I want to update my 4GB RAM into 8GB. Is it possible?If I do so will warranty get void??
Please give me any suggestions
Yes, it is. You will need to replace both DIMMs with 4G each to upgrade.
will I be able to use existing RAM too along with another new 4GB RAM
There are only two sockets - and by default the 4G you have comes as 2X2. You'll want to replace both of them with 2X4 or 2X8 (the memory is designed to run in matched pairs).