Monday 19 December 2011 at 1:54 pm.
Today there are 4 types of laptop memory, such as: SO DIMM DDR, SO DIMM DDR2, SO DIMM DDR3 and Micro DIMM.
Types listed above don’t include RAM for desktops (personal computers) that some sellers successfully sell as if it’s for laptops and some users successfully buy it. Moreover, some models of notebooks are equipped with additional memory slots that are located under a keyboard, not under a lid that is easy to open.
So that, upgrading process is getting more difficult, in addition, you may break something essential. Your notebook will not start to run with the module that is fixed askew, as well with modules that are working at high frequency of bus or that have memory more than acceptable.
Let’s start our review with RAM used in laptops that have been produced in 2002-2004:
SO DIMM SDRAM (PC-100, PC-133)
At that time there have been used old types of laptop memory, such as SO DIMM SDRAM PC100 or PC133.
Today almost no one uses that kind of laptops. The name of RAM is deciphered as following: Small Outline Dual In-line Memory Module Single Data Rate Memory.
You may see a SO DIMM SDRAM module on the picture above
SO DIMM DDR (PC-2100, PC-2700, PC-3200)
This type of RAM is being installed on laptops released in 2005-2008. Being deciphered this type of laptop memory sounds like Small Outline Dual In-line Memory Module Double Data Rate Memory.
You may see a SO DIMM DDR module of 1 GB on the picture above
This RAM operates at 266 MHz (PC2100), 333MHz (PC2700), and 400 MHz (PC3200).
You may see a “key” on the screen – 15 mm on the left side.
SO DIMM DDR2 (PC-4200, PC-5300, PC-6400)
This type of RAM is being installed on laptops produced in 2006-2008. It’s deciphered as Small Outline Dual In-line Memory Module Double Data Rate Memory 2. These types of laptop memory work at 444 МHz (PC4200), 555 МHz (PC5300), 666 МHz (PC6400). You may see the “key” on the screen – 16 mm on the left side.
You may see a SO DIMM DDR2 module on the picture above
SO DIMM DDR3 (PC-6400, PC-8500, PC-10600)
Up-to-date laptops released in 2009 use this type of RAM. Being deciphered this type of laptop memory sounds like Small Outline Dual In-line Memory Module Double Data Rate Memory 3.
It works at 800 МHz (PC6400), 1066 МHz (PC-8500), and 1333 МHz (PC-10600) frequency. There is the “key’ seen on the image (24 mm on the left).
You may see a SO DIMM DDR3 module on the picture above
Micro DIMM DDR2 (PC2-4200, PC2-5300, PC2-6400)
This type of RAM is being installed on up-to-date laptops released in 2009.
It deciphered as Micro Dual In-line Memory Module Double Data Rate Memory 2.
You may see a Micro DIMM DDR2 module on the picture above
Finally, I’ll show you an image of common RAM that is inappropriate for laptops. It is only fair to add, that there were laptops working with RAM for personal computers 5-6 years ago.
However, today such laptops are few, all the more, they have been hardly considered to be called as portable.
RAM for common personal computers (DDR3 in this case)
Being at least double in size, this RAM is 2-3 times cheaper than RAM for laptops of the same type and size.
You will be by no means able to install this RAM into your laptop or other up-to-date one.
So, don’t be mixed up!
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Used tags: ddr, dimm, laptop, laptops, memory, module, ram, type, мhz