Is a Corsair CX430 enough for an HD7850???

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Darkmonk

Darkmonk

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Nov 2, 2012
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Hi guys!
I know that AMD suggests a minimum of 500W for the HD7850. Will my Corsair CX430 be enough?
I have:
Mobo Asus P8H77-V
CPU Intel I3 3220 (Ivy Bridge)
8GB DDR3 1600MHz
2 optical drives
2 LED
3 fans (incl. one LED)
Keyboard
Gaming Mouse
2.1 speakers
2 USB peripherals (phone and headset)

It is now sufficient for my HD7770, but this card isn't enough, I want to upgrade to a HD7850. eXtreme power supply calculator http://extreme.outervision.com/psucalculatorlite.jsp ends up with around 430W recommended... What do you think?
 
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tenaciousk

tenaciousk

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Jan 18, 2013
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The 7850 requires that the power supply should have a combined +12 Volt continuous current rating of 24 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

Cx430 output
+3.3V@20A, +5V@20A, +12V@32A, -12V@0.8A, +5VSB@3.0A

You would have a +12v rail with 32 amps.
 
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Darkmonk

Darkmonk

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Nov 2, 2012
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But when you visit the sticky post " Power Supply Guides and UPS info" and click on "How to determine how much power you need", you then get the information on how to calculate. But the example allows 15 amps to the rest of the PC and 5 amps as a safety margin. Following the same line of thought, I'd have 24 amps (gpu) + 15 amps (rest of pc) + 5 amps (safety margin) = 43 amps needed... which sounds ridiculously high!!! Should I allow only 8 amps to the rest of the pc???
 
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ko888

ko888

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Feb 18, 2009
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The Corsair CX430 is electrically sufficient.

There are some non-reference design Radeon HD 7850 cards that require two 6-pin PCI Express supplementary power connectors. If you happen to buy one of those you will have to use a dual 4-pin Molex to 6-pin PCI-E adapter cable since the CX430 only has one PCI Express supplementary power connector.
 
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ko888

ko888

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Feb 18, 2009
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An AMD reference design Radeon HD 7850 only draws around 8 Amps from the +12V rail under maximum GPU load.

Graphics card manufacturers allow another 15 Amps on the +12V rail to power the rest of the system. This is based on a PC configured with an Intel Core i7-3930K 3.2GHz 130 Watt TDP processor that is much more power hungry than your i3-3220 system configuration.
 
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