Sandeep,
With all due respect

are we going to get into a flame war over memory and which is cheaper by $10.00. The memory I chose, for the money, is excellent.
I think I said "I know this is for your personal computer."
All I was trying to do was make a suggestion. 4GB or 8GB. Who cares. Maybe he doesn't feel comfortable installing RAM.
So, my suggestion would be to let him decide. Plenty of RAM is one of the benefits of a 64-bit machine.
13GB? Really? Wow.
All in good fun, but let's move on.