CRUCIAL CT2KIT25664AA667 4GB ( 2GB x 2 ) 240-pin DDR2 667mhz Non-ECC 1.8V CL5 Desktop Memory Module New - Retail 1-Year Warranty Crucial CT2KIT25664AA667 CRUCIAL CT2KIT25664AA667 4GB ( 2GB x 2 ) 240-pin DDR2 667mhz Non-ECC 1.8V CL5 Desktop Memory Module