Computer hardware geeks enter

Brother, let me tell you this! ~

Answer 1 question: DDR2 memory has a transfer rate of 800. Your motherboard supports it. You can plug in 1G or more but only up to 4G. But your CPU will lower the transfer rate of your memory. This is called underclocking. It will be equal to the CPU frequency. Even if the transmission rate supported by your motherboard is higher, it will be lowered by the CPU, but 667 is already very good.

Answer 2 question: I think dual-channel is better. Just like a human being, is it tiring to do it by hand? If two hands work alternately, it will save effort and speed up the work, but this exists Regarding compatibility issues, finding a well-known brand of memory should have better compatibility.