686 pins
240
2.66" 200-pin SO-DIMM contains DDR2 SDRAM. One notch is near the side of the module.
DIMM. Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin DDR SDRAM module (bottom). Note that the SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has only one.
There are 240 pins on DDR2 and DDR3.
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.
168 pins are used on SDRAM DIMM. 184 pins are used on DDR DIMM. There are either 30 pins or 72 pins used on SIMM. 184 pins are used on RIMM.
enough
the different notch positions keep someone from installing a DDR DIMM or DDR2 DIMM in the wrong memory slot.
10
It is not hard to install the 2GB DDR2 SO-DIMM in your Acer laptop.
Yes, the 2GB DDR2 SO-DIMM is specifically for Acer laptops.
240