NUOVO Crucial 4 GB kit (2 GB x 2) DDR2 800 MHz PC2-6400 CL6 RAM desktop - CT25664AA800
Model: CT25664AA800. Latency: CL6. Speed Compatibility: These are 800MHz (PC2-6400) but will automatically "downclock" to work in 667MHz (PC2-5300) or 533MHz (PC2-4200) motherboards if required. Type: 240-Pin DDR2 SDRAM.