The Back-UPS NS 1080 won't work for your computer. The maximum rated power is 650W, However, I recommend that you look at Volt-Amps rather than pure power. For instance if your computer operates on 120VAC and draws 13 Amps then the minimum size UPS for your computer is 120 x 13 = 1560VA. You also need to do the same calculation for your monitor and add the two together to find out your minimum UPS requirement.