Jaguar

MB Memory 4GB is a brand DDR3L Adata hard to find (the date 10/13/2014 in France).
I found a 4GB 80 on amazon.de (not yet delivered)
I could have bought a Corsair Value Select SO-DIMM 4GB DDR3L 1600MHz CL11 45
but it is not advisable because of course possible compatibility issues.

If this computer is provided mSATA socket. So I bought on Amazon mSATA SSD
of 500GB from Samsung. I installed W7 after removing the hard drive.
No problem drivers downloaded from the MSI website.
I reinstalled hard drive in the laptop and I formatted to serve as a data disc.
Result: a computer 15.4 "which boots in 10 seconds and has a second disc.

Know that unlike Asus you lose your warranty if you open your laptop.
You are warned!