Upgrade for ASUS X53U SX181D

Hello All,

I have a ASUS X53U SX181D laptop.
Main configuration of the Laptop are as follow :-
Processor - AMD APU C-60 (1 Ghz)
Ram - 2GB DDR3
HDD - 320 GB
Screen - 15.6 inches

I am thinking of upgrading my laptop's Ram so wanted your opinion about the same. Basically, I am planning to upgrade my Ram to 6 GB i.e. adding another Ram stick of 4 GB DDR3 capacity but a bit confused whether or not it is worthwhile because it seems it would Bottleneck with the processor.

So, please guide me...

Upgrade for ASUS X53U SX181D