How much power does this gaming pc need

[vijay_001]

Processor - i5 6400
Memory - 8 GB DDR4 RAM
Graphics - NVIDIA GTX 750 Ti
HDD - 1 TB 7200 RPM

And how much VA powered UPS would it require for smooth functioning?

 

[joex444]

GPU needs 60W, CPU needs 65W. Peak load of that puts it just around 150W factoring in the board and drive. Figure this means a 250-300W PSU.

A 600VA UPS can run 200W for ~8 min while a 900VA can run 200W for ~14 min. The 600VA can handle 300W for 3 min, and the 900VA can handle 400W for 3 min. Odds are you'll be present if the system loses power while at full load, and if you're not present then it is nearly idle. Plus these things have software to automatically shut down once the battery is drained to a certain level.

 

[BadActor]

350 to 400 watts would be more than enough if you get a decent PSU. The UPS should be a minimum of 500 VA.