Help with choosing PSU wattage

A good 350W psu might do, but it's recommended at least a decent 400W-450W psu.

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.

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

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?

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?

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

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.

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.

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.

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  

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