actually the first 2 stick will run in Dual ch. the third stick in single channel. but this can bring unexpected problems & also performance going take a hit.
Can you please try out what you say and confirm it in CPU-Z?
Coz if it is what you say, i will give myself a hard whack on my head and need to clear out the old stuff and input some fresh and correct info.
From what i remember, especially from the older motherboards, loosely put it went something like
- an even number of RAM sticks of same capacity (preferably identical/matched), in the appropriate slots, should work in dual channel
- an even number of sticks, with different capacity on any stick, will run in single channel
- an odd number of RAM sticks, irrespective of capacity of each stick will always work in single channel.
For the best dual-channel memory performance on motherboards with the Intel dualchannel
DDR chipsets, you must use identically paired memory modules in DIMM
sockets 0 of channel A and B. Identically paired memory modules must also be used
when populating DIMM sockets 1 of channel A and B. One can, for example, plug in
matching 256MB DIMMs in both DIMM 0 slots, and plug in matching 512MB DIMMs in
both DIMM 1 slots.
In this context, “matching” modules means:
1. Both modules are the same capacity (e.g. both are 256MB, or 512MB)
2. Both modules are the same speed (e.g. both are PC2700 or PC3200)
3. Both have the same number of chips and module sides (e.g. both have the
same number of chips on the module, and both are either single-sided or
double-sided).
For the Intel platforms based upon the Intel 865 or 875 chipsets, the rules can be
summarized as follows:
In the following diagram, the top section indicates 'dual channel' and the lower one indicates 'single channel' scenario.
*img8.imageshack.us/img8/446/singlevsdualchanneldiag.jpg
Source: *www.kingston.com/newtech/MKF_520DDRwhitepaper.pdf