I have a Gazv5 Nvidia, and was wondering if i were to go on newegg and get more memory, and stick in in my laptop, what would that do to my warranty?

i believe i asked this before, but i dont remember the answer...

also, what memory type and speed do i tell newegg? http://www.newegg.com/Store/SubCateg...=Laptop-Memory

and how many open slots are there on my computer? (i ordered it with 2 gb)