Understand that a ups isnt made so you can keep gaming, but so you can safeoy turn off your pc when hit by power outages or powersurges. Look at how much power draw your pc uses and work from there. You can find calculators for psus. I also personally recommend using 1 ups for 1 pc and 1 monitor. But if you insist on using the 1 ups for both pcs, but only use 1 pc at a time, calculate your ups for the pc that draws more power, and what ever pc your not using at the time disconnect. Not my main recommendation, but if you insist on using only 1 ups, thats what i would recommend. Hope that helps.