[SOLVED] Is 450W Enough For This Setup?

[Zencxal]

I am ordering a RX 580 8gb XFX, i3-9100F, 16gb DDR4 (2x8) and a micro atx mobo soon and i have a 450W Power supply and was wondering if it could happen to run this config, Already tried a psu calcualtor, no i3-9400f.

 

[puppyboynate]

I feel like 450 is either very minimum or might not even work but if it does work it wont work very long so you might have to replace it in a year or so

 

[richiestang_78]

Depends on the 450watt PSU. What brand and model is it? If its a no name Chinese or junk brand like Chieftec or Greatwall then no I wouldn't risk it. The 580 can draw a lot of watts under a gaming load.

 

[Zencxal]

Depends on the 450watt PSU. What brand and model is it? If its a no name Chinese or junk brand like Chieftec or Greatwall then no.

EVGA

 

[sizzling]

Even a good quality 450w is pushing your luck, ideally you want 550w. Seeing as using an under powered psu puts the whole system at risk I say don’t try use a 450w.

 

[richiestang_78]

Which model? Brand is sorta irrelevant for power supplies as even a reputable brands such as EVGA puts out some serious junk.

 

[sizzling]

EVGA

And the model?

 

[Zencxal]

Even a good quality 450w is pushing your luck, ideally you want 550w. Seeing as using an under powered psu puts the whole system at risk I say don’t try use a 450w.

What will happen if it post and then shuts off?

 

[Zencxal]

And the model?

I Have No Clue, It Was A Pre-Built And I Never Took Out The PSU, Only Saw The Warrinty Sticker

 

[sizzling]

What will happen if it post and then shuts off?

Worst case is if the psu fails. If this happens any connected parts are at risk of damage.

 

[Zencxal]

Worst case is if the psu fails. If this happens any connected parts are at risk of damage.

Oh, I Did A PSU Calculator. Here Are The Results

 

[sizzling]

Yeah, that’s peak and you should as a rough guide have 1/3 extra headroom when picking a psu. Without knowing the exact model and that this came from a pre-built it’s safest to assume it’s one of EVGA’s crappier units.

Will it work? Probably
Would I recommend it? No due to the risk if it does fail. The psu is the one component that can kill other components if it fails. AMD recommend a 500w and that’s for their base model, it’s possible for faster 3rd party gpu’s to have higher requirements. Personally I’d want a good quality 550w minimum.

 

[Zencxal]

Yeah, that’s peak and you should as a rough guide have 1/3 extra headroom when picking a psu. Without knowing the exact model and that this came from a pre-built it’s safest to assume it’s one of EVGA’s crappier units.

Will it work? Probably
Would I recommend it? No due to the risk if it does fail. The psu is the one component that can kill other components if it fails. AMD recommend a 500w and that’s for their base model, it’s possible for faster 3rd party gpu’s to have higher requirements. Personally I’d want a good quality 550w minimum.

Thank You, I Will Really Look Into It, I Think They Sell Some At Best Buy Near Me. Thank You!

 

[richiestang_78]

Use pcpartspicker.com and look online. Bestbuy is a utter rip off on PC prices. Something like a Corsair CX550/CX550M would be a decent budget option.

Here is a Tier list.

PSU Hierarchy (Dec. 2025) - Power Supply Unit List

Here is the ultimate list-based hierarchy of all power supply units. We've ranked them in 8 different tiers so you can easily find out if your PSU is good!

www.gamingscan.com

 

[sizzling]

Thank You, I Will Really Look Into It, I Think They Sell Some At Best Buy Near Me. Thank You!

Make sure to check reviews before picking a psu. Quality is very important, a good quality 550w is a better choice than a lower quality but higher wattage unit. Also the bronze/silver/gold/platinum ratings are for efficiency and not quality.

 

[Vic 40]

I Have No Clue, It Was A Pre-Built And I Never Took Out The PSU, Only Saw The Warrinty Sticker

Then look into the case. Having 450watts if more than enough if as said the psu is a good quality part.