In this video I have explained the difference between DDR3 and DDR3L RAM. There are two types of DDR3 RAMs. The both type of RAMs are physically made up same and have the same notch position and can be fit in the slot of each other physically. The first one is DDR3 which is also referred as PC3 that works in 1ST 2ND AND 3RD generation intel laptops and operates at 1.5Volts. This RAM doesn’t work properly in 4th and 5th generation laptops and can cause blue screen errors and system instability. The second type DDR3L RAM is also referred as PC3L RAM that works in 4th and 5th generation Intel laptops and operates at 1.35Volts. The DDR3L PC3L RAM is backward compatible with DDR3 PC3 systems of 1st 2nd and 3rd generation. Therefore, you can use DDR3L RAM in all generations from 1st generation to 5th generation.