 "Crucial - DDR3 8 GB DIMM 240-pin" " Crucial 240-pin CT102464BD186D System Memory (RAM) CDW.com
"Expand the memory of your laptop with the Crucial System Memory. Ensure lag-free functioning and efficient multitasking by upgrading you system with this 8 GB DDR3 SDRAM. With Non-ECC parity and a CAS latency of CL13, it reduces delay and enables quick loading of programs. It is compatible with motherboards having DIMM 240-pin slots and DDR3-enabled chipset. Working at a supply voltage of 1.35 volts, this unbuffered system memory delivers an energy-efficient performance.8 GB RAM for PC to improving your system functionalityHigh data transfer rate with a memory speed of 1866 MHz" 
 "Crucial 8GB (1x8GB) DDR4 PC4-17000 2133MHz Single Module "@en 1x8GB | CT8G4DFS8213 Novatech"@en
"DDR4, 2133MHz, CL15, 1.2v, Lifetime Warranty"@en 
 Memory Type DDR4 (PC4-17000) Capacity 8GB (1 x 8GB) Tested Speed 2133 MHz Tested Latency 15-15-15 Tested Voltage 1.20v Registered / Unbuffered Unbuffered Error Checking Non-ECC Memory Features N/A