Visit the ASUS website (for the latest DDR 400 QVL for this motherboard. DIMM Vendor Chip Number Chip Brand SS/DS Module Part Number Size KINGSTON HY5DU56822BT-D43 Hynix SS KVR400X64C3A/256 256MB KINGSTON HY5DU56822BT-D43 Hynix DS KVR400X64C3A/512 512MB KINGSTON V58C2256804SAT5(ECC) Mosel SS KVR400X72C3A/256 256MB KINGSTON V58C2256804SAT5(ECC) Mosel DS KVR400X72C3A/512 512MB KINGSTON HYB25D256800BT-5B Infineon SS KVR400X64C3A/256 256MB KINGSTON HYB25D256809BT-5B Infineon DS KVR400X64C3A/512 512M