660w PSU okay for 7970GHZ OC'd?

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Subyman

Subyman

Moderator <br> VC&G Forum
Mar 18, 2005
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I ran a heavily over clocked watercooled 7970 on a 660W Seagate Platinum without any issues. I had an overclocked 3570k as well.
 
lehtv

lehtv

Elite Member
Dec 8, 2010
11,897
74
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Technically you could run dual 7970 GHz off of that unit and not have any issues
According to a review I read OC'd it will take ~560w at load.
Click to expand...

Where did u you read that?
 
lehtv

lehtv

Elite Member
Dec 8, 2010
11,897
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The second link which is HardOCP doesn't even show a 7970 GHz edition, they are all regular 7970.

The numbers are not for the card itself, they are for the entire system.

The test system used has a much more power hungry CPU than the CPU you're using, you can safely take about 50W off of those numbers, if not more. In addition, the overclock achieved by HardOCP involves a heavy voltage increase, while you will be able to overclock the card quite nicely without much overvolting. Overvolting accounts for most of the power consumption increase.

The watts shown are measured at the wall, so power supply efficiency is not accounted for. 562W is what the system is drawing from the wall, but the amount the PSU is supplying to the components is about 562W * 0.85 = 480W using the 80+ bronze 800W unit in the review.

So for a system using a moderately overclocked 7970 and your 3770K, power consumption will be less than 400W
 
Last edited:
lessthanuthought

lessthanuthought

Senior member
Aug 29, 2009
327
0
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lehtv said:
The second link which is HardOCP doesn't even show a 7970 GHz edition, they are all regular 7970.

The numbers are not for the card itself, they are for the entire system.

The test system used has a much more power hungry than the CPU you're using, you can safely about 50W off of those numbers, if not more. In addition, the overclock achieved by HardOCP involves a heavy voltage increase, while you will be able to overclock the card quite a lot already with much lower voltages. The additional voltage alone accounts most of the increased power consumption when comparing the Overclocked and Stock columns.

The watts shown are measured at the wall, so power supply efficiency is not accounted for. 562W is what the system is drawing from the wall, but the amount the PSU is supplying to the components is about 562W * 0.85 = 480W using the 80+ bronze 800W unit in the review.

So for a system using an OC'd yet not overvolted 7970, and your 3770K, power consumption will be about 350W
Click to expand...

Ah okay. Makes much more sense. Thanks for the informative response.
 
3

3DVagabond

Lifer
Aug 10, 2009
11,951
204
106
Like others have said, that PSU will handle anything you can throw at it with that system easily.
 
R

Rvenger

Elite Member <br> Super Moderator <br> Video Cards
Apr 6, 2004
6,283
5
81
I just popped in my Ebay 7970 into my Bitfenix prodigy to test. 600w Silverstone Strider that cost me $50 a year ago. Handles it just fine too bad this card will be FS soon since it seems that I buy too many of them lol.
 
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