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I have found on shopping sites that small PSUs are little cheaper than 500+ Watts PSU.

So I want to buy the lowest one because I have no plans for adding external GPU.

I would be using 2x8 GB RAMs and Micro ATX motherboard (something like entry level B450 or B550). And I would use only stock cooler and no overclocking.

The official docs of this APU says:

Default TDP: 65W

AMD Configurable TDP (cTDP): 45-65W

I am not sure if there's actually a relation between 65W and the Power Supply I need.

Or if it means the minimum PSU you need for this APU is 65W - I am not really sure.

I also found on a site which recommended minimum 300W power supply for this APU without any dedicated GPU. And the recommendation was a little more (350W) if you want to use some entry level GTX GPU like 1050ti.

But they didn't give any reason for this. But this lead me to conclude that it can be used for less than 500W power supply easily.

So, I would like to know what minimum range of power supply unit for this APU. So that it gives quite the same performance which a higher PSU like 500 or 600 Watts would give.

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Enough is enough. If you can get a quality 300W PSU, that will give you more reliability than a cheapo 600W one. Where I live, quality PSU's don't go as low as 300W, the lowest is 400W. Get them from a reputable brand (NOT aliexpress or Gigabyte, Seasonic or Corsair are better) and preferably with 80+ Gold rating.

BTW the power supply never impacts performance, only reliability and stability.

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  • Yeah I am thinking to buy 400W because they are more easily available as compared to anything lower than that. But thing is, 400W is cheaper than 500W. I would save my money wherever I can. Can you please clarify the reputable brand sentence? It's a bit confusing where you mentioned the brands.
    – Vikas
    Commented Mar 27, 2022 at 13:25
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    When there is not negatively spoken about that brand widely and reviewers use those PSU's, probably safe.
    – Irsu85
    Commented Mar 27, 2022 at 15:11
  • Ok. And if we want to use a dedicated GPU too, we would need more PSU right?
    – Vikas
    Commented Mar 27, 2022 at 15:31
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    Probably yes. For a basic GPU (RX 570) I would reccomend 500W.
    – Irsu85
    Commented Mar 27, 2022 at 15:33

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