Why are cheap PSUs so cheap?

Ashish Joseph

Reputable
Mar 17, 2014
78
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4,630
The least expensive branded psus cost over Rs 2000 in our area, while the cheap ones cost only Rs 500, and everyone(atleast 99%) chooses the cheap ones. By cheap ones i mean zebronics, mercury, etc. All the shops here sell assembled pcs with these psus, and nobody cares about it, they just want it cheap. I have heard about its drawbacks like not giving as much power as specified and even as far as blowing up and taking away other components with it. Still i haven't heard of anything like that here. My pc was bought when i was young, 8 years ago. It was a pentium d pc. It had a 400W mercury psu(cheap), and experienced no problems. After a few years, i upgraded to an hd 6670 and a core 2 quad, and still the pc was fine. Recently i upgraded to an Antec VP450P psu. So the cheap one basically lasted 8 years. It wasn't damaged or anything, still works just as usual. One thing i noticed is that the pc was pretty silent after getting the new psu. And this one costed Rs 2800, which is nearly 6 times higher than the local one.
I had been doing some research about psus for some time, and everywhere on the forums it just says never buy a cheap psu for any build and these are tier 5 psus and are garbage, but still nobody in our area cares about. Recently i built a budget gaming pc for my friend, and he said that he only needed the zebronics psu which costed 6 times less, and didn't care about branded psus when i told him about them. So, why are they so cheap? Usually rival products that are like 30% cheaper is considered to be very cheap, but 6 times less is way too cheap. They may be built with cheaper and weak components, but still was ok till now(8+years and still running).
There has to be a catch right?
 
Solution
Cheaps PSUs don't have to fail or blow up to cause problems. You may find strange problems, particularly if you install a new graphics card, such as unexplained reboots or a computer just refusing to start Windows. A lot of time can be wasted trying to track down software problems that turn out in the end to be caused by an inadequate PSU.

I've learned the hard way that itls better to buy a decent PSU in the first place. You can always move it to a new PC as you upgrade. People selling computer systems will choose the cheapest components they can get away with, particularly when it comes to PSU. When things go wrong this is probably the last thing that the user thinks of; RAM gets swapped out, even motherboards and procesors when all...

zink1701

Honorable
Sep 14, 2012
1,174
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11,960
Cheap PSU's are ok until you try and push them above 80% load capacity. Once you start pushing them the tend to fail fast due to cheaper components. I have seen many times when someone upgrades a GPU or other high demand component. The new part will push the PSU to its limit and thats when issues arise. /the main difference is if something does go wrong. Most good quality PSU's have a lot of fail safes in the event of power surges and failures to protect your machine. A lot of the cheaper ones dont so if it does blow there is a good chance it damages your motherboard.
 
Cheaps PSUs don't have to fail or blow up to cause problems. You may find strange problems, particularly if you install a new graphics card, such as unexplained reboots or a computer just refusing to start Windows. A lot of time can be wasted trying to track down software problems that turn out in the end to be caused by an inadequate PSU.

I've learned the hard way that itls better to buy a decent PSU in the first place. You can always move it to a new PC as you upgrade. People selling computer systems will choose the cheapest components they can get away with, particularly when it comes to PSU. When things go wrong this is probably the last thing that the user thinks of; RAM gets swapped out, even motherboards and procesors when all along the problem is simply inadequate power.

It is true that, at worst a PSU can blow up; it can happen even with a good one. If that happens with a cheap one, without protection built in, it is likely to take out other components at the same time. But, you pay your money and you take your chances. It's certaily tempting to save a little money on the PSU, but it's not a choice that I make nowadays.

There's an advert on British TV at the moment that encapsulates the point. (I think it's for VW cars.) It shows two guys buying parachutes. The guy at the counter says "This one is a little cheaper. The stiching isn't so good, the materials are a bit cheaper, and it hasn't been tested so much, but....". The one guy buys the cheap one. The other one says "I'll take this (the expensive) one", then you see him go out and get into a VolksWagen. As with the PSUs it's a question of which parachute you would choose.
 
Solution