Upgrading Ram Specifics

Jun 2, 2014
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Hello there.

I have a VAIO VPCF11S1E.
The laptop has two ports for ram and they are filled with one 4gb samsung (M471B5273BH1-CH9) and 2 gb korean card.

I was thinking of upgrading to 8 (or 16 - but i'll have to spend the monh eating just pasta to save up).

Just wanted to ask your opinion:
Should I
a) find the same card as the Samsung to go to 8?
b) buy a new pack of 2x4 ram?
or c) Get 16

Cheers :)