Question: what is the difference between types of ram?
Answer: Let's look at DDR2 and DDR3 RAM differences first. ... DDR2 RAM uses 1.8V, while DDR3 is lower at 1.5V. Lower voltage means the RAM uses less power, thus putting less strain on the CPU. You can find sticks of DDR2 RAM that are 4GB, but the most common maximum is 2GB.