APC-500 ups is not enough for 580W psu ?

[pfcNakamura]

Hello guys,
do you know if an APC 500VA ups is not enough for a system that uses 580W psu?
When doing work in ms office or surfing internet, I have no problems, but once I start games, my ups starts beeping and "overload" led lights up. If I unplug the monitor from ups, it works normal again.
So, should I change APC500VA for 650VA or 700VA ?
I plan on adding additional video card for SLI.

My current system is:
C2D e6750
8800Ultra
one Hitachi 160Gb sataII hdd
one dvd-rw
two 120mm fans
two 80mm fans
one HUGE fan on the side of the system case (Thermaltake Armor)
LG L204WT monitor (20.1)
Hiper HPU-4M580 psu

Any help is greatly appreciated.

Thank you.

 

[SparkyJJO]

You won't be able to run on battery when running your computer under load. Sounds like it is OK at idle or near idle but that's about it. You'll want a larger UPS for sure. If you can get the 650VA or even better the 700VA that way you have room to expand some more later.

 

[pfcNakamura]

Thanks SparkyJJO,
I went and bought APC 700VA. Wanted to get 800VA with AVR but no such luck. Having limited choice = the suck !!! LOL