Corsair GB (2 x 1 GB) Memory Module Kit for Select Dell XPS Desktops...
The is a 2048MByte matched pair of DDR2 SDRAM DIMMs built using Corsair's latest high performance heat sink with Dual-Path Heat Xchange (DHX) technology. This part delivers outstanding performance in the latest generation of dual-channel DDR2-based motherboards. It has been tested extensively in multiple DDR2 motherboards to ensure compatibility and performance at its rated speed. This memory has been verified to operate at 800MHz at the low latencies of 5-5-5-18.
As low as $79.99
User Review: I have a smaller form factor case though and I had to switch out a DVD drive they could both fit.