YOU ARE looking ON :2X512MB (1GB in total)PC3200 400MHZ ECC DDR SDRAM (64 Meg x 72) MODULES.MANUFACTURED BY MICRON. Click the "Buy It Now" button now topay securely with any major credit card through PayPal now!Same day dispatch! Fast shipping World Wide! Please note: These are ECC-REGISTERED Ram modules and may not becompatiblewith motherboards thatdo not support ECC-REGISTERED data transfers. Datasheet is included below,please read it and ensure 100% compatibility with your motherboard. If unsure, please have your motherboard model ready and contact us to ask before placing the order.Each module is checked before shipment.Sales are final and wedo notaccept refunds or exchange.Primary InformationData Integrity CheckECC Registered(Please ensure your motherboard cansupport this feature)RAM / Memory Speed400MHzRAM / Storage Capacity512MB (X 2 modules= 1GB kit. Matching pair)RAM TechnologyDDR SDRAM PC3200ManufacturerMicronModel numberMT18VDDF6472G-40BG3TypeCL3DatasheetClick here to download full DatasheetPlease Check outour other items! Be sure to addus to your favourites list!