Asus DSBF-DM SAS User Manual page 42

Two DIMM per channel (Dual ranks)
Branch1
Two DIMM per channel (Single rank)
Branch1
2-22
Rank 0
(512 MB)
Sparing
Memory space
512 MB
Rank 0
(1024 MB)
Sparing
Memory space
1024 MB
Total Memory
Sparing
Memory space
Sparing
Memory space
Total Memory
Channel 0
DIMM_20
(1024MB/2 Ranks)
Rank 1
(512 MB)
512 MB
DIMM_21
(2048MB/2 Ranks)
Rank 1
(1024 MB)
4096 MB
Channel 0
DIMM_20
(512MB/1 Ranks)
Rank 0
(512 MB)
512 MB
DIMM_21
(1024MB/1 Ranks)
Rank 0
(1024 MB)
1024 MB
Chapter 2: Hardware information
Channel 1
DIMM_30
(1024MB/2 Ranks)
Rank 0 Rank 1
(512 MB) (512 MB)
512 MB 512 MB
DIMM_31
(2048MB/2 Ranks)
Rank 0 Rank 1
(1024 MB) (1024 MB)
1024 MB
Channel 1
DIMM_30
(512MB/1 Ranks)
Rank 0
(512 MB)
512 MB
DIMM_31
(1024MB/1 Ranks)
Rank 0
(1024 MB)