UPS question

[kgeissler 0]

Right now I have a 500VA UPS.

 

Here is what I need to power to in the electricity goes out:

1 - computer w/ 250W power supply

1 - computer w/ 300w power supply

1 - 19" monitor

1 - cable modem

1 - 10/100 hub

 

If I buy another 500VA UPS, would that be enough power to power everything?