How Laptop Memory Differs from Desktops
Every computer uses RAM, but not all computers use the same RAM. This is particularly obvious when it comes to laptops, which use physically different packaging for the same type of memory than desktops.
Whats the Difference Between Modules?
Where desktop RAM comes in Dual Inline Memory Modules, or DIMMs, laptop memory comes in Small Outline Dual Inline Memory Modules or SO-DIMMs. While electrically similar, they not only do not fit in in the same slots, but also come with a different pin arrangement:
- Laptops: Notebook RAM comes in a 67-millimeter-long package called a SO-DIMM. For DDR3, this package uses a 204-pin interface. Most contain non-ECC memory.
- Desktops: Desktop RAM comes in a much larger 133-millimeter package with 240 pins instead of 204. One reason for the higher pin count is that server memory comes in the same package as desktop memory and it requires additional features that are not the same in laptops.
How Do You Choose Notebook RAM?
Even after you have settled on the form factor, there are several different things to consider when looking for PC3 memory to put in a laptop.
- DDR3 vs DDR3L: Standard DDR3 SDRAM requires 1.5 Volts for operation, where DDR3L uses lower voltage chips that only require 1.35 Volts. While the modules themselves are compatible with dual-voltage operation, fourth generation and later Core processors only supply the lower voltage, so they cannot operate with regular DDR3.
- Speed: Kingston PC3 10600 memory provides 10.6 GB/sec of bandwidth and runs at 1333 MHz. Most DDR3 ranges between a low speed of 800 MHz for PC3-6400, to a high speed of 1866 MHz for PC3-14900. Most systems use either 1333 MHz or 1600 MHz modules, leaving the very fastest for gaming enthusiasts and overclockers.
- Kits: Many computers come with dual-channel memory interfaces, so if you need 8 GB of DDR3, you actually want an 8 GB kit with two 4 GB DDR3 modules in the package, one for each channel. You only want to install one stick of DDR3 SDRAM in a single-channel application.
Upgrading Notebooks
In comparison to desktops, notebooks are harder to upgrade. They have fewer user serviceable, and even user-accessible components. In most cases you cannot upgrade the CPU or the graphics adapter. Two things you can often upgrade are the RAM and the hard drive. Its usually a good idea to go with a recognizable brand name like Kingston for RAM so that you know that the product actually meets the official specifications for performance and stability. The more you depend on your notebook computer the more important it is that your components perform reliably, whether that be 1333 MHz RAM or a 512 GB SSD.
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