And along that PSU line, mine is the computer that keeps on costing. My UPS has been squawking at me of late. Now I'm gonna have to drop another bill on that. it never ends.
Interestingly, I plugged it into my Kill-a-watt for curiosity's sake, and doing absolutely nothing but showing the desktop the thing idles at ~95w. I was kind of surprised by that. Looks like I'm going to have to embrace some kind of sleep mode going forward, which I've always resisted. Just to experiment I ran Cinebench and Heaven alongside one another and cracked >600W almost immediately, causing the UPS to cut off instantly. That's not a realistic load, by any means, but it's certainly evidence of what it's capable of.
That is similar to what happened with me, my UPS wasn't able to take the full load on my new system and I had to upgrade. If I remember, the old UPS had a total capacity of just 450W and I had plugged my monitors too. It could support the system on idle but when I played games or did anything CPU intensive the UPS would scream. I then bought a CyberPower 1500VA Sine Wave UPS that supports up to 900W and now everything is just grand. I had bought mine for $150 and now it looks like even that they've hiked the price to oblivion.
This UPS has a display and you can check the wattage being drawn, I don't think I've ever seen it go over 550W with everything plugged in. I should run Cinebench and Heaven like you and see what the max draw is. Then again your CPU probably has a much higher draw and that by itself will skew the numbers higher.
As I recall you've got a pretty high end Ryzen. From what I gathered the actual power draw isn't terribly dissimilar. Intel's 11th gen was notorious for being an energy hog, but of course all things are relative.
I did a bit more testing last night, and what I found is that the CPU pulls about 220 and the GPU 250 under load, and there's another 80 in overhead idling (two water pumps, 5 fans, 5 drives, one monitor, system). Six hundred's what it can top out at, and that's under circumstances that should never really happen IRL. Games tend to rely heavily on one or the other, so while they'll both be active neither of them should be maxed out. And even then, maxed out in real life applications is very different than maxed out using synthetic benchmarks. My numbers jibed with online PSU calculators that suggest 520 watts to be about right.
My old UPS is only 350, which was fine with that Sandy Lake.
The thing that's always pissed me off is that UPSs seem to be design limited. APC is particularly bad about designed failure. I'm not an engineer, but it sure seems that the total capacity of the battery shouldn't matter when it's getting line power. A beep to let me know that it can't support the system in its current state would be sufficient. Moreover, if a battery fails you should still be able to use them as surge protectors, and often times the whole unit will brick itself once the battery is toast. I've always found them to be exemplary of the shittier aspects of capitalism.