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Title: How many PSU do i need for 3x7950 Post by: 18RATTT on April 29, 2013, 03:36:10 AM hi there,
im planning to run 3x7950 in 1mb. which PSU is sufficient? 1200W or 1000W is enough to run 3x 7950 ?? how many Watt does 1 card of 7950 run? thank you. Title: Re: How many PSU do i need for 3x7950 Post by: neil_mccauley on April 29, 2013, 03:59:25 AM According to this post: https://bitcointalk.org/index.php?topic=163306.0 an 850W Gold or Platinum is sufficient.
Title: Re: How many PSU do i need for 3x7950 Post by: bcpokey on April 29, 2013, 04:39:10 AM the 80 plus rating has no effect on how much power the PSU delivers to the GPUs.
You would probably be fine with a 750W depending on your overclocks, if you run hard you might look into an 850W. Title: Re: How many PSU do i need for 3x7950 Post by: 18RATTT on April 29, 2013, 09:12:57 AM thanks for the input neil and bcpokey.
however, i was wondering if someone might know how many Watts does a radeon 7950 will need usually?? i heard one card need 300W. but i need some double confirmation. Title: Re: How many PSU do i need for 3x7950 Post by: bcpokey on April 29, 2013, 09:29:49 AM One card definitely doesn't need 300W, that's just ridiculous. How much it WILL use depends on whether you're mining bitcoins, litecoins, or whatever. How much you overclock the sucker, whether you have a good group of asics (power leakage), etc.
On average plan for that they will likely consume 200W +- 25W. Title: Re: How many PSU do i need for 3x7950 Post by: pro on April 29, 2013, 09:43:39 AM iam running 3 7950 on an 1050W gold plus. the system pulls about 800W.
Title: Re: How many PSU do i need for 3x7950 Post by: cimpex on April 29, 2013, 10:12:48 AM 4x 7950 @ 1150/1400 @ 1,25 V mining LTC = 1050-1100 W at the wall.
Title: Re: How many PSU do i need for 3x7950 Post by: Cobra on April 29, 2013, 03:25:48 PM I am running (3) 7950's @1050/1450 @ 1.125 V on a 750w Rosewill 80plus Gold and no problems so far, I am aware of the risks of pushing the limits of a PSU. I am getting 608kh from each card, cgminer 3.1.0, -I 20 -w 256 -v 1 --thread-concurrency 21712
This has been a very stable 1.8Mh system. Open air system, small house fans on cards, 71c temps. Title: Re: How many PSU do i need for 3x7950 Post by: Bitsaurus on April 30, 2013, 05:45:14 AM 4x 7950 @ 1150/1400 @ 1,25 V mining LTC = 1050-1100 W at the wall. Are those Gigabyte 7950s? Title: Re: How many PSU do i need for 3x7950 Post by: ryantc on April 30, 2013, 09:56:50 PM I am running (3) 7950's @1050/1450 @ 1.125 V on a 750w Rosewill 80plus Gold and no problems so far, I am aware of the risks of pushing the limits of a PSU. I am getting 608kh from each card, cgminer 3.1.0, -I 20 -w 256 -v 1 --thread-concurrency 21712 This has been a very stable 1.8Mh system. Open air system, small house fans on cards, 71c temps. ha, that's good to know. Now I can switch my 3*7950s to the HX850 and leave the 1000w for 3*7970s BTW, is Antec 1000 Platinum enough to run 3*7970? (not GHz edition) Title: Re: How many PSU do i need for 3x7950 Post by: trinsic on April 30, 2013, 10:00:50 PM A good 850 will do it, I get 545w from two Sapphire Vapor-X's.
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