Undervoltage Protection VS Over Temperature Protection !!

[hamada.hosny93]

Hi guys, when choosing a power supply as a part of a PC build, which property is better and mostly recommended than the other?

I'm little confused about that: most power supplies operate at 40 °C as a maximum heat expected to be produced, so we can't say its overheating at all, even if it was 70-80°C also still safe i think. so there is no need to add OTP property at all.

However, when undervoltage occurs, it will increase the current passing through cables causing them to over-heat and later this will reduce the lifetime of the power supply.

check out this review for more info
https://www.macromatic.com/blog/relays/what-is-undervoltage

I don't know if my info is correct cuz i'm a little knowledge about that but I think both are the same but just a difference in the way they operate, so which property is mostly recommended when choosing a power supply ?

 

[Rexper]

Protections in a power supply are made for fault situations.

If everything was always working perfectly, protections wouldn’t be needed. Just like a seatbelt in a car. But that’s not how life works.

For example, Over Temperature Protection could be triggered by the PSU fan dying, or an extreme environment (perhaps no airflow in the case, with high ambients and power hungry workload). Power supplies don’t like heat, it causes loose voltage delivery, shorter lifespan, less power delivery, higher risk of failing.

Under Voltage Protection triggers when the rails voltages dip too far. This protection is usually isn’t configured properly in power supplies (trigger is too low). The ATX specifications do not mention UVP, though OTP is required: https://www.intel.com/content/dam/www/public/us/en/documents/design-guides/resellers-power-supply-design-guide-changes.pdf#page26

A power supply should have both protections properly configured. IMO OTP is more important.

A guide to PSU protections and everything else PSU related. https://www.tomshardware.com/reviews/power-supplies-101,4193-21.html