Topic: PSU needed for 3 x HD 7970 (Read 1395 times)
Corsair has great products
1200W should be safe.
You could also just get a lower wattage Gold (which are usually cheaper) and buy a PSU adapter so both power supplies turn on at the same time. Else for 3x 7970s I'd suggest at least a 1400W Gold to give you some headroom since most PSUs are not rated for their 100% capacity for more than a few seconds.
850 is enough and i would use corsair just preference 
Around 1000w should be OK. Preferably Gold certified.
850-1000W 
I guess the figures are accurate.
And yes, more ram should be the reason for different power requirements.
And yes, more ram should be the reason for different power requirements.
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
At least 1500W because of this http://www.amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#2
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 ; )
800W of 12v min for sha, and ~900+ of 12v for scrypt
I own a 800W, works like a charm
800W of 12v min for sha, and ~900+ of 12v for scrypt
yes anyone of those will do the trick
any one of them will do the trick
thanks all 
i will go for a good 850 watts one
i will go for a good 850 watts one
Nice!
GL
PSUs are most efficient at the 80-90% range. So you'll want a 800-850W PSU.
Yes I agree
PSUs are most efficient at the 80-90% range. So you'll want a 800-850W PSU.
800-900 watts is perfect.
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?
thanks all
i will go for a good 850 watts one
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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