Check the listing for details. MEM2811-512D= 512MB Memory Cisco 2811 Router DRAM. Condition: New. Listed at 12.99 USD. MEM2811-512D= 512MB Cisco Router DRAM Real ECC memory. Not the cheap and unreliable non-ecc memory. Also known as MEM2811-512D, MEM2811-256U768D Compatible with Cisco Router 2811. Third Party Equivalent. Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Warranty: Lifetime Replacement Warranty. Support: Email us through eBay Premium Quality: Brand name parts only-no unknown and overclocked parts. All memory modules made from major brand memory chips such as Micron, Samsung, Elpida, Hynix, Promos, Infineon/Qimonda. We do not use generic or OEM chips that are unreliable. Compatibility: Industry standard memory. Guaranteed 100% compatible. Experience: Memory expert since 1990. Exchanges and Returns: No hassle exchanges and refunds. Shipping: Quick shipping. Shipped in well padded envelope or box with antistatic packing.