Here's what I found out for you. The DDR3 has 240 pins just like the DDR2, however, they will not be compatible, you will not be able to put a DDR3 into a DDR2 slot. The knotch on the stick of RAM is in a different location so it will not fit. So a new motherboard made for DDR3 will have to be used. They are currently out on the MAC Lite computers but not sure if Microsoft has any on the market yet. The DDR3 will use 1.5V, which is lower than the DDR2 1.8V.
A SO-DIMM (Small Outline Dual In-Line Memory Module) typically has either 72 pins or 200 pins, depending on the type of memory it supports. The 72-pin SO-DIMM is used for older SDRAM, while the 200-pin variant is used for DDR, DDR2, DDR3, and DDR4 memory types. The pin count is crucial for compatibility with specific motherboards and devices.
2.66" 200-pin SO-DIMM contains DDR2 SDRAM. One notch is near the side of the module.
DDR2 and DDR3 are both 240 pin DIMM. They have a special notch so as to keep you from putting one where the other belongs.
Computer uses Memory installed on DIMM Slots on Motherboards.Nowadays different versions of DDR RAMs are used (DDR1, DDR2 & DDR3).Laptops use similar memories (DDR1, DDR2 & DDR3) but in small form of DIMM Sockets called Small Outline Dual Inline Memory Modules (SO-DIMM) memories.
ddr1 184 pins ddr2 240 pins ddr3 240 pins there are 240 pins one side 120 pins and other side 120 pins so 120+120 = 240 pins in ddr2 ram. as well as ddr3 has 240 pins and ddr1 has 184 pins only . by Prem verma from www.prem-verma.blogspot.com
DDR, DDR2, SDR, DDR3, DDR4. SO-dimm are for laptops
Variants of DIMM slots support DDR, DDR2 and DDR3 RAM. The most common types of DIMMs are: 72-pin SO-DIMM (not the same as a 72-pin SIMM), used for FPM DRAM and EDO DRAM. 100-pin DIMM, used for printer SDRAM.
Variants of DIMM slots support DDR, DDR2 and DDR3 RAM. The most common types of DIMMs are: 72-pin SO-DIMM (not the same as a 72-pin SIMM), used for FPM DRAM and EDO DRAM. 100-pin DIMM, used for printer SDRAM.
The pins on each side are separated straight down the center. So logically the pins operate independently on processes and are 2X faster because of this. DIMM (Dual Inline Memory Module)
SO-DIMM (Small Outline Dual In-Line Memory Module) and MicroDIMM (Micro Dual In-Line Memory Module) are both smaller versions of DIMM memory modules used in laptops and small form factor devices. The main difference is their physical size and pin configuration, with MicroDIMM being smaller and having fewer pins compared to SO-DIMM. Additionally, MicroDIMM is less commonly used and has limited compatibility compared to SO-DIMM.
depending on the laptop, it could be DDR, DDR2 or DDR3. But the form factor is all the same. Its all SO-DIMM memory