4GB Asus X54L-SX021V (90N7BY138N1223VL55D) RAM Upgrade
Specs ASUS X54L-SX012V notebook i3-2310M 39.6 cm (15.6") Intel® Core™ i3 4 GB DDR3-SDRAM 640 GB Intel® HD Graphics 3000 Windows 7 Home Premium Black ( X54L-SX012V)
OFFTEK 4GB Replacement Memory RAM Upgrade for Asus X54L (DDR3-12800) Laptop Memory at Amazon.com
K54L motherboard For Asus K54L X54L K54LY X54H mainboard PGA989 HM65 WITH USB3.0 | eBay
Asus X54C HDD, RAM Memory Replacement - iFixit Repair Guide
Specs ASUS X54L-SX012V notebook i3-2310M 39.6 cm (15.6") Intel® Core™ i3 4 GB DDR3-SDRAM 640 GB Intel® HD Graphics 3000 Windows 7 Home Premium Black ( X54L-SX012V)