DDR2 RAM has, to a great extent, replaced DDR RAM, the popularity owing to superior performance and lower power consumption. Something same SD RAM being replaced by DDR RAM earlier. DDR 2 RAM and even the latest DDR3 RAM are the latest hot technologies in RAM market, so it becomes very important to know what the requirement is.

Another important thing is that how many DIMM slots are there on the motherboard. Usually 4 DIMM slots are common across high-end motherboards, but some ofthem can have up to 6 too. Keeping this in mind is very important because this factor enables motherboards to have more expandability option in terms of total RAM. Some motherboards also have an option of supporting different RAM modules, ie ddrl and ddr2 alongside, so such motherboards can also help you reduce the cost if you are upgrading your computer.