Intel BLKDH55TC - Three Dimms; Example Dual Channel Memory Configuration with Four Dimms; Example Dual Channel Memory Configuration with Three Dimms

Intel Desktop Board DH55TC Product Guide
38
If additional memory is to be used, install another matched pair of DIMMs in the
DIMM 1 (black) sockets of channels A and B (see Figure 15).
Figure 15. 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 the DIMM 0 (blue) socket of channel A and the
DIMM 0 (blue) socket of channel B. Install the third DIMM in the DIMM 1 (black)
socket of either channel A or channel B (see Figure 16).
Figure 16. Example Dual Channel Memory Configuration with Three DIMMs
NOTE
All other memory configurations will result in single channel memory operation.