Product Detail 4GB KIT OF 2 ( 2 X 2GB ) DDR2 DIMM 667Mhz PC2-5400 / PC2-5300 240PIN AM2 ONLY WORKS ON MOTHERBOARDS WITH AMD PROCESSORS (SOCKET AM2 ,AM2+ AND AM3 PROCESSORS) . Non-ECC Non parity Voltage 1.8V. SUPPORTS DUAL CHANNEL TRIPLE CHANNEL AND QUAD CHANNEL Lifetime Warranty COMPATIBLE WITH Asus M3A78-CM . The "4GB 2 x 2GB DDR2 DIMM 240 PIN AM2 667Mhz PC2 5400 / PC2 5300 4 GB" is best product for you. We recommended 4GB 2 x 2GB DDR2 DIMM 240 PIN AM2 667Mhz PC2 5400 / PC2 5300 4 GB