Best for what?... 512 is faster then 256.
The best known speed of Streamyx is 4 mbps (512 KBps)
One half of 512 is 256.
256
256 over 512 is 1 over 2, or a half.
The pattern between 512 and 256 is that each number is a power of 2, specifically, 512 is (2^9) and 256 is (2^8). The relationship can be described as halving the previous number: (512 \div 2 = 256). This indicates a consistent pattern of division by 2.
Resulation means pixel per inch either row side or column side, so row side= 512/2=256 or column side 512/2=256.
2
910/512 = 455/256
Yes 256 x 2 = 512
256
512
512/4 = 256/2 = 128