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Help with choosing PSU wattage

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  • Power Supplies
  • Components
Last response: in Components
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January 29, 2013 6:01:27 PM

Hello i have a 350 Watt PSU and am trying to save cost will it be up to the job for this build:

i5 3470 CPU

Gigabyte GA-H61MA-D2V, Intel H61 Chipset MICRO-ATX

8 gb ram

AMD HD 7850 1gb MSI OC graphics card

Dvd drive

5/6 fans (maybe led)

2 hardrives

thank Elliot

More about : choosing psu wattage

a b ) Power supply
January 29, 2013 6:08:07 PM

A good 350W psu might do, but it's recommended at least a decent 400W-450W psu.
January 29, 2013 6:09:45 PM

nope it will probably not be enough

a good quality 500W Would be required, could get away with a 450W but probably leave very little headroom

What have you got spare money wise & by the way, go for the 2gb 7850... its price difference is minimal as far as i know.

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a c 311 ) Power supply
January 29, 2013 6:11:22 PM

elliotdyson said:
Hello i have a 350 Watt PSU and am trying to save cost will it be up to the job for this build:

i5 3470 CPU

Gigabyte GA-H61MA-D2V, Intel H61 Chipset MICRO-ATX

8 gb ram

AMD HD 7850 1gb MSI OC graphics card

Dvd drive

5/6 fans (maybe led)

2 hardrives

thank Elliot


Hi - realhardtech suggests 450w for a sys with a 7850, that has some
headroom built in. But, I think 350w is a risk. I might try it
with a top quality conservatively rated unit, but even then I
wouldn't feel too comfy.

What make and model psu is it?

Tom
January 29, 2013 6:15:36 PM

trying to do it all for around £450 on budget really just save money on not buying a supply as i dont think the £20 ones will be any good? And what make 2gb whould i go for? msi?
January 29, 2013 6:18:33 PM

joeh_87 said:
nope it will probably not be enough

a good quality 500W Would be required, could get away with a 450W but probably leave very little headroom

What have you got spare money wise & by the way, go for the 2gb 7850... its price difference is minimal as far as i know.


trying to do it all for around £450 on budget really just save money on not buying a supply as i dont think the £20 ones will be any good? And what make 2gb whould i go for? msi?
January 29, 2013 6:20:06 PM

Any, cheapest possible i guess.

Could you tell us the make of your current PSU, or just look at the sticker on the side and tell us what amps are on the 12V rail.
January 29, 2013 6:25:06 PM

joeh_87 said:
Any, cheapest possible i guess.

Could you tell us the make of your current PSU, or just look at the sticker on the side and tell us what amps are on the 12V rail.



quite old guessing its a no thinking about it!

AOpen atx-350taf
a c 311 ) Power supply
January 29, 2013 6:28:12 PM

elliotdyson said:
trying to do it all for around £450 on budget really just save money on not buying a supply as i dont think the £20 ones will be any good? And what make 2gb whould i go for? msi?


Agree - don't buy a cheapo psu, but I still don't believe you
can run a sys with 7850 on a 350w. As for what brand
gfx card, everyone will have their favorites.
I would say any of these brands should be fine:
Sapphire, XFX, MSI.

You need to solve your PSU dilemma before you install
a 7850.
January 29, 2013 6:29:46 PM

I would advice you not even try that PSU lol

if you really wanted to risk a lower wattage than recommended to save cash i would go as low as 430 only

best option there is http://www.overclockers.co.uk/showproduct.php?prodid=CA... probably cheaper elsewhere!

me personally would go for a 500W just to keep things safe. but then your cost will go up a fair bit.
a b ) Power supply
January 29, 2013 6:30:51 PM

elliotdyson said:
trying to do it all for around £450 on budget really just save money on not buying a supply as i dont think the £20 ones will be any good? And what make 2gb whould i go for? msi?



Don't cheap out on the psu, a good one with 450W like the xfx is good for the system : http://www.novatech.co.uk/products/components/powersupp...

Other note : for that cpu, get a B75 motherboard, some h61 mobos needs the bios updated in order to run the ivybridge cpus.
January 29, 2013 6:34:19 PM

thanks alot, apart from that any more advise on the build? completely new to this wanted to do it to learn more about the computers, so and advise is appreciated :) 
a b ) Power supply
January 29, 2013 6:43:04 PM

Make sure than the ram you're getting is a dual channel kit with 2x4GB with no more than 1.5v
!