More like ~50W or so. Unless your UPS battery isn't fully charged. Then, UPS battery charger will also kick in to charge the battery.
Without knowing the exact UPS make and model, it is impossible to tell how much the UPS charger consumes power.
But with PC PSUs, and if you have 760W PSU (which is very strange max capacity PSU), the initial power-on of the PC consumes ~50W, if even that.
PSU doesn't provide the full 760W to PC components at all times. Instead, PC components (CPU, MoBo, RAM, GPU, SSD/HDD) ask from PSU how much they need. And PSU then delivers that to the components.
Let's say PC components ask 200W from PSU. PSU then delivers that to the PC components. But since none of the PSUs are 100% efficient, PSU will pull more watts from UPS.
Now, let's say your PSU is 80+ Bronze efficiency (which it most likely is). If so, 80+ Bronze PSU is 82% efficient on 20% load, 85% efficient on 50% load and 82% efficient on 100% load.
200W load on 760W PSU is 26% load, with efficiency rating of ~82% (maybe 82.5%). But for simplicity sake, let's say 82% efficient.
So, while providing 200W to components and due to the 82% efficiency, PSU pulls from the UPS 236W. The excess 36W is wasted as excess heat by the PSU.
Now, if you'd have 80+ Titanium PSU, which is most efficient, things would be different.
I'll take my own PSU as 2nd example. I have Seasonic PRIME TX-650 80+ Titanium PSU [SSR-650TD].
80+ Titanium PSU is 94% efficient on 20% load, 96% efficient on 50% load and 94% efficient on 100% load.
200W load on my 650W PSU would be 31% load, with efficiency of ~95%.
With this, my PSU would deliver 200W to my components while pulling 210W from my UPS. Wasting only 10W as excess heat.
My PC, currently (while i'm typing this), is pulling 78-85W from my UPS.
And the UPS i have, is: CyberPower CP1300EPFCLCD (1300VA/780W, true/pure sine wave, line-interactive),
specs:
https://www.cyberpower.com/hk/en/product/sku/CP1300EPFCLCD
Now, my UPS specs doesn't specify the UPS'es own power draw, but if to broadly calculate the charge time (8h) and wattage amount (780W), then when UPS battery is charging, it ~ consumes 97.5W per hour. Of course, battery charging isn't linear but for simplicity sake, let's say it is so.
On normal operation my UPS may consume ~5W if even that. The LCD display it has, isn't lit all the times, only when i activate it or there is some issue with main power.
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