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Will my power supply be enough for a 7970 GHZ?

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January 18, 2013 10:45:39 AM

Hello,

I've recently purchased a Gigabyte Z77-D3H Intel Z77 Motherboard, a Intel Core i5-3570K 3.40GHz processor and a XFX Pro 550W Core Edition to slap into my computer...I'm now in the market for a top notch graphics card and I've got my eye on a Sapphire HD 7970 VAPOR-X GHZ...Will the power supply will suffice? I had people advise me that it DEFINITELY would on the forums and I've just checked with the supplier I got all the kit from and they said that it wouldn't be enough!

What do all you lot think? I'm still within the return window for the psu so I might just send it back and get a bigger one before I start putting it all together.

Thanks in advance for all the advice!
Sam

More about : power supply 7970 ghz

a b ) Power supply
January 18, 2013 10:55:44 AM

I think it should be enough, the XFX is a seasonic unit so it's a good quality unit.

If you're not comfortable you could return it and get the xfx 650 watt unit which is hybrid modular and would be plenty.
a b ) Power supply
January 18, 2013 11:09:16 AM

i have a 7970 at 1 ghz and a 2600k at 5ghz

the corsair link software for my psu tells you how much power you are drawing

assuming the software is accurate :) 

running prime95 and msi kombustor together

it says i am drawing about 410w
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a b ) Power supply
a b å Intel
January 18, 2013 11:27:24 AM

mikerockett said:
I think it should be enough, the XFX is a seasonic unit so it's a good quality unit.

If you're not comfortable you could return it and get the xfx 650 watt unit which is hybrid modular and would be plenty.

vote for xfx 650. i saw it sold at 59 usd :o 
January 18, 2013 11:45:33 AM

Cheers guy's, Just emailed them about returning it and getting the 650.

Thanks
a b ) Power supply
January 18, 2013 11:54:55 AM

newell said:
Cheers guy's, Just emailed them about returning it and getting the 650.

Thanks


Good choice, it's an excellent unit and will be plenty.

Good luck with your build and enjoy your new comp :) 
January 18, 2013 1:31:38 PM

Eyup, I've had a change of heart and decided that my wallet might benefit from getting the 7950, if that was the case then would I be OK with the 550w powersupply?
a b ) Power supply
January 18, 2013 1:34:46 PM

newell said:
Eyup, I've had a change of heart and decided that my wallet might benefit from getting the 7950, if that was the case then would I be OK with the 550w powersupply?


Once again it probably would be but the 650 would put you in better territory. If you're dropping to the 7950 you could use some of the cash saved and invest into the 650w unit.
January 18, 2013 2:28:57 PM

A quality 550W PSU -- assuming you're getting at least +30A on the 12v rail -- is about right for a 7970 and plenty for a 7950.

7970s are 250W and 7950s are 200W max load. Add in 80W for your CPU, and an overly ambitious 100W for the rest of the system, that leaves you at 430W (7970) or 380W (7950) max power usage -- which you would never approach outside of stress testing. You'd even have a comfortable margin for overclocking.

For reference, I run crossfire 5850s (150W each) and an overclocked i5-2500k (95W) on a 600W PSU with no issue. People vastly overstate what's needed, but looking at the label and doing a little arithmetic is all you need to calculate it. Yes, you don't want to skimp on your PSU, but there's also no benefit to overspending.

edit: I just looked your PSU up. 44A on the 12V rail and 80+ bronze rating... you're completely fine for any single GPU setup.
January 18, 2013 2:39:21 PM

just built a pc for a relative with a i7 3770k and a 7970 (not OC'd) using a seasonic 520 (80+ Pt) and did a test running MoH:WF. Just as long as your PSU is solid (and as previous posters said yours is very solid), 550W is plenty for your system.
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