32GB (1*32GB) 2RX4 PC4-23400Y

Dell AA579531-RFB is a 32 GB server memory module for expanding compatible Dell systems. It is supplied as one 32 GB DIMM, so it adds this capacity as a single module.

The module uses DDR4 registered ECC memory with a 2Rx4 organization. Its rated speed is 2933 MHz (PC4-23400); the listing specifies 1.2 V and a 288-pin connection. ECC support and registered design identify it as server memory for systems that support this module type.

The listed compatible systems include Dell PowerEdge C4140, C6420, FC640, M640, R640, R740, R740xd, R840, R940 and T640. These references describe the systems associated with this exact part number.