memory upgrade is typically the easiest and least expensive way to boost your computer's performance. While any time is good to add more memory, there are some scenarios in which adding a memory upgrade makes great sense and can dramatically improve your computer's performance:

You've upgraded your operating system (OS). You've installed memory-intensive software like photo-editing or a 3-D video game.
You work with large files or with three or more programmes at a time. You've added hardware, such as a new processor or a video card. You've purchased a new computer that came with too little system memory.

Laptop DDR 512MB PC3200 Memory Module

Description : 512MB 400MHz DDR Non-ECC CL3 (3-3-3) SODIMM

Detailed Specifications : Standard 64M X 64 Non-ECC 400MHz 200-pin Unbuffered SODIMM (SDRAM-DDR, 2.6V, CL3, Gold)

The components on this module include eight 32M x 16-bit (8M x 16-bit x 4 Bank) DDR400 SDRAM in TSOP packages. This 200-pin SODIMM uses gold contact fingers and requires +2.6V. The electrical and mechanical specifications are as follows :

Features :
Clock Cycle Time (tCK) CL=3 : 6ns (min.) / 12ns (max.)

Row Cycle Time (tRC) : 60ns (min.)

Refresh row cycle time (tRFC) : 72ns (min.)

Row Active Time (tRAS) : 42ns (min.) / 70,000ns (max.)

Single Power Supply of : +2.6V (+/- .1V)

Power (IDD0) : 3.615 W (operating)

Operating Temperature : 0o C to 70 C

Storage Temperature : -55o C to +150 C

UL Rating : 94 V - 0