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Crossfire 5870's power?

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  • Power Supplies
  • Crossfire
  • Sapphire
  • Components
Last response: in Components
September 14, 2010 12:29:17 AM

I recently got a XFX 650w modular PSU and I have a sapphire 5870, I also have a XFX 5870 on the way. I was wondering if my psu could handle 2 5870's and can I crossfire sapphire and xfx? I think cf 5870's calls for 55a on the 12v and my xfx 650 only has 52a but 624w. I am also running a phenom ii x4 965, which is high power as well. And 8gb(4x2gb) crucial ballistix ddr3 pc3 12800 1600mhz ram. My hd is samsung spinpoit 500gb 7200 rpm sata 2. Under xp 64 bit. Plus 1 old samsung dvd burner, IDE. Motherboard is ta790gx a+3 5.x. This PSU comes with 2 pci e 6 pins built in and 2 more modular, so theres plenty of plugs. Will it work or is it too much power for the 12v rail. Thanks for the info!

More about : crossfire 5870 power

a c 246 ) Power supply
September 14, 2010 12:35:32 AM

Here are the official power requirements for the ATI Radeon HD 5850 and HD 5870 video cards.


ATI Radeon™ HD5850 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

500 Watt or greater power supply with two 75 watt, 6-pin, PCI Express® power connectors.

600 Watt or greater power supply with four 75 watt, 6-pin, PCI Express® power connectors for ATI CrossFireX™ technology in dual mode.


ATI Radeon™ HD5870 System Requirements:

PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard.

500 Watt or greater power supply with two, 75 watt, 6-pin, PCI Express® power connectors.

600 Watt or greater power supply with four, 75 watt, 6-pin, PCI Express® connectors for ATI CrossFireX™ technology in dual mode.

The power supply recommendations are for an entire pc system.

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September 14, 2010 1:02:34 AM

I've read all that but will I want opinions on if it will work, and if you can crossfire sapphire and xfx. I've read on some sights that I don't have enough power in amps on the 12v rail?
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a b ) Power supply
September 14, 2010 1:20:31 AM

You have 52A, which should be enough.
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September 14, 2010 2:27:46 AM

Should be yes but I just got over a random restart problem with new PSU (22a old psu 12v) So I'm not wanting to take any chances! I have seriousy read that I need 55A 12v wil it make a diff?
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a c 246 ) Power supply
September 14, 2010 3:24:28 AM

You will have plenty of power for games like Crysis 1.2 and World of Warcraft. ATI's official recommendation for a pc system with two 5870's in SLI mode is 40 amps on the 12 volt rail.

Take a look at the power consumption results in this Tom's Hardware review of the ATI Radeon 5000 series cards which includes two different 5870's - one with 1Gb of memory and one with 2GB of memory:

http://www.tomshardware.com/reviews/graphics-power-cons...

A pc with the 2GB model maxes out at 329 watts.

Here's a quote from a post I made just about one year ago:

" I read a technical review of the 5870 over at anandtech.com. They measured the total power draw at the wall outlet (mains). That's the total power used by the entire pc. The test system consisted of an Intel Core i7 920 2.6 Ghz overclocked to 3.33 Ghz and just one 5870 and another test with two 5870's in Crossfire mode. They did the test while playing World of Warcarft. The total power draw for the entire system with one card was 295 watts. The total power draw for two cards in Crossfire mode was 430 watts. I knew the new cards were going to be energy efficient. I'm beginning to think the Corsair VX550 could power a moderately overclocked cpu and two 5870's. It's not that far from the ATI recommendation of 600 watts and 40 amps on the 12 volt rail(s) for Crossfire."

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September 14, 2010 10:18:53 AM

Great! Also two different brands doesnt matter? XFX, Sapphire?
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a b ) Power supply
September 14, 2010 11:31:45 AM

Brands doesn't matter if it is a 5 series it can work
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a b ) Power supply
September 14, 2010 7:33:45 PM

There is no problem at all. The XFX XXX Edition can handle two 5870 in CF for sure. It's a high quality PSU made by Seasonic that will provide all the connectors you need. Two 5870 in CF consume 400W at full load, so you have room enough.
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September 14, 2010 7:41:06 PM

Best answer selected by minix69.
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a b ) Power supply
September 15, 2010 4:36:43 AM

This topic has been closed by Mousemonkey
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