Originally Posted by forrestcupp
it is possible to have 2 pairs of memory that are different sizes or speeds and still be dual channel. Just as long as the 2 matching slots have the same memory. The only thing is that it will only run as fast as the slowest pair.
Okay let me get this right. So it is possible to have 2 paris of RAM that are different sizes or speed and be dual channel. But jsut as long as the slots have the same memory.
How can they be different and the same at the same time?
Yes you can run Channel 1&3 with 1GB sticks and Channel 2&4 with 512MB Sticks. Both pairs can run dual Channel. But they can not be different speeds. They will have to be the same speed. Not every motherboard ahs the capability to run RAM of different speeds. That statement is totally dependent on the type of hardware you are running.
While some mother boards you can run RAM of 800MHz and memory of 1033MHz and it will all run as 800MHz. But again this is dependent on the mother board to be able to clock down he 1 set of RAM. Not only that but the RAM has to be able o run at that speed as well. If the RAM is clocked at 1033MHz and above but not below trying to run it at 800MHz will cause you serious problems as that is slower than what it is rated.
So while Tom's Hardware is partially correct. They lefdt out some VERY important details in there. Each machine is different. Many OEM MAchines can NOT do these types of things. They have a motherboard that is only capable of runnin 1 speed of RAM.