 "Crucial 4GB (1x4GB) 2133MHz DDR4 ECC RDIMM 1.2v "@en 1x4GB | CT4G4RFS8213 Novatech"@en
"2133MHz RAM Speed, CL15, ECC, Registered, 1.2v VDIMM, Lifetime Warranty"@en 
 Memory Type DDR4 (PC4-17000) Capacity 4GB (1 x 4GB) Tested Speed 2133MHz Tested Latency CL15 Tested Voltage 1.2v Registered / Unbuffered Registered Error Checking ECC Memory Features N/A
 "MOD.RAM DDR3 1600 4GB SODIMM" SODIMM | Tradineur.com"
"Capacidad total: 4 GB; Frecuencia (Bus clock rate): 1.600 MHz; Tecnología: DDR3 tft; Kit: No; Tipología: SO-DIMM analogico; Generica: No" 