A-Tech 4GB KIT (2 x 2GB) For HP-Compaq Business Notebook Series 2210b 2230s 2710p 8510p 8510w (Mobile Workstation) nc6310 nc6320 nc6340 nc6400 nc8430 n. SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory at
HP Compaq nc6400 review
Memory RAM Upgrade for HP Compaq Notebook nc6400 2GB DDR2 SODIMM | eBay
4GB KIT 2 x 2GB HP Compaq Business nc6320 nc6340 nc6400 nc8430 Ram Memory 5053462012147 | eBay
Removing keyboard and memory on HP Compaq nc6400 – Inside my laptop
HP Compaq NC6400 Ram Removal Upgrade - YouTube
Review HP Compaq nc6400 Notebook - NotebookCheck.net Reviews
2GB RAM Memory for Compaq HP Business Notebooks Business Notebook nc6400 Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-5300 667MHz Upgrade - Walmart.com