The 4 Gb memory is non removable so will the 8 GB go over the top and give me 12 Gb?

Hello, Thank you for contacting us in regards to your question. Yes, if you remove the stock RAM with a higher capacity, you get 12 GB of memory total. Thank you, Newegg Support

Questions & Answers: CMS 8GB (1X8GB) DDR3 12800 1600MHz NON ECC SODIMM Memory Ram Upgrade Compatible with Asus/Asmobile® X Series Notebook X55Vd, X55U, X55C - A8

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CMS 8GB (1X8GB) DDR3 12800 1600MHz NON ECC SODIMM Memory Ram Upgrade Compatible with Asus/Asmobile® X Series Notebook X55Vd, X55U, X55C - A8

Computer Memory Solutions guarantees compatibility with models provided in description.
Memory Type: SODIMM, 204-Pin
Speed: DDR3-12800, 1600 MHz
1 Piece Kit
Product appearance may vary. Picture for reference only. limited lifetime warranty when bought directly from computer memory solutions

$20^.50 –