Question Suspiciously slow PSU fan

[ScreperisLT]

Hello. A few days ago I have gotten a bargain on a used electronics website. I bought 6 Corsair PSU's ( Each 17Eur, whereas everywhere else they cost 30-40Eur ). I have just done testing them all and all of them work perfectly, except one. The Corsair CX600M. The fan seems a little too slow. Is it normal or should I return this PSU? Maybe it's some kind of ,,Low temperature - low rpm" mode? I will attach a video. I see it the exact same way as it is seen in the video. By the way, I have noticed that it does ramp up for a split second and only then it slows down. Also, I cannot feel any airflow moving at all.

PSU is in this photo -

https://imgur.com/tPXqV6t

View: https://imgur.com/tPXqV6t


Video of the PSU's slow fan -

https://imgur.com/1mV3oZd

View: https://imgur.com/1mV3oZd

 

[--SID--]

What do you expect from a 12 year old PSU? It's old and worn out after all those years includes the fan.

I have just done testing them all and all of them work perfectly, except one.

You've measured the ripple too?

 

[ScreperisLT]

What do you expect from a 12 year old PSU? It's old and worn out after all those years includes the fan.


You've measured the ripple too?

What is that and how do I measure it? I'm not very good with electricity. All I did was connect them to a motherboard and plugged them in. I tested each one for about 5 minutes to see if they are not completely broken and don't explode, but I will still do a longer and more stressful test later.

So it's not normal for the fan to do this?

 

[RAIDGoblin]

What is that and how do I measure it? I'm not very good with electricity. All I did was connect them to a motherboard and plugged them in. I tested each one for about 5 minutes to see if they are not completely broken and don't explode, but I will still do a longer and more stressful test later.

So it's not normal for the fan to do this?

ripple is when you have instability in the power rails, if you plotted a graph of voltage against time is it perfectly flat (no ripple) or a bit wavy (ripple). Look it up on YouTube, there's plenty of video's of the comparison between new and worn out PSU's. To measure ripple you need an oscilloscope, that's something that's probably too expensive to justify buying in this situation. Old PSU's are not as stable because component wear etc...

At my work the systems guy put's the old PSU's from the CAD engineers PC's in the low end office PC's, because it just doesn't matter for something that's only running excel and power-point all day. So I guess if these PSU's are OK for your use, depends on what your use is

as for the fan, some PSU's have a reduced/no fan mode when they're at low load to reduce noise, look up the specs for that PSU and see if it has that, the fan can spin full speed because it spins up when you switch it on so it might be a controller malfunction, or just that it's not being run at high enough load to bring the fan up to full speed

[edit] just a word of advice, don't put these in expensive systems, or better not to use them at all, because it's different when you know the history of something, for all you know these could have been maxed out in a mining rig 24/7 for the past 12 years, but it's your risk

 

[ScreperisLT]

I'll return it. Better safe than sorry. Thanks. 👍

 

[RAIDGoblin]

no worries