Acer Aspire V3-772G - Manual (Page 30)

30 - Your Acer notebook tour
quad-core using only two memory modules and for dual-core
computers, use the lower slot in each bank.
Visit www.acer.com to find your specific model and refer to the
detailed specifications to determine which processor your computer
uses. If you’re unsure, please contact an authorized Acer service
center.