I was mentioned above and now i'm here.
Overall about PSUs
I agree with what PC Tailor said about low quality PSUs because there are bad PSUs out there. Since companies make money on sold products, many companies are willing to lie and outright cheat their customers by selling hazardous PSUs. For those companies, as long as they get your $20 for their PSU, they don't care what happens next. However, there are honest companies out there that care about the products they sell and try their hardest to give customers the best quality PSUs. Some of those few are: Seasonic, Super Flower and Flextronics. All those three are also PSU OEMs (1st grade PSU OEMs, aka best in PSU world) and they also manufacture PSUs to other brands as well (e.g entire XFX PSU lineup is made by Seasonic, or entire Corsair AXi series is made by Flextronics, or entire EVGA Supernova T2 series is made by Super Flower).
Then, there are 2nd grade PSU OEMs, who are capable of producing good quality PSUs but doesn't mind producing low quality PSUs as well. Some of them are: CWT (Channel Well Technology), FSP, Enhance, Delta Electronics, Great Wall. And there are also PSU OEMs who mainly produce low quality PSUs, some of them are: HEC/Compucase, High Power/Sirfa/Sirtec. Though, bulk of the low quality PSUs are made by no-name PSU OEMs.
You can cheap out on every other component inside the PC except PSU. Since PSU powers everything, it is the most important component inside the PC. Also, while the PSU warranty covers the PSU itself and you can RMA the blown PSU, the PSU warranty doesn't cover any other component the PSU fried.
Most people learn the hard way not to cheap out on a PSU when low quality PSU blows and takes part of the system or the whole system with it. With low quality PSUs, question isn't
if it blows up but
when it blows up. Even entire houses have been burned down because of the fire low quality PSU caused when it blowed up.
So far, you've been lucky that your PSU has kept working. But luck eventually runs out and with that firecracker powering your PC (that Chieftec unit), it can fry your entire PC when it goes sky high. At worst, it will catch fire as well, just like seen here,
youtube:
View: https://www.youtube.com/watch?v=vY27LkiEROg
About Chieftec unit
How i can say that Chieftec APB-500B8 is low quality?
Simple. All i need to do is to look at the warranty given to it by Chieftec. Warranty length alone can tell how much trust the PSU brand/OEM has in it's PSU.
For example: Corsair VS series PSUs come with 3 years of warranty. In PSU world, that is way too shot and it also reflects on the reliability of VS series PSUs since most die before the 3 years is up. Also, VS series is the cheapest/worst PSU lineup offered by Corsair.
Another example: Thermaltake Tough Power Grand series PSUs come with 7 years of warranty. That is pretty good since 7 years is nice amount of time for a PSU warranty. With that you can be pretty sure that these PSUs have been built with good components.
Last example: Seasonic PRIME series PSUs (includes all PRIME models: regular, Fanless, AirTouch, SnowSilent, Ultra), come with
12 years of warranty! Now, this is the best you can get in PSU world and you can be certain that any PRIME series PSU is built with utmost care and will contain only the best components.
Also, no other PSU OEM/brand offers so long warranty for their PSUs. With other OEMs/brands, max you can get is 10 years of warranty.
Now, let's see how much warranty Chieftec unit has;
From the spec page, i see 24 months, which is
only 2 years. That is peanuts in PSU world. Heck, that Chieftec unit barely passes the European Union laws since here (i live in EU), bare minimum of warranty must be 2 years. Without that EU law, the warranty probably would be much less.
So, think about it a bit. Best PSU money can buy comes with 12 years of warranty, regular PSU (that i'd be comfortable suggesting) comes with 7 years of warranty while what you bought has only 2 years of warranty.
Also, while you saved about $40 or so now by getting that "budget" PSU, once it blows and takes other components with it, the new MoBo and GPU alone would cost you $300 and you'd be needing to buy new PSU as well. However, if it does catch fire, you're looking to loose far more than just your PC. PCs can be bought again, homes can be rebuilt but no-one can take back lost lives. That's why we talk about getting a good quality PSU while avoiding cheap PSUs.
Conclusion
My suggestion for you is to go and buy a new, good quality PSU. With Core i3 and RX 570, any Seasonic unit in 500W range will do just fine, e.g: Focus 550, Focus+ 550, PRIME Snowsilent 550 or PRIME Ultra 550 Platinum
pcpp:
https://pcpartpicker.com/products/compare/bkp323,KmgzK8,XndxFT,dstQzy/
Warranty wise:
Focus: 7 years
Focus+: 10 years
PRIME: 12 years (includes all PRIME models: regular, Fanless, AirTouch, SnowSilent, Ultra)
All my 3 PCs: Skylake, Haswell and AMD are also powered by Seasonic. Full specs with pics in my sig.
Like it or not, if you want your PC to work for years to come without any risk of fire and/or damage to your components, you need to hand out some money for good quality PSU. I'm not talking that you need to go with the best PSU money can buy, e.g Seasonic PRIME 650 (80+ Titanium), which costs $150+ (and which also powers my Skylake build). Seasonic Focus 550 i linked above costs $73 and is more than enough for your PC, both wattage and build quality wise.
However, if you keep using your "budget" Chieftec PSU, please, do record a video when your cheap PSU blows up since i like to see some good fireworks. Just like seen in here,
youtube:
View: https://www.youtube.com/watch?v=f6snWfd1v7M
If you still think "budget" PSU is best for your PC, i'll be waiting a video from you with good fireworks. Also, do buy a fire extinguisher, just in case.
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