UPS

[papa]

Hi folks, this may sound silly but I wanted to know .
I have a coolemaster 1000W SMPS and I wish to run Two 8800gt cards in sli.
What should be the ideal UPS capacity to hold on for say 20-30 minutes during power outages?

 

[ithehappy]

Hey guys I didn't want to create a new thread that's why asking here, do I really need a UPS for my system? I have an inverter installed in my home for the home appliances and I am using Belkin surge protector for my PC, so back up is no problem for me, is there any other thing an UPS can do besides it's back up feature?