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There are basically two types of RAM sticks available, out of these most common is the DDR RAM. Depending on how old your computer is you can tell what RAM stick it has. However you cannot accidentally put a different RAM stick in a slot not meant for it as it would not fit. The two main types of RAMs are SD RAM and DDR RAM. RAM sticks can be easily identified just by looking at them here’s how you can tell the difference
SD RAM:-
SD stands for Synchronous DRAM, this is an older type of RAM. New systems now come with a DDR RAM. An SD RAM is really easy to identify as it has two notches at the bottom and would only fit into an SD RAM slot.
DDR RAM:-
All new PCs are shipped with a double data SD RAM i.e. DDR RAM. Right now there are three standards of DDR Ram available in the market DDR 1, DDR 2 and DDR 3. The fourth generation of DDR RAM is touted to hit the market somewhere in 2012. To identify a DDR RAM all you have to do is to look for single notch at the bottom of the RAM stick, if your stick has it then it’s a DDR RAM. However identifying between the three DDRs can be a bit tricky. A DDR 1 RAM stick has rectangular chips where as a DDR 2 RAM has a square chip. The notch position on both these RAMs is slightly off from each other, but it’s kind of hard to tell by just looking at the notch. A DDR 2 notch is slightly towards the left from the notch positioned on the DDR 1. DDR 2 and DDR 3 can be easily identified as its notch is on the extreme left when compared with the DDR 1 and DDR 2.