Legal
Stay connected
Compatibility tips and upgrade deals, straight to your inbox. No spam.
Guaranteed-fit promise
Every part is matched to your machine's slots and drive bays and checked against its published specs before we list it.
DDR3 · SO-DIMM · up to 1333 MT/s
Not stocked right now. It still matches your system's specs— get an email the moment it's back.
Every option here matches this system's published specifications. Muted means it fits too — we just don't stock it right now. Pick one to switch.
SATA 2.5" SSD · SATA 2.5" Hard Drive
SATA 2.5" SSD · 256 GB
Spec-matched to your systemNot stocked right now. It still matches your system's specs— get an email the moment it's back.
Every drive here matches this system's published specifications. Pick a drive type, then a capacity. Muted means it fits too — just not stocked right now.
How we know SATA 2.5" SSD fits
Software for your upgrade — matched to your ASUS X55U-AB21 laptop.
Checks the drivers on your ASUS X55U-AB21 laptop, installs the safe updates Windows offers, guides the rest to the official download — and confirms exactly which of the upgrades above your machine has room for.
Complete your upgrade. This machine takes both memory and storage — add one from each tab above to do it in one order.
ASUS X55U-AB21 laptop takes DDR3 SODIMM memory, 1 slot, up to 4 GB. Every option above matches those requirements, so it typically installs and runs without any firmware change.
“Spec match” means the module matches your system’s published specifications; it isn’t yet confirmed against a manufacturer tool.
Specifications reported for the ASUS X55U-AB21 laptop.
Good to know
Guaranteed fit
Matched to your machine's slots and drive bays before we list it — or your money back.
We've already matched the memory and storage upgrades that fit this exact machine to its published specifications — they're just not in stock at the moment. Leave your email and we'll tell you the moment any of them is available again. Guaranteed fit, no wrong parts.