Although these are not Compaq original modules we guarantee them to work as the Compaq Part Numbers listed. Compaq Compatible Part# 343055-B21 - 1GB PC2-3200 DDR2 ECC REGISTERED Kit (2x 512MB) $80.00 Compaq Compatible Part# 343056-B21 - 2GB DDR2 ECC REGISTERED (2x 1GB) $150.00 Compaq Compatible Part# 343057-B21 - 4GB DDR2 KIT (2x 2GB) Regular price: $280.00 Sale price: $260.00 Compaq Compatible Part# 375004-B21 - 4GB DDR2 KIT (2x2GB) Regular price: $280.00 Sale price: $260.00 Compaq Compatible Part# 404122-B21 - 8GB DDR2 KIT (2x 4GB) Regular price: $1,250.00 Sale price: $1,050.00 Compaq Compatible Part# 348106-B21 - 8GB DDR2 KIT (2x 4GB) Regular price: $1,250.00 Sale price: $1,050.00