32GB single stick RAM for Blades. Same manufacturer and clock speed (3200mhz) as the stock RB RAM. Only this RAM doesn't require XMP to achieve 3200 mhz. CL22. 2x for 64GB. :
Kingston ValueRAM 32GB (1 x 32GB) DDR4 2400 RAM (Server Memory) ECC Reg Micron A DIMM (288-Pin) KVR24R17D4/32MA - Newegg.com