I often have readers who want to buy a new PC, but who only put an 8GB module in their machine! They simply have no idea of the difference it makes to have two RAM modules in ‘dual channel’, instead of having just one module.
That said, why is it always better to have 2 RAM modules (4 + 4 or 8 + 8)? Wouldn't it be simpler to have just one module?
This is something that depends a lot on the processor, motherboard and even the way you put the modules in the slots on the motherboard. However, the truth is that the vast majority of modern computers support two communication channels on the memory controller.
Thus, if this support exists on your motherboard, then the assembled RAM memory modules can be accessed in parallel to basically double the speed of access from the processor to the memory.
In short, if applications that depend heavily on the speed of access to the system memory are used, doubling the access speed of the processor is half way to significantly increase performance.
Basically, it is the same reason why it is better to have a popular motorway with 4 lanes instead of just 2!
So if you are using dual channel memory, it will double the bandwidth. Which in turn means that you will pass twice as much information over the same amount of time.
That said, if you just use your PC to browse the web, having single-channel or dual-channel is completely irrelevant. (Just like a motorway in hours of low usage). But if you happen to use heavier programs, you will immediately feel the performance improvement.
(Special) Is it always better to have 2 RAM modules? – Besides, what do you think about all this? Share your opinion with us in the comments below.