Dell H28RR Poweredge R640 V5 System Board with iDrac Enterprise The Dell H28RR is a system board, also known as a motherboard, for the Dell PowerEdge R640 server. The PowerEdge R640 is a 1U rack server designed for dense scale-out data center computing, balancing density, performance, and scalability. The system board is the main printed circuit board in the server, allowing communication between the various electronic components. Key Features of the Dell H28RR System Board (for PowerEdge R640): Dual Processor Sockets: Supports up to two Intel Xeon Scalable processors (both 1st and 2nd Generation). The socket type is FCLGA3647. Memory: 24 DDR4 DIMM slots. Supports RDIMM and LRDIMM memory modules. Maximum memory speed supported can be up to 2933 MT/s depending on the CPU and memory configuration (up to 2666 MT/s with 2 DIMMs per channel). Maximum memory capacity is up to 3TB using RDIMM or LRDIMM. Supports up to 12 NVDIMM (Non-Volatile Dual In-line Memory Modules) with a maximum capacity of 192GB. Supports up to 12 Intel Optane Persistent Memory (PMem) modules, with a maximum of 6.14TB (or 7.68TB combined with LRDIMM). Warranty: 60day