 "Transcend - DDR2 2 GB DIMM 240-pin" " Transcend 240-pin TS256MLQ64V8U System Memory (RAM) CDW.com
"The TS256MLQ64V8U is a 256M x 64bits DDR2-800 Unbuffered DIMM. The TS256MLQ64V8U consists of 16pcs 128Mx8bits DDR2 SDRAMs in 68 ball FBGA packages and a 2048 bits serial EEPROM on a 240-pin printed circuit board. The TS256MLQ64V8U is a Dual In-Line Memory Module and is intended for mounting into 240-pin edge connector sockets.Synchronous design allows precise cycle control with the use of system clock. Data I/O transactions are possible on both edges of DQS. Range of operation frequencies, programmable latencies allow the same device to be useful for a variety of high bandwidth, high performance memory system applications." 
 "Crucial - DDR3L 4 GB DIMM 240-pin" " Crucial 240-pin CT51264BD160BJ System Memory (RAM) CDW.com
"Enhance your laptop's performance holistically with the Crucial System Memory. Ensure lag-free functioning and efficient multitasking by upgrading you system with this 4 GB DDR3 SDRAM. With Non-ECC parity and a CAS latency of CL11, it reduces delay and enables quick loading of programs. It is compatible with motherboards having 240-pin DIMM slots and DDR3-enabled chipset. Working at a supply voltage of 1.35 volts, this unbuffered system memory delivers an energy efficient performance.4 GB RAM for PC to improving your system functionalityHigh data transfer rate with a memory speed of 1600 MHz" 