 graphics cards require at least two 6-pin PCI Express supplementary power connectors for each graphics card so the power supply should have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply...
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ko888

ko888

Titan
Feb 18, 2009
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For a system using two AMD reference design Radeon HD 7850 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 39 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors. Some of the non-reference design Radeon HD 7850 graphics cards require at least two 6-pin PCI Express supplementary power connectors for each graphics card so the power supply should 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) will 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.

The Corsair CX Series Modular CX750M (SKU# 75-002019 / CP-9020061), with its maximum combined +12 Volt continuous current rating of 62 Amps and with four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two Radeon HD 7850 graphics cards in 2-way CrossFireX mode.
 
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