Memory Support

The H8DCT-(IBQ)F supports up to 32GB of DDR3 ECC/Non-ECC UDIMM or up to 128GB of ECC DDR3 RDIMM (1333/1066MHz in 12 DIMM slots). Populating DIMMs in pairs, one per channel (2, 4 or 6 DIMMs/CPU), the same DIMM type in each channel, the same amount of memory on each CPU will improve memory performance. Please refer to the table below:

Table 1 - Per channel populations options
  DIMM A DIMM B DIMM C Max. MHz, 1.5V DIMMs Max. MHz, 1.35V DIMMs (6 core only) Max. GB / channel
UDIMM SR or DR Empty Empty 1333 MHz 1333 MHz 4 GB
SR Empty SR 1333 MHz 1333 MHz 4 GB
RDIMM SR or DR Empty Empty 1333 MHz 1333 MHz 8 GB
SR Empty SR 1333 MHz 1333 MHz 8 GB
SR SR SR 1066 MHz 800 MHz 12 GB
Empty QR Empty 800 MHz 800 MHz 16 GB
DR DR DR 800 MHz 800 MHz 24 GB
SR or DR QR Empty 800 MHz 667 MHz 24 GB
SR or DR QR SR or DR 667 MHz 667 MHz 32 GB
Note: Quad-rank DIMM must be DIMM B.


Table 2 - Memory Population for Optimal Performance For a Motherboard with One CPU (CPU1) Installed
# DIMMs CPU Channel 1 Channel 2
2 DIMMs CPU 1 P1-1A     P1-2A    
4 DIMMs CPU 1 P1-1A   P1-1C P1-2A   P1-2C
6 DIMMs CPU 1 P1-1A P1-1B P1-1C P1-2A P1-2B P1-2C


Table 3 - Memory Population for Optimal Performance For a Motherboard with Two CPU (CPU1 & CPU2) Installed
# DIMMs CPU Channel 1 Channel 2
4 DIMMs CPU 1 P1-1A     P1-2A    
CPU 2 P2-1A     P2-2A    
8 DIMMs CPU 1 P1-1A   P1-1C  P1-2A   P1-2C 
CPU 2 P2-1A    P2-1C P2-2A    P2-2C
12 DIMMs CPU 1 P1-1A P1-1B P1-1C P1-2A P1-2B P1-2C
CPU 2 P2-1A P2-1B P2-1C P2-2A P2-2B P2-2C

UDIMM: Unbuffered DIMM
RDIMM: Registered DIMM