Each computer contains two important components---a Central Processing Unit (CPU) and memory chips. The CPU and memory chips work together to process computations within your computer. You can't have one without the other. Your computer has a base amount of memory installed, 512 Megabytes or higher, that can be expanded to beyond 1 Gigabyte, in most cases. Before you upgrade your computer's memory, you need to know what type of RAM your computer takes: SDRAM (Synchronous DRAM), Rambus DRAM (RDRAM), DDR (Double Data Rate SDRAM) or other type.
Open your computer's Internet browser by clicking on the program's icon on your computer's "Desktop," this applies to both Windows and Mac platforms. Enter www.crucial.com/systemscanner/index.aspx in the URL box at the top of your browser's screen. The "Crucial System Scanner" tool application website will open. Click on the check box next to the wording "By selecting this box and clicking the download the scanner button, I agree to the Terms and Conditions." Click on "Download the Scanner." The "Opening CrucialScan.exe" dialog box will open. Click "Open" or "Run" to download and set up the program directly. Click "Save" or "Save As" to save the program's setup file on your computer if you don't see the "Open" or "Run" option or you are using dial-up or a slow Internet connection. The program will download and setup on your computer if you selected the "Open" or "Run" option. Navigate to the directory where you want to save the file, if you selected the "Save" or "Save As" option. Select the "Desktop" if you have a hard time locating downloaded files on your system. Double click on the "CrucialScan.exe" icon to open the program, if you selected the "Save" or "Save As" option. Click "Run" when prompted with the "Open File -- Security Warning." The "CrucialScan.exe" program will run and appear in your computer's Internet browser. Scroll to the second section on the "Memory upgrades from Crucial.com -- Determine My Memory Needs" website. The section is labeled "Your XXXXX Specifications." The "XXXXX"s represent your computer's brand and model. Locate the wording "Each memory slot can hold..." Write down the this sentence on a piece of paper---this is the type of RAM your computer accepts. Click "File," "Print," "OK" to print this website, if you have a printer attached to your computer.
If you're not sure if a module is right for your system, use the Crucial Memory Advisor tool for a list of guaranteed compatible modules.
first you will need to select the manufacturer from a drop down list then select your product line from a drop down list then select the model then click find it will take you directly to compatible ram also you will have an option to scan your system you should always ask for a guarantee on the compatibility before making any purchase and try to buy for working pairs if possible Hope this helps.