The ST50 server supports Lenovo Tru DDR4 memory. Tru DDR4 memory uses the highest-quality components sourced from Tier 1 DRAM suppliers & only memory that meets strict requirements is selected. It is compatibility-tested & tuned to maximize performance & reliability. Feature Feature Value Internal memory 16 GBInternal memory type DDR4 Memory clock speed 2666 MHz Component for PC/server Memory form factor UDIMMBuffered memory type Unregistered (unbuffered)ECCYMemory voltage 1.2 VCompatible products Think System ST50