Memory chip types are the general same as those available for PC Desktop system; however the physical form factor(height and shape) are NOT the same (you cannot use Desktop memory in a laptop.)It is best if you consult the laptop manufacturer to make sure you are purchasing the correct chip to use in any given laptop.
depending on the laptop, it could be DDR, DDR2 or DDR3. But the form factor is all the same. Its all SO-DIMM memory
Personal Computer Memory Card International Association In computing, PC card (originally PCMCIA card) is the form factor of a peripheral interface designed for laptop computers. It was originally for memory expansion, but the existence of a usable general standard for notebook peripherals led to all manner of devices being made available in this form. Typical devices include network cards, modems and hard disks.
The Grid Compass created the form factor for all modern laptops.
picoBTX
Memory called RDRAM that conforms to the RIMM form factor.
Linksys offers an excellent PCI form factor which is great for excellent sound and great images on the laptop
A form factor houses the internal of a computer: processor, memory, power supply, etc. It is the shell of the inners. The term small form factor PC relates to the chassis of a computer in a very small form.
LPX form factor has no expansion slots but one slot in the middle of the board that allows it to host a bus riser card.The NLX has the same thing, however the expansion slot is at the end of the board. Also the NLX is standardized, unlike the LPX.
In theory it can be used but it will be expensive for you since you need to find the right case. Not every case can hold a laptop motherboard for you because of the form factor.
A motherboard form factor\ determines the size of the board and its features that make it compatible with power supplies cases processors and expansion cards. Beginning with the Intel i800 series of chipsets a hub.
I found an answer that says the expansion slots are farther away from the CPU, but can't find in which form factor this is....