With horrible pc parts price I bought this Office PC with a Asus Prime B360M-K to upgrade as a gaming pc but the chiniese GTX 1650 Low profile I bought does not boot sometimes. It gives 1 long beep and 3 short beeps gap and another beep. card fan does spin all the time.
I would expect a (legitimate) 500W psu to still be enough, going from i3-8100 to i7-9700k is only going from 65W TDP to 95W TDP. I would recommend a better cooler than the stock intel one if you go for that, though.