Dell X45NX Poweredge R640 System Board The Dell X45NX is a system board (motherboard) designed for the Dell PowerEdge R640 server. It's a crucial component that houses the processors, memory slots, and various controllers necessary for the server to function. Here's what you should know about the Dell X45NX system board for the PowerEdge R640: Key Features and Compatibility: Designed for Dell PowerEdge R640: This system board is specifically engineered for the 1U rack-mounted R640 server. Processor Support: It typically supports up to two Intel Xeon Scalable processors (both 1st and 2nd Generation). The specific socket type is FCLGA3647. Memory: It has 24 DDR4 DIMM slots, supporting RDIMM, LRDIMM, and potentially NVDIMM and Intel Optane Persistent Memory (PMem) depending on the specific board revision and configuration. Maximum memory capacity can be up to 3TB with RDIMM/LRDIMM. Warranty: 60day