I have sony vaio pcg k45 with 512mb Ram, I am planing to upgrade my ram to 1gb, ( after I increase the ram will it effect my note book speed? and one more question I have DDR ram, with one slot, and I saw one ram DDR2 with one slot, is there any difference?

Thanks in advance.

you need the right one for your laptop

DDR2 will not work in a laptop that takes DDR and vice versa. The type, number of pins, parity and speed also matter.

Use a site called "crucial memory" (google them) to tell you what RAM your laptop needs

and yes 1gb makes a big difference

Thanx for your reply.

no problem