 "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" 
 "Corsair Vengeance 8Gb (2x4Gb) DDR3 1600MHz Cas9 SO-DIMM Kit" Kit | CMSX8GX3M2A1600C9"
"Corsair Vengeance 8Gb (2x4Gb) DDR3 1600MHz Cas9 SO-DIMM Kit" 
 Item Code : MEC-S3-8GDV169 Item : Corsair Vengeance 8Gb (2x4Gb) DDR3 1600MHz Cas9 SO-DIMM Kit Brand : Corsair Model : CMSX8GX3M2A1600C9 EAN : 8435910166812 Size : 8Gb (2x4Gb) Bus Speed : 1600MHz CAS Latency : 9-9-9-24 Number of Pins : 204 Other : Vengeance PCB Weight (kg) : 2.00 Price : £58.38