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Will a Corsair cx430 power a Radeon 6870?

Last response: in Components
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Will the Corsair cx430 safely power the 6870?

Total: 15 votes (2 blank votes)

  • Yes.
  • 62 %
  • No.
  • 24 %
  • I don't know.
  • 16 %
December 24, 2011 4:42:32 AM

Hello,
I recently ordered a PC with a Corsair cx430 PSU and a Sapphire Radeon 6870. I didn't research the PSU extensively since I was in a hurry, but from the PSU calculators and googling I came to this conclusion.
Powered Components:
Intel i3-2100
1 SATA HDD 7200RPM
2x 120mm fans
2x4GB sticks of DDR3
Mouse & Keyboard
DVD Burner which I'll pull out after installing Win7
Sapphire Radeon 6870 - TDP 150W
The calculator recommended me 412W with 50% capacitator aging and under 300W without. People usually recommend the 500W, what do you think?
a b ) Power supply
December 24, 2011 10:20:24 AM

Yes. I don't know what calculator showed you 412W on your system, because your don;t have more than 300W at max 350W when you play games and everything is maxed out.I calculated my system power usage an i have 357 W .Don't put the capacitor aging. Because if i put that my pc consumes 616W and that is mean my power supply can't handlle because is 620W.
a c 273 ) Power supply
December 24, 2011 1:09:59 PM

Problem with that combo is the psu only has one PCI-E connector.
A 6870 requires 2 PCI-E connectors.
Exchange the CX430 for a CX500 which has 2 PCI-E connectors.
That would be why a 500W unit is recommended.
Related resources
December 24, 2011 2:51:02 PM

^Listen to davcon. He's got it right.
December 24, 2011 3:40:09 PM

Yeah, it should, but as said before, you need more PCI-E connectors, as would a Antec Earthwatts 380W PSU.

I would recommend a XFX 450W Core Edition 80 Plus Bronze PSU, it's usually cheaper, puts out the EXACT same power output on the +12V, is OEM'ed by Seasonic and has a longer warranty than the CX500. It also has two 6pins already, which is what I'm running my HD 6870 off of.

a c 1108 ) Power supply
December 24, 2011 7:47:15 PM

For a system using a single Radeon HD 6870 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 24 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Even the Seasonic S12 II Bronze 430W (S12II-430 Bronze), with its combined +12 Volt continuous current rating of 30 Amps and with one 6-pin and one 6+2 pin PCI Express supplementary power connectors is sufficient to power your system with a single Radeon HD 6870.

You may find power supplies on the market that supply more than enough Wattage to run the system. However, many of them lack the Amperage capacity on the critical +12 Volt rail, which is necessary to properly power the critical components in the system (i.e. CPU and GPUs). This is the reason why graphics card manufacturers overestimate the power supply wattage, usually by at least 50 Watts, to take into account those power supplies that have weaker +12V rail(s).
December 25, 2011 1:07:19 PM

Let's say I'm sort of in a complicated situation. Will two SATA -> Molex -> PCI-E do the the trick?
I just checked another website, it mentions the cx430 has 4 Molex connectors. Is this true? On Johnny Guru it doesn't mention any Molex connectors.
Bear with me, I'm on a slow connection atm.
a c 87 ) Power supply
December 25, 2011 1:25:05 PM

Jonnyguru doesn't mention Molex connectors because they are properly known as peripheral connectors. IIRC Molex is a brand name who makes other types of connectors as well.

The CX430 only has three peripheral connectors.
December 27, 2011 1:12:35 PM

I read it up on a wikipedia page, once I had access to the internet again. Thanks anyway.
December 29, 2011 12:36:46 PM

I know this might sound stupid, but will OCing the Radeon 6870 bring up it's power draw too high for my PSU? Is there any way to check if my PSU is doing well?
I know that it would be better to invest into a 500W PSU. It wouldn't hurt to try though.
April 15, 2012 11:05:33 AM

How's it going for you? An update would be help with conclusiveness on this issue. 28A on the CX430 V2 seems like it should be good enough to me. That's 336A on the +12V rail.
!