OFFTEK 4GB Replacement Memory RAM Upgrade for Asus S400CA (DDR3-12800) Laptop Memory at Amazon.com
Asus: Asus S400C(Touch Screen)
Installing RAM on Asus VivoBook S400CA - YouTube
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ASUS VivoBook S400C RAM Replacement/Upgrade - iFixit Repair Guide
S400CA REV.2.1 For ASUS S400 S400CA S400C Laptop Motherboard With Pentrum I3-3217U I5-3317U I7-3517U 4GB RAM HM76 - AliExpress
S400CA MAIN BOARD For Asus S400C S500C S500CA S400CA Laptop Motherboard With i3-3217U i5-3317U i7-3517U CPU 4GB-RAM 100% Working
ASUS VivoBook S400C RAM Replacement/Upgrade - iFixit Repair Guide