2GB [2x1GB] RAM Memory Upgrade for the Dell Dimension 8400 (DDR2-400, PC2-3200) | eBay
Got these 3 dell towers the other day . All of them have Windows XP on them. The two towers are a Dimension 8300 and a Dimension 8400. Both have a Pentium
4GB Memory Upgrade for Dell Dimension 8400 Desktop PC 4 X 1GB DDR2 NON-ECC PC2-4200 240 pin 533MHz DIMM RAM (MemoryMasters) - Walmart.com