It affects bandwidth.... which in turn can affect a lot more
Originally Posted by PARTON
Will two sticks run in dual channel while the third runs in single?
This is right...almost. Your RAM will be running in dual channel to use/when using only the 2x2GB, in the proper slots. When the extra 2GB is also being used, then the entire setup will revert to single channel and then you will lose performance. This is called interleaving
. Since most memory benchmarks don't use up all memory, chances are they will appear to show the memory as "dual channel" while running 3 DIMMs. This was detailed in the first dual channel spec sheets all the way back in 2003 when Intel introduced it.
Stevinchy is also correct:
Edited by xd_1771 - 4/9/11 at 8:52pm
Originally Posted by Stevinchy
Incorrect, they will run in what is called flex mode. In this mode the lowest address space in each channel will run in dual channel mode up to the amount matched in the other and the rest will run in single.
For example if you have 2gb in 1 channel and 3gb in the other then 2gb from each channel will run in duel and the remaining 1gb will run on its own in single.