NG FMC QRH speeds are generated using basic programmed data from FMC only, it knows the runway direction, elevation and length.
But it can take into account WIND, SLOPE and DRY/WET/SKIDRESISTANT etc...
Entering it prior to entering company speeds will serve as a gross error check only.
IT WILL ALWAYS GIVE YOU BALANCED FIELD SPEEDS, as obstacle data is not available as per post by CCA.