The reason I don't recommend a specific PSU, is that I personally prefer to buy power supplies which costs a bit more than many people find reasonable. So I don't want to recommend something outside your budget, which wouldn't be any kind of help anayways.
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But I'll add a personal opinion, which could help explain why.
I apologize for the wall of text, I can't blame you if you don't read it.
But I'll add it anyway, because I actually think it is important, and it is something I care about.
This not meant as a lecture or a recommendation, just to explain myself, and hopefully it will also explain why I don't blame your PSU because it is a trend, but because I actually put some thought into it.
"The often repeated advice" :
I know a PSU isn't as exciting to buy as other hardware components. But the PSU is in many ways one of the most important components of all.
Most importantly, it is what keeps the system alive, but on the other hand it can also turn out to be the most destructive component of all. Many people don't really appreciate the importance of a good quality power house, and it is a shame.
Some people happily invest in an RTX2080 TI, but decide to save money on the PSU. But the PSU is the one component which has the potential to damage all components connected to it beyond repair, if it fails in a worst case scenario.
Even if a poor quality PSU never fails while in use, it often causes damage anyway, by not providing stable and sufficient power, supplying precise voltages that doesn't fluctuate constantly or excessively.
Components connected to a poor quality power supply are known fail prematurely in some cases.
"Important factors people rarely even take into consideration"
In addition, many PSUs of poor quallity lack some of the safety features found on higher quality PSUs, which are both there to protect the components in the PC, but also the electrical wiring outside the PSU thus avoid being a potential fire hazard, if things go horribly wrong.
Some people's insurances aren't even valid in a situation where a fire is caused by electrical equipment - for me personally, that is something I have to pay in addition to my insurance policy, so it is not something I make up.
Most people I know personally, has decided not to pay that additional fee, so with my personal experience in mind, the mentioned scenario is actually something I consider to be a very real and possible outcome.
"Personal reasons"
So when I buy a new PSU, I don't look only for a popular name, the factory warranty is also useful as an indication to the quality.
The PSU I have now, has a 13 year factory warranty, which tells me, that this is the manufactuers life expectancy of the components being used.
The factury naturally don't want to be replacing faulty units under warranty all the time, so interpret it as if they beleive their porduct will be safe and develop no defects for 13 years.
On the other hand, when you buy a PSU with a 3 year warranty, some even offer one year only, that indicates to me, that manufactuer don't feel they can guarantee that the PSU won't fail for longer than 3 years, or sometimes as little as one year.
So if I were to make a specific recommendation for you, which I could give with a good conscience at the same time, factoring in everything written above, I would probably recommend something a bit over the top.
I don't mind recommending PSUs, but I also don't want to provide false advice. In this case, where you are aprehensive about blaming the PSU primarely (which is not a negative thing at all, always look for a second opinion, there are many "experts" online), I think it is very important to provide good advice, so you don't feel almost "forced" by popular demand, to go out and buy a new PSU.
So being well aware that I would probably recommend something over the top, because my personal opinion plays a part in it, I think the best recomendation I can give and feel good about, is a source for solid information which is factual and not personal opinion
At the same time, I actually hope someone will see your thread and have a specific recommendation which is perfect for your specific requirements.
But a high quality PSU, can fail spectacularly as well, by the possiblity of it happening, is significantly less then with a poor quality PSU, often advertised with specs above it actual performance capabilites - altso contributing to a high failure rate.
HOWEVER, I can't say with no kind of doubt, that your PSU is faulty and is the only possible cause for the problems you are experiencing with your PC currently.
You have the computer next to you, you know all the detials which would be impossible to include in a forum thread.
So if you feel like my advice is completely off, you have a better reason for that, than I do.
But with the details you have provided in mind, I actually believe the PSU is the most likely component to be causing the stability issues, but I can definately also be wrong.
Sometimes when asking for advice, you'll be offered a variety of different suggestions and advice.
They can't all be the right ones, but one of the recommendations will often turn out to be the right solution - this is my suggestion, someone will hopefully be able to come up with different recomendations.
Personally Seasonic is one of the manufacturrers I prefer the most. Sometimes other manufacturers sell PSU under their own name, but based on a platform from someone else, so my previous PSU was a Corsair AX860, which is actually a Seasonic platform. Super Flower are also known for quality (despite the name, which sound cheap to me
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I've primarely been buiyng PSUs from Seasonic and Corsair.
Corsair RMx PSUs are regularly recommended, reasonably priced and good quality.