300W GPU in a 250W PSU work?

G9xftw · Dec 9, 2015

Also, will a any GPU at all work in a PSU which does not meet the GPU's Wattage?

If the GPU maker clearly says you need 500W to run their card and if you pair it with a 430W PSU will it work?

Even if it works how will it be different if the same 500W GPU is run on a 500W PSU or a 600W?

PTOWN GAMER · Dec 9, 2015

no it wont work, cause you also need power for other parts like cpu ram and motherboard.

PTOWN GAMER · Dec 9, 2015

here use this power supply calculator. Put in all the parts you have, then at the end it will tell u how much Power you need. once you get the result, buy a psu 100w more than the result.

http://outervision.com/power-supply-calculator

RobCrezz · Dec 9, 2015

Depends on a few factors
1) The quality of the PSU - Can it actually deliver the full 250w on the 12v rail constantly?
2) How much wattage/amps does the card actually require (when they recommend 300w, the card usually only requires 60-70w)

rhysiam · Dec 9, 2015

It's never a good idea to push a PSU out of spec. They're designed to deliver a certain amount of power, and good units will be tested under a range of conditions to ensure they can reliable delivery nice stable power at within their rated conditions. Push them beyond their limits and bad things can happen. Good quality units have a range of safety features which *should* kick in to prevent damage to the PSU itself or components connected to them. They do that by simply hard powering themselves down (like turning the power off to your PC) to prevent damage. If those safety features don't work, or in the case of cheaper/poorly designed units where those safety features don't exist or aren't properly designed, anything can happen. Once components in the unit are pushed too hard they will fail. At best the PSU itself can just self-destruct. At worst they can fail with a power spike that can fry any components they are connected to, or even spark/smoke/flame.

FYI - you need enough power, but every bit as important is getting a decent PSU. Many, many units outright lie about their rated power. Why don't you post your build and your region and we can suggest you a good quality unit that won't cost the earth.

G9xftw · Dec 9, 2015

rhysiam :

I agree. A good PSU goes a long way. I had my CORSAIR GS700 burn out as the stupid government folks were upgrading the grid electronics or something without much clear intimation. I turned on my PC and the PSU goes up in sparks. It took me 10 days to get warranty replacement, free. Though the trip to the center was like $60 overall. My main components were totally safe including my HD7950. So it goes to say quality PSU with good safety features is a must!

I live in India, Navi Mumbai. And FYI- light fluctuations, although quite less now, happen. When they happen you can bet that 30+ houses next to you will have something or the other thats lost. TV, FRIDGE, AC, etc.

Btw my RIG is ready. I am trying to help my friend who has Dell 620S. I tried to convince to just build a new system but he wont budge. So at the least thought could upgrade the 250W PSU to 300W but those units are not at all available. So now he will be running a GT730 (rated at 300W required) on the PSU.

G9xftw · Dec 9, 2015

RobCrezz :

I dont know much about RAILS and stuff....I should really google it!

Its a simple DELL Slim tower PSU Im talking about. Rated at 250W.

How about the Corasir GS700 does it deliver on the 12v rail constantly?

RobCrezz · Dec 9, 2015

G9xftw :

Yes the GS 700 can deliver full 696w (58 amps) on the 12v rail. Cheap PSUs just add up what the can deliver on the 5v and 3.3v rails, and in reality can only offer a fraction of their rated wattage on the 12v rail (pretty much everything runs of the 12v these days).

hang-the-9 · Dec 9, 2015

G9xftw :

The power supply requirement that the video card makers list is always over what you can run it on. Usually there is a %25 or so leeway. But, a bad power supply can be producing much less power than what the sticker lists.

It comes down to general knowledge of power supplies and cards really, and how brave you are. A video card that states "300 watt minimum" may run fine off a 250 watt power supply. It may run fine for years. It may run fine for a few days then burn out the power supply the card and the motherboard. It may run fine for a few weeks then cause random reboots while leaving everything else running fine with no damage. It may not turn on when you try it.

If you want to be safe, do not go much lower than the recommended power supply and do research about the power supply you will be using to see how good it will run on it's rated power.

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