Intel Desktop Board DG33BU Product Guide 
34 
Installing and Removing Memory 
 
NOTE  
To be fully compliant with all applicable Intel SDRAM memory specifications, the board 
requires DIMMs that support the Serial Presence Detect (SPD) data structure.  
Desktop board DG33BU has four 240-pin DDR2 DIMM sockets arranged as DIMM 0 and 
DIMM 1 in both Channel A and Channel B.   
 
NOTE 
Regardless of the memory configuration used (dual or single channel), Channel A, 
DIMM 0 must always be populated.  This is a requirement of the ICH9DH Manageability 
Engine feature.   
 
Guidelines for Dual Channel Memory Configuration   
Before installing DIMMs, read and follow these guidelines for dual channel 
configuration. 
Two or Four DIMMs 
Install a matched pair of DIMMs equal in speed and size (see Figure 13) in DIMM 0 
(blue) of channels A and B.  
 
Figure 13.  Dual Channel Memory Configuration with Two DIMMs