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surphactone (OP)
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May 31, 2013, 05:11:30 PM |
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Hi
which PSU should i buy to run 3 x 7970 , how many watt ?
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fflewddur
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May 31, 2013, 06:10:10 PM |
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I'm running four with a Corsair 1200AX, but you could get away with less. I'd recommend the Corsair AX860i; it's 860 watts and super efficient. Mine is powering two 7950s and never draws more than 415 watts... should be plenty of headroom for three 7970s, especially if you undervolt them a bit.
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Kaepora
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May 31, 2013, 06:22:46 PM |
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Hi
which PSU should i buy to run 3 x 7970 , how many watt ?
850 watts minimum, if you do go with an 850 watt it better be a quality one with some nice beefy rails. |
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Kaepora
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May 31, 2013, 07:01:12 PM |
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Whoa there buddy 1500w is excessive even a 1000w power supply is more than enough. |
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fflewddur
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May 31, 2013, 07:35:06 PM |
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There's absolutely no need for a 1500 watt PSU to run three 7970s. Around 850 will work, but power supplies are a great example of getting what (watt?) you pay for. Just because a PSU draws 850 watts from the wall doesn't mean it converts all of that into usable DC electricity. A cheap one may only only work at 70% efficiency, which leaves you with ~595 watts; a better (read: more expensive) 850 watt PSU should work around 90% efficiency, and give you a clean 760 watts, which is plenty to power three 7970s. |
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surphactone (OP)
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May 31, 2013, 09:44:20 PM |
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thanks all  i will go for a good 850 watts one  |
<!>Help the guy with any amount of BTC : 1FbWe8Dq8cLx3UHF385EtCLyVz6UFXgs8k Thank yO !
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diskodasa
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June 06, 2013, 12:46:51 PM |
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thanks all i will go for a good 850 watts one Any news on 850W PSU with 3 gpu-s? Is it working? Stable...? |
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dracula3
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June 06, 2013, 02:29:21 PM |
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I'm running four with a Corsair 1200AX, but you could get away with less. I'd recommend the Corsair AX860i; it's 860 watts and super efficient. Mine is powering two 7950s and never draws more than 415 watts... should be plenty of headroom for three 7970s, especially if you undervolt them a bit.
Hi, about these 415 watts how did you achieve that? It seems very good, considering each 7950 as 200W. Is this from wall - do you use some kill-a-watt? Or is this number from Corsair software provided with AX860i? |
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Alexander The Great
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June 06, 2013, 02:33:31 PM |
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800-900 watts is perfect.
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artos
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June 06, 2013, 02:37:35 PM |
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PSUs are most efficient at the 80-90% range. So you'll want a 800-850W PSU.
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Alexander The Great
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June 06, 2013, 02:40:27 PM |
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PSUs are most efficient at the 80-90% range. So you'll want a 800-850W PSU.
Yes I agree |
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JohanS
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June 06, 2013, 03:04:42 PM |
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thanks all i will go for a good 850 watts one Nice! GL |
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foxhole
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June 06, 2013, 03:26:52 PM |
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any one of them will do the trick
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Eva Braun
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June 06, 2013, 03:49:45 PM |
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yes anyone of those will do the trick
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skl1
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June 06, 2013, 04:01:18 PM |
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800W of 12v min for sha, and ~900+ of 12v for scrypt
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Eva Braun
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June 06, 2013, 04:07:47 PM |
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800W of 12v min for sha, and ~900+ of 12v for scrypt
I own a 800W, works like a charm |
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lbr
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June 06, 2013, 05:06:02 PM |
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AMD publishes PSU requirements like this because if they said PSU must be able to deliver ~20A on +12V rail nobody would understand what they mean ; ) Also because PSU manufacturers often lie about their PSU specs. I'm running 3x7950 + 2x6950 mining LTC with Enermax 1250W works fine. One of 7950 was even using ~320W until I've noticed it and lowered voltage. PSU = Power Supply Unit ; ) |
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https
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June 06, 2013, 05:15:07 PM |
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sorry but what does PSU stand for?
Power supply unit |
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namecoin
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June 06, 2013, 05:21:16 PM |
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why does scrypt requires more power than sha-256? because we need more ram for scrypt? thank you.  800W of 12v min for sha, and ~900+ of 12v for scrypt
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