Old PSU broke, need a new one

So I have an old machine (Dell T3400) and the original factory power supply just died. I figured there was no sense in fixing it so I was going to get a new one. I checked the manufacturers spreadsheet and it says that a 525 watt PSU is available. Now the power supply that I have in my scope is 500 watts. So my question is, do I need 525 watts exactly or will 500 work? I really don't want to brick the system. I also apologize in advance if there is a thread already about this...

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Looks like a stock atx psu.
Measure your old psu...LxWxH.....and verify the new psu will fit.
What psu are you looking at?
Post a link.

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The psu looks fine.

Does it physically fit?

Unless you have a whopper of a machine it should work.

For most users you will end up with a bunch of extra cables.

Give some thought as to how your going to hide those or just go modular.

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