|You are reading too much.|
In most instances you would not notice an appreciable difference in the speed of those two drives. A lot of it depends on what you are doing on the computer.
Do you feel there is a problem with performance with your computer as a whole? Don't read numbers. They need to be put in perspective.
Making a smaller primary partition will speed up access times. The buffer size only matters if it is too small. Doesn't help if larger than needed.
If you really want to speed up things buy a solid state drive for your OS. Very fast and very pricey.