Intel DZ68ZV

Installing and Replacing Desktop Board Components
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Figure 16. Example Dual Channel Memory Configuration with Four DIMMs
Three DIMMs
If you want to use three DIMMs in a dual-channel configuration, install a matched pair
of DIMMs equal in speed and size in DIMM 1 and DIMM 3 of channel A. Then install
another DIMM equal to the speed and total size of the DIMMs installed in channel A in
either DIMM 2 or DIMM 4 of channel B (Figure 17).
Figure 17. Example Dual Channel Memory Configuration with Three DIMMs
NOTE
All other memory configurations will result in single channel memory operation.