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5x HD7970 PSU recomendation - Page 2

post #11 of 25
I smell a password cracker poke.gif
I would go with 2 750w or the single biggest one you can find.
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post #12 of 25
1- Are they overclocked?
2- Need the rest of system specs, including fans, HDDs, lights ... when you're running 1.8kW systems you need to know exactly what.


As Deafboy said, a multi-PSU setup would be ideal. Each 7970 can pull 300W easily, 400W overclocked ... they've been known to pull 600W under LN2. This will be a major factor in deciding a power supply.

One more thing ... amperage.

Lastly... why 5x 7970s? Just get workstation cards. or a few titans. ofc it depends on the usage. Going mining?
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post #13 of 25
If he wants a good quality 1200w to start it off with, I am trying to sell my Corsair AX1200i since I don't need all that power. Like most people said you would probably want to run at least two PSU's, but mine can certainly get him started. I'd sell it for $275 shipped with box and all cables.
    
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post #14 of 25
Quote:
Originally Posted by karmuhhhh View Post

If he wants a good quality 1200w to start it off with, I am trying to sell my Corsair AX1200i since I don't need all that power. Like most people said you would probably want to run at least two PSU's, but mine can certainly get him started. I'd sell it for $275 shipped with box and all cables.

AX1200 won't cover it. Assuming he's running stock i5-3570k (Complete speculation) with a single SSD ... You're still only leaving 200W per 7970 which just isn't enough.

1200w will not cover this.
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post #15 of 25
Quote:
Originally Posted by dmanstasiu View Post

AX1200 won't cover it. Assuming he's running stock i5-3570k (Complete speculation) with a single SSD ... You're still only leaving 200W per 7970 which just isn't enough.

1200w will not cover this.

I know. I clearly stated it was not enough, but was "enough to get him started."
    
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post #16 of 25
Quote:
Originally Posted by karmuhhhh View Post

Quote:
Originally Posted by dmanstasiu View Post

AX1200 won't cover it. Assuming he's running stock i5-3570k (Complete speculation) with a single SSD ... You're still only leaving 200W per 7970 which just isn't enough.

1200w will not cover this.

I know. I clearly stated it was not enough, but was "enough to get him started."

Tell me why he'd shell out $275 for a PSU that won't suffice tongue.gif
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post #17 of 25
I would also go with either dual PSU's or the LEPA 1600W PSU. If you do go dual PSU's, I'd go with at least dual 800 PSUs or 1200W + 750W. 7970's can pull a LOT.

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post #18 of 25
Quote:
Originally Posted by dmanstasiu View Post

Tell me why he'd shell out $275 for a PSU that won't suffice tongue.gif

Because he'll probably be purchasing around a 1200w + an additional 500-650w anyway? I figured I would make an offer for a good 1200w so he can save some money?
    
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post #19 of 25
If it were me, I'd probably get 2 of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16817171055

Power wise, it's overkill, but if it's going to be running it 24/7 I'd prefer to have plenty of overhead for efficiency reasons and potential expandability if you wanted to add another card.
 
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post #20 of 25
Thread Starter 
The CPU will be drawing not a lot, maybe a sempron 145 I think. No optical drive, flash drive for storage, 1gb ddr3. I assumed he had the free circuit for this project, since he asked me about this..better have him check lol.
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