512MB PC2700 DDR-333
512MB PC2700 DDR333 Unbuffered Non-ECC
4GB DDR4-2666 Non-ECC VLP UDIMM
4GB Module - DDR4 - Non-ECC - Unbuffered - 2666MT/s - PC4-21300 - 19ns CAS Latency - 1.2V - Very Low Profile (VLP) Form Factor - Lifetime Depot Carry-In Mfg. Warranty