It depends on how you use it. If you are playing a mainstream online game ddr3 4G read speed should be better. If you're searching for a web page, especially one that loads images, the ddr3 4G is a great way to get the most out of your computer. The following figure is ddr2 8G memory to open 23 pages (there are 20 Taobao clothing page picture is very much) at this time the memory used to reach 4G accounted for 50% is not bad at all, the CPU is enough to open the game can also be. If you use ddr3 4G at this time to close to 100% memory use, it is more difficult. The double 11 Taobao also did not open to 20 pages, here is just to do a comparison. Memory speed, capacity, compatibility, price, cost-effective to see how to match. Enough can be used.