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Will my PSU be enough for a 770?

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  • Power
Last response: in Components
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September 24, 2014 2:03:18 PM

Hi, this is my build:

    Intel Core i5-4570 3.2GHz
    G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 Memory
    Samsung 840 EVO 250GB 2.5" Solid State Drive
    2x SATA HDDs can't remember the model or manufacturer.
    Gigabyte GeForce GTX 770 4GB WINDFORCE Video Card
    Cooler Master eXtreme Power Duo 600W


Everything is new, exept for the PSU, which is from my current PC and I wanna know if I can still use or if I need to upgrade. This PSU has been running a Core 2 Quad Q6600 and a GTX260 for quite a while now, if it serves as reference.

The PSU has two 12V rails, each with 18A max. It has 2x 6-pin power PCI-e connectors and 4 molex connectors that I'm not using. The GPU needs 2x 8-pin power PCI-e connectors and came with 2x 2molex-to-8pin adapters, but I guess I could buy other adapters if that might solve the problem (note that curiously the molex-to-pci power adapters have only 6 wires and the other 2 don't even have a pin in the pci power conector. This would suggest that either 8-pin is not necessary or that Gigabyte is really cheap with the adapters they through inside the box).

According to EVGA (couldn't find anything on Gigabyte or nVidia), the recommended system specs are 42A on the 12V rails and 600W. I guess this are general recommendations, but maybe not entirely necessary. I mean, the cpu is relatively non power hungry (certainly less than my current CPU) and my main disc is an SSD, though I do have 2 Sata HDDs, I've no idea how much power they need. The GPU takes 230W, then I = P/V=230W/12V = 19A. My guess is, if I were able to feed the gpu with both rails, then I have 17A for the rest of the system. If I can't, I know I'm toast.

The thing is, how do I know which rail is which? I should expect that each of the PCI-e connectors from the PSU carry a separate rail, but I can't use them since they are 6-pin. I could use the molex to 8 pin but they are also 6 pin really. Wouldn't this put at risk the amp rating of the wires? (I mean, I guess that's the reason why they keep throwing in more pins).

Anyway, is this PSU enough to run the PC? And is there anyway to hook this up without maxing out the 12V rail amp rating or the wires/connectors amp rating?

Thanks in advace!

More about : psu 770

September 24, 2014 2:06:58 PM

I wouldn't use that PSU to power any system. It uses incredibly low end parts and poses a danger to the other parts in the system. A good quality 550w psu would be enough for that system.
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September 24, 2014 3:20:25 PM

SR-71 Blackbird said:
Cooler Master eXtreme Power Duo 600W

It's not sufficient to power a 770 , the 12v combined rails are too weak.

Yours is the top specs.


I'm aware of the 12V rail amp limitation. All I'm saying is that it's not that far off (just 4A, and the gpu actually just needs 19A) and that it probably shoud be enough to run my system anyway, given that my CPU is only 80W or so, it doesn't seem to eat up that much amperage.
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September 24, 2014 3:22:45 PM

I wouldn't do it you might end up taking out other components with that weak power supply , the 770 needs 42 amps.
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September 24, 2014 3:50:25 PM

bignastyid said:
I wouldn't use that PSU to power any system. It uses incredibly low end parts and poses a danger to the other parts in the system. A good quality 550w psu would be enough for that system.


I read the review you posted, it doesn't seem to be thaaat bad. It sure is low end but it was more than enough for my old pc and it never gave any trouble. But from what I read, it's fairly clear that I need a new one :) 

So I checked out the local retailers and this is what I came up with, within a reasonable budget.

Antec Neo Eco 620C
Cooler Master GX650W

They both meet both the wattage and amperage rating. I think the cooler master should be pretty good, but the antec is $20 cheaper. What do you guys think?
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September 24, 2014 3:52:36 PM

Antec Neo Eco 620C

Get this one it's made by SEASONIC , GOOD CHOICE.


Get this one , you want a good PSU powering your card.
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September 24, 2014 3:53:25 PM

The GX is just as bad as the Extreme. The Antec is a good unit, it's made by Seasonic.
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