PROBLEM: I have read your article on RAM memory. However, I would still like some more info, if you do not mind? If you take a look at my attached photo, can you please tell which part of the two long numbers I should be taking into consideration when looking to add RAM – not replace RAM? I understand that for everything to run smoothly it is vital that the two modules match. I would like to buy one to match my existing one, rather than buy a pair, replacing the one already installed.
ANSWER: This is the part number on the laptop SODIMM module shown above – HMT351S6BFR8C-H9.
Enter it in a search engine and you’ll be able to find plenty of suppliers. I saw some available on eBay. Just remember that you need a 64-bit version of Windows Vista / 7 / 8.1 in order to be able to use more than 4GB. A 32-bit version of Windows cannot use more than 4GB. If you don’t know, enter the following search query into a search engine: 32 bit or 64 bit windows – adding your version of Windows.
You only need matching modules if you want to run the memory in dual-channel mode, which is slightly faster. If you visit crucial.com and search for your model of laptop, using the Memory Advisor will tell you which capacities of memory modules can be used on it.
Matching Modules for Dual-Channel –