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Khabel
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Can I just purchase anyone from ebay with the right wattage or are some better quality than others?
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There are also different wattages of picoPSUs, different voltage input ranges and different AC adapter plugs to be aware of as well.
What components do you want to power with a picoPSU? I can help you get the right size picoPSU and AC adapter.
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Khabel
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I'm in the process of selecting the parts to replace my current system which is about 4 years old with the new system being based on a i3 haswell, Wesena E4 case and a 840 SSD using the onboard GPU.
It will be dual booting Openelec/Win7 and doing nothing else so I was thinking 120w PicoPSU?
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The 90W picoPSU with 90W AC adapter would be a great choice for that. The picoPSU 90 comes with a built-in CPU power plug whereas the picoPSU 120 does not so one less cable and one less thing to buy. To compare, I ship the 84W AC adapter with i3-3225 system and it max's out at 70W while usually hovering between 30-40W under normal usage. I would expect the same from Haswell since it's also 22nm.
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Khabel
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Thanks for the advice, much appreciated