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X8ST3-F/X8STE User's Manual
Memory Support
The X8ST3-F/X8STE supports up to 24 GB Unbuffered ECC or Non ECC DDR3
1333/1066/800 in 6 DIMM slots. Populating these DIMM modules with a pair (or
pairs) of memory modules of the same type and same size will result in interleaved
memory, which will improve memory performance.
DIMM Module Population Conguration
For memory to work properly, follow the table below for memory installation:
Memory Population (UDIMM Only Routing)
DIMM
Slots per
Channel
DIMMs
Populated
per Channel
DIMM Type POR Speeds
(in MHz)
Ranks per DIMM
(any combination;
SR=Single Rank,
DR=Dual Rank)
2 1 Unbuffered DDR3
(with or without ECC)
800,1066,1333 SR, DR
2 2 Unbuffered DDR3
(with or without ECC)
800,1066, SR, DR
Population Rules: Any combination of x8 and x16 UDIMMs, with 1Gb or 2Gb DRAM density.
Memory Population (UDIMM 3 DIMMs per Channel Routing)
DIMM
Slots per
Channel
DIMMs
Populated
per Channel
DIMM Type POR Speeds
(in MHz)
Ranks per DIMM
(any combination;
SR=Single Rank,
DR=Dual Rank)
3 1 Unbuffered DDR3
(with or without ECC)
800,1066,1333 SR, DR
3 2 Unbuffered DDR3
(with or without ECC)
800,1066, SR, DR
Population Rules: Any combination of x8 UDIMMs, with 1Gb or 2Gb DRAM density.
Maximum Memory Possible
Single Rank UDIMMs - 12GB (6x 2GB DIMMs), Dual Rank UDIMMs -
24GB (6x 4GB DIMMs)
Note 1: Both Unbuffered ECC and Non-ECC DIMM modules are supported
by the motherboard. Using ECC or Non-ECC memory on your motherboard
depends on the CPU installed.
Note 2: Due to OS limitations, some operating systems may not show
more than 4 GB of memory.
Note 3: Due to memory allocation to system devices, the amount of
memory that remains available for operational use will be reduced when
4 GB of RAM is used. The reduction in memory availability is dispropor-
tional. Refer to the table on the next page. For Microsoft Windows users:
Microsoft implemented a design change in Windows XP with Service
Pack 2 (SP2) and Windows Vista. This change is specic to the Physical
