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Corsair 650TX enough for 5870 in Crossfire

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January 20, 2011 5:25:54 PM

I currently have a Corsair 650TX and a 5870 1GB and am thinking of going crossfire because 5870's are dropping in price. My question is will my PS be enough or do I need a 750+.

Here is my current PS:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

My rig:
HAF 922
i5 750 @4.0
Scythe Mugen 2
eVga p55 LE
8GB g.skill ripjaws DDR3 1600
XFX 5870 1GB
WD Raptor 10,000 150GB
WD Caviar 7200 320GB
WD Green Caviar 7200 1.5 TB
3 x 200mm fans
2 x 120mm fans
Zalman 6 fan controller
a b ) Power supply
January 20, 2011 5:36:13 PM

You might be pushing it w/2 5870's. I'd prefer a 750 or bigger myself to be safe.
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a c 144 ) Power supply
January 20, 2011 5:41:01 PM

Yes. You will not have a lot of capacity in reserve though.

Figure 25 amps for the video cards and 10 amps for the OC'd CPU. That's about 420 watts. 80 - 90 watts for the motherboard and memory. 50 - 60 watts for the hard drives. Fans - about 20 watts.
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January 20, 2011 5:57:26 PM

Ok, I can probably get rid of my 320GB HDD and a 120mm fan to save a few watts.
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a b ) Power supply
January 20, 2011 6:02:45 PM

Trialsking said:
Ok, I can probably get rid of my 320GB HDD and a 120mm fan to save a few watts.


In terms of power usage by the video cards, you'd only be freeing up 10-15 watts, 1.25 amps.
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January 21, 2011 7:16:24 PM

Best answer selected by trialsking.
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