This 64GB memory is 100% compatible with Dell PowerEdge M640P. Information on memory configurationThe following technical specifications should be observed in advance:RDIMM and RDIMM 3DS (Registered DIMM) or LRDIMM and LRDIMM 3DS (Load Reduced DIMM) RAM memory can be installed in the device. LRDIMM memories are recommended if large memory capacities are to be achieved.RDIMM and RDIMM 3DS memory modules cannot be operated together with LRDIMM and LRDIMM 3DS main memories.If a memory expansion is to be carried out with the existing RAM memory, it must be checked which basic memory technology (RDIMM / LRDIMM) is available.When using a multiprocessor system, the memory slots should always be fitted identically for each CPU.If memory modules are offered with higher clock rates than specified by the system, the memory clock is automatically adjusted to the system specifications.The CPU supports 6 DIMMs per memory channel.maximum memory speed of the possible CPUsXeon CPUs of the 2nd generation are offered as Bronze, Silver, Gold or Platinum. The different processor series each support different maximum clock frequencies:XeonCPU seriesmax. SpeedMHzmax. memory capacity per CPUBronze320021331 TBSilver420024001 TBGold520026661 TB, 2 TB, 4.5 TBGold620026661 TB, 2 TB, 4.5 TBPlatinum820029331 TB, 2 TB, 4.5 TBPlatinum920029331.5 TB