Kahlon Memory Whats The Difference Between Standard Memory And Memory Upgrade?

Whats the difference between standard memory and memory upgrade? - kahlon memory

I see WWW.KAHLON.COM memory upgrade and the standard memory with things DDI.

My model has a RAM-128. What do I need to see

BTW, my model has 2 slots and you can have is 512 The first area 128 of the memory is removable. So I can buy two 256 MB RAM and replace the first place, right?