Question UPS beeps briefly when powering on one PC but not another

[rodmanii]

today when i turned on my computer:
Operating System
Windows 11 Pro 64-bit
CPU
AMD Ryzen 9 7900 52 °C
Raphael 5nm Technology
RAM
64.0GB Dual-Channel Unknown @ 2394MHz (40-40-40-76)
Motherboard
ASRock B650M Pro RS (AM5) 18 °C
Graphics
M27Q (2560x1440@59Hz)
4087MB NVIDIA GeForce RTX 4070 Ti SUPER (MSI) 39 °C
512MB ATI AMD Radeon Graphics (ASRock)
SLI Disabled
CrossFire Disabled
Storage
1863GB KINGSTON SNV2S2000G (SATA-2 (SSD))
1863GB KINGSTON SNV2S2000G (SATA-2 (SSD))
Optical Drives
No optical disk drives detected
Audio
NVIDIA Virtual Audio Device (Wave Extensible) (WDM)
Power Suply
XPG Core Reactor II 1000W

it didnt power on and the UPS:
a Forza SL-1011UL-D of 600W

that is connected to started beeping continously till i turned it off and then on, and then the PC powered up without pushing the power button, what could be the cause for this and it should cause to corcern?

in the past it has also ocurre that powering the PC results in the UPS beeping briefly and then resuming work as normal

i have a second PC that i use with the same UPS and the described problems dont happen with this second PC, that is a bit older and doesnt have a GPU, should this be indication of anything?

 

[BFG-9000]

After a PSU has been unplugged for awhile, when you go to switch it on there is considerable inrush current to fill the primary side capacitors. This, combined with the actual load to power the computer, may briefly exceed the 1000VA/600w capacity of your UPS and trigger overload warnings.

The UPS may be marginal for the load of the newer computer, but if it powers on fine when it has been plugged in for awhile--with perhaps only an occasional beep from the UPS you can continue to use it. Just be aware if the power goes out while you are actually using the GPU, that the runtime may be very short.

 

[rodmanii]

After a PSU has been unplugged for awhile, when you go to switch it on there is considerable inrush current to fill the primary side capacitors. This, combined with the actual load to power the computer, may briefly exceed the 1000VA/600w capacity of your UPS and trigger overload warnings.

The UPS may be marginal for the load of the newer computer, but if it powers on fine when it has been plugged in for awhile--with perhaps only an occasional beep from the UPS you can continue to use it. Just be aware if the power goes out while you are actually using the GPU, that the runtime may be very short.

is it safe to assume that an UPS of 1000W or more, wouldnt have this problem?

 

[BFG-9000]

Well sure, if you have enough UPS capacity then it could handle even the huge inrush current of large transformer powered lighting or electric motors. I plugged a 685w laser printer and my home furnace (electric motors can draw up to 2.5x the label current when starting against a load such as the fan it's attached to) into a 3000VA/2250w UPS and it works fine with those.