If wishes were drivers...
we wouldn't hafta surf the 'net in 16 #^@*!$ colors!
The cell color indicates the highest resolution possible for given color depth and available RAM.
The data in this table pertains only to 2-D graphics; displaying images, surfing the 'net, &c. Windows (and other GUI OSs?) will use far more video RAM while multi-tasking.
IIRC, having five open windows will crash a W3.1 system which has a 512KB vid card installed:-( The smallest RAMs once saw good service displaying text or wire-frame models.
1600x1200
1280x1024
1024x768
800x600
640x480
512x384
K=x1024
M=x1048576
VIDEO
RAM
COLOR DEPTH  in bits  (in colors)
  1
(2) 		2
(4) 		3
(8) 		4
16 		5
(32) 		6
(64) 		7
(128) 		8
(256) 		9
(512) 		10
(1K) 		11
(2K) 		12
(4K) 		13
(8K) 		14
(16K) 		15
(32K) 		16
(64K) 		17
(128K) 		18
(256K) 		19
(512K) 		20
(1M) 		21
(2M) 		22
(4M) 		23
(8M) 		24
(16M)
2MB
1MB
512KB  
256KB  
128KB  
64KB