Does the 32 and 16 bit displays use more resourses than 256 colors?

System specs:
Windows 98 1st ed,
750 T-bird, 900MHZ CORE, Golen orb, FSB=110, CPU=850MHZ
Asus K7M, 1009 bios
300W Topower PS
Diamond speedster 16meg A90 x2
192 meg Muskin 133mhz rev 1.5 7.5ns
Maxtor 10gig /66.