Need help looking for a budget PSU for RX 580 8GB

According to this:
http://www.realhardtechx.com/index_archivos/Page362.htm
the RX580 needs a 550 watt PSU, so you are right to replace your old PSU. I would recommend a 550-650 watt unit from tiers 1, or 2 (certainly no lower than 3) of this list:
https://linustechtips.com/main/topic/631048-psu-tier-list-updated/

Remember this;The PSU is the heart of your system, without it NOTHING works! it is the only component that, if it fails, can destroy ALL of your other components. Never "cheap out" on the PSU, it is false economy.

That being said, I am sure that you can find a suitable PSU on the list for your budget.

Completely agree with above but will add a poor quality psu can also reduce the life of other components if it doesn’t provide a clean voltage regulation.

The fact that there are so few reviews from ANYBODY of this PSU is troubling, as is the fact that the best Zalman PSU mentioned in the tier list is no better than a tier 3 unit leads me to be skeptical of its quality. I personally would not use the Zalman. What other brands of PSU are available to you locally?

The Thermaltake is in the tier list, at tier 6, just above the "Do not use for anything computer related!" tier. As a PSU, it makes a good doorstop, as long as you promise not to plug it in!

The LC only has 40 amps on the +12 volt rails, (which is what your GPU will use) or a total of only 480 watts, You need at least 550 watts for your GPU and the rest of your system.

I hate to keep shooting you down here, but are you shopping by price, or quality? I am going to say this again:
The PSU is the heart of your system, without it NOTHING works! it is the only component that, if it fails, can destroy ALL of your other components. Never "cheap out" on the PSU, it is false economy!

So, you think you can't afford anything better. I ask you, can you afford to replace your whole build? That is EXACTLY what you are flirting with if you use any of the ones you've asked about.

Of those, I would rank the Corsair unit first, the FSP second and the coolermaster third. Any PSU self described as "lite" would be questionable at best, as we don't know what, exactly, is "lite" about it.

Again, the Corsair, if it is the grey label (not the green!), is one of the better budget PSUs out there.

That is, indeed, the version of the Corsair to get.
Here's the deal: Seasonic makes their own PSUs, and Corsair gets other manufacturers (including Seasonic) to make their PSUs. At the same price point, I would choose any Seasonic over a Corsair, The ONLY downside to the Seasonic S12II is that it is an older design. Since you are running an I5-4440, that is not a bad thing, and when the S12IIs came out, they were the top rated PSUs. The fact that they have more power available (620 watts vs. 550 watts) makes it a no-brainer to get the Seasonic.

Seasonic makes their own PSUs, and Corsair gets other manufacturers (including Seasonic) to make their PSUs.

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And? How is that in any way relevant to the end product? The best PSU on the market is the Corsair AX1600i, manufactured by Flextronics. Perhaps the middleman adds a little to the cost, but Corsair designs/helps design their PSUs.

I would choose any Seasonic over a Corsair

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What does brand have to do with anything? OEM might have importance in soldering quality and consistency, even then manufacturers have different "lines", each with more or lesser care put into the series.
Disregard brand. What matters is the final product.

The ONLY downside to the Seasonic S12II is that it is an older design.

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Group regulated, therefore no support for Haswell C6/C7 sleep states, and loose voltages in crossload like in modern computers. Voltage regulation in the PSU isn't good either.
Lack of protections due to low end 8-pin protection IC, HY-510N.

and when the S12IIs came out, they were the top rated PSUs.

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They were regarded just good 7 years ago. Even then the design was considered out-dated. Take the HCG 520 review based on the same S12ii platform:

Bottom line, if you are on a tight budget, don't have a problem with non-modular PSUs and your power needs are covered by a 520W PSU then you should definitely take a look at HCG-520 since it offers decent performance, is backed by a three year warranty and comes at a good price.

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On the other hand, the Corsair CX series is basically better in every way.

The fact that they have more power available (620 watts vs. 550 watts) makes it a no-brainer to get the Seasonic.

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Completely unnecessary wattage (only 30W more on the important 12V rail) does not make up for lesser electrical performance and lack of protections.

The CX550 is definitely the better choice.

I was wondering when you might show up.

And? How is that in any way relevant to the end product? The best PSU on the market is the Corsair AX1600i, manufactured by Flextronics. Perhaps the middleman adds a little to the cost, but Corsair designs/helps design their PSUs.

What does brand have to do with anything? OEM might have importance in soldering quality and consistency, even then manufacturers have different "lines", each with more or lesser care put into the series.
Disregard brand. What matters is the final product.

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Historically, there are more bad Corsair PSUs than bad Seasonic, so to a certain extent, brand IS important.

Group regulated, therefore no support for Haswell C6/C7 sleep states, and loose voltages in crossload like in modern computers. Voltage regulation in the PSU isn't good either.
Lack of protections due to low end 8-pin protection IC, HY-510N.
They were regarded just good 7 years ago. Even then the design was considered out-dated. Take the HCG 520 review based on the same S12ii platform:

Bottom line, if you are on a tight budget, don't have a problem with non-modular PSUs and your power needs are covered by a 520W PSU then you should definitely take a look at HCG-520 since it offers decent performance, is backed by a three year warranty and comes at a good price.

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On the other hand, the Corsair CX series is basically better in every way.


Completely unnecessary wattage (only 30W more on the important 12V rail) does not make up for lesser electrical performance and lack of protections.

The CX550 is definitely the better choice.

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Admittedly, the Corsair is a more modern design, but I submit that the build in question is NOT. You can put an ECM on a model T Ford, but it won't run any better or use anything that the ECM has to offer.
As Spock has said, "A difference that makes no difference, is no difference."
And I would rather have 30 extra watts and not need them, than need them and not have them.
Point being: If the prices were the same, I would go with the Seasonic.
As always, These are my opinions, and YMMV.

Historically, there are more bad Corsair PSUs than bad Seasonic, so to a certain extent, brand IS important

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Therefore every Corsair is inferior to any Seasonic PSU? That doesn't make sense.
Both Corsair and Seasonic have sold low-end power supplies to appeal to a different market.
That doesn't mean Corsair or Seasonic aren't capable of selling higher quality power supplies.

Admittedly, the Corsair is a more modern design, but I submit that the build in question is NOT.

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If the S12ii design was considered out-dated in 2011, and OP's CPU + GPU were released at 2013 and 2017 respectively, the PSU is still fine?

Over a decade ago alot of components had moved from consuming to the minor rails to the 12V rail. This created an imbalance between the 12V and minor rails, where the group regulated design struggles.

And no matter how old the PSU is, it should have a full set of working protections.

Why make assumptions, generalisations, and opinions when professional reviews are available? The CX450 has proven to be an overall better power supply.