The used IBM 46W0690 is a 4GB PC3-14900 DDR3-1866 ECC CL13 LP RDIMM server memory module designed for use in compatible IBM servers. This memory module is an excellent choice for upgrading server memory without having to invest in new equipment, and it has undergone a rigorous testing process to ensure that it meets IBM's quality standards.
The IBM 46W0690 memory module operates at a memory speed of 1866MHz and has a memory rank of 1Rx4. It is designed to work with servers that support registered ECC memory, which provides an extra layer of data protection and helps prevent system crashes.
This memory module is compatible with a wide range of IBM System x, BladeCenter, and Flex System servers, including but not limited to:

IBM System x3500 M4
IBM System x3530 M4
IBM System x3550 M4
IBM System x3650 M4
IBM System x3650 M4 HD
IBM BladeCenter HS23
IBM Flex System x220 Compute Node

Please note that this is not an exhaustive list of compatible servers, and it is always important to verify compatibility with your specific server model before making a purchase.
Substitute part numbers for the IBM 46W0690 include 46W0692, 46W0694, and 47J0236.