Using YCbCr444 is more gpu and memory usage?

Hello.
Thanks for reading my topic.
I see in Linux the Nvidia X Server Settings the option to change color space from RGB to YCbCr444.
However selecting YCbCr444 use more energy power ? gpu and memory usage are more high ? Have any problems if selecting it ? Have any change in as the gpu works selecting it ?
That setting show if using only HDMI connection or because the monitor allow YCbCr444 ?
Sending YCbCr444 signal force the monitor processor to convert to other signal or not is done any convertions ?
Have an nice week.