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Topic: Cheap PSU (2x 5850's) EDIT (Read 1002 times)

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June 28, 2013, 01:24:20 AM
#12
Updated OP
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June 21, 2013, 05:01:33 AM
#11
Is it ok to buy them used of Ebay or is that a no no?

If it has 2-3 years of warranty left on it, I'd say go for it.
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June 21, 2013, 04:18:15 AM
#10
Is it ok to buy them used of Ebay or is that a no no?
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In POS we trust
June 21, 2013, 04:06:00 AM
#9
You can calculate the needed size of a PSU with http://extreme.outervision.com/psucalculatorlite.jsp

But remember: You want to run the PSU at 50% load to save energy. So if your PC needs 300 Watt, go with a 600 Watt PSU, especially if it's not a 80plus certified PSU. If you can go for a 80plus platinum PSU.

Efficiency drops by 4-5% at 100% load compared to 50% load, it's not worth paying extra for a 700W bronze unit just to run it at 50% load.
That is true for 80plus PSUs, a cheap noncertified cpu will run at 55 - 60% efficiency. Let's say your computer needs 300 Watt. The cheap PSU will pull 545 watt (at 100% load and 55% effiecency) from the socket, while a 80plus platinum PSU will only pull 319 Watt (at 50% load and 94% efficiency). If you run both 24/7 for a year then the differency per year is 1974.34 kW/h. Here in germany where we pay around €0.26 (about $0.19) per kW/h, so a platinum PSU saves me €513,32 (about $375,12) per year over a cheap PSU at full load. From that money I could buy 2 more platinum PSUs.
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June 21, 2013, 03:49:55 AM
#8
Would a Corsair TX850 Enthusiast Series V2 be to overkill? (I might add another GPU later)

For the same money you can get a Superflower 800W Golden Green, or Coolermaster Silent Pro Gold 800w.
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June 21, 2013, 03:41:32 AM
#7
Would a Corsair TX850 Enthusiast Series V2 be to overkill? (I might add another GPU later)
full member
Activity: 196
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June 21, 2013, 03:35:24 AM
#6
You can calculate the needed size of a PSU with http://extreme.outervision.com/psucalculatorlite.jsp

But remember: You want to run the PSU at 50% load to save energy. So if your PC needs 300 Watt, go with a 600 Watt PSU, especially if it's not a 80plus certified PSU. If you can go for a 80plus platinum PSU.

Efficiency drops by 4-5% at 100% load compared to 50% load, it's not worth paying extra for a 700W bronze unit just to run it at 50% load.
full member
Activity: 140
Merit: 100
In POS we trust
June 21, 2013, 03:31:42 AM
#5
You can calculate the needed size of a PSU with http://extreme.outervision.com/psucalculatorlite.jsp

But remember: You want to run the PSU at 50% load to save energy. So if your PC needs 300 Watt, go with a 600 Watt PSU, especially if it's not a 80plus certified PSU. If you can go for a 80plus platinum PSU.
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Activity: 196
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June 21, 2013, 03:31:12 AM
#4
It's a little dated but it should be enough for a 5970.
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June 21, 2013, 02:26:57 AM
#2
Even a 450W Seasonic G series/Rosewill Capstone 450 will do, but for peace of mind get the 550W version.
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Activity: 812
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June 21, 2013, 12:34:50 AM
#1
So, I have bought myself 2x 5850's and I was wondering if one of these would do: http://www.gigabyte.com.au/products/product-page.aspx?pid=2796#kf (I know it's pushing it if at all but I have one on hand)
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