7950 on 400w PSU?

Coltor · Sep 9, 2014

Looking to upgrade brothers PC for his birthday, could I run a 7950 on 400w PSU without trouble?

i7-4770k Liquid Cooling
8GB DDR3 2 Modules
1x Desktop Blue 7,200rpm SATA
3x 120mm Fans
400w PSU (Not sure of the brand, seems to be up to spec though)

Would a 7950 be safe to run?

As an after thought, would a 6970 run on this system?

sincreator · Sep 9, 2014

NO NOT AT ALL! You should look for a good quality 600w for your system if you plan to overclock anything. A 550w if you plan on running stock only. If you plan to overclock AND crossfire the hd7950(r9 280) at some point, you should look at a good quality 850w PSU.

Here is a great quality unit for a good price: http://www.ncixus.com/products/?sku=52174&vpn=SS%2D620GB&manufacture=Seasonic%20Electronics

LukaBoki · Sep 9, 2014

First,if you're not sure of the brand,then it points to a low quality PSU.
http://www.realhardtechx.com/index_archivos/Page362.htm
400W won't be enough for either of those cards.
Any 550W+ Tier 1,Tier 2 Class A or Class B will be enough for your system:
http://www.tomshardware.co.uk/answers/id-1804779/power-supply-unit-tier-list.html
I would recommend the XFX Core 550W,the Seasonic S12II Bronze 520W or Antec HCG 520M
All the best.

oxiide · Sep 9, 2014

Even if it worked, I don't think you'd want to run your power supply so close to its maximum. I'd say that machine needs a new PSU, especially since the rest of it sounds sorta high-end. 850 W is a bit overkill unless you're going for SLI or Crossfire. A high-quality 650-watt PSU is plenty for basically any single-card system, and even that isn't strictly necessary for everyone.

The HD 6970 probably draws more power than the 7950.

LukaBoki · Sep 9, 2014

oxiide :

A quality 550W will suffice.

oxiide · Sep 9, 2014

LukaBoki :

I just said that you really don't ever need more than a good 650 W or so for any single card setup available. Yes, for a mid-range card like this, 550 W will indeed suffice.

AlanWakeFan · Sep 9, 2014

The 7950 draws 200 watts (I have one) & the 6970 draws 250 watts. LukaBoki has given you great advice for a power supply & oxide is correct on the 6970 being more power hungry. A quality PSU is the most important part of your system.

LukaBoki · Sep 9, 2014

oxiide :

LukaBoki :

I just said that you really don't ever need more than a good 650 W or so for any single card setup available. Yes, for a mid-range card like this, 550 W will indeed suffice.

Are you sure about that?

Coltor · Sep 9, 2014

I don't know the PSU because I had it built by someone else.

Thanks for responding so quickly. Figured I'd ask about it here, I had some conflicting information elsewhere that was 2-3 years old.

LukaBoki · Sep 9, 2014

Glad we could help.
Make sure to choose a solution.

oxiide · Sep 10, 2014

LukaBoki :

oxiide :

Are you sure about that?

I'm sure about that, though I'm not considering Titan Z and the R9 295X2 to be "single cards" as they are technically SLI/Crossfire setups.

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