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First time build/upgrade, help please!

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Hey guys so a few days ago, my pc decide to stop working, it would boot up but no display, so i figured it was the psu, anyway, the computer itself isnt anything special, so i was wondering, if you guys could advise me on how to upgrade it?

So currently as it stands, my pc is

Acer aspire M3201

AMD phenom x4 9150e
ATI radeon HD 3200 integrated graphics
4gb of ram
320GB hdd

So I was wanting to replace psu for
http://www.ebuyer.com/192111-ocz-fatal1ty-series-550w-m...

and put in a dedicated graphics card this one
http://www.ebuyer.com/255421-gigabyte-gt-440-oc-1gb-ddr...

I wouldnt think id have to upgrade the rest of the system, i would like some recommedations, i dont want to have to spend too much but if need be i will, id only be using it for games such as diablo 3 and other games of the type, but if there was a chance id get something like BF3 id like something that would be able to handle it also, not max settings, not neccisary for me cheers.

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Well the card is compatible with your motherboard. You'll have to measure your current PSU to see how it matches up with the OCZ ( 5.9in x 3.4in x 6.3in (W x H x D) ). All I could find on Acer's spec sheet about the PSU is that it is either a "400 W / 300 W / 250 W power supply". Whether the new one will fit or not awaits your measurement. :) 
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For a system using a single GeForce GT 440 graphics card NVIDIA specifies a minimum of a 300 Watt or greater power supply that has a combined +12 Volt continuous current rating of 22 Amps or greater. Credit goes to Ko888 for the information. :) 

Both the above PSU and the OP PSU are way overkill for that GPU.
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