Gigabyte GA-946GM-DS2 User Manual page 15

The GA-946GM-DS2/S2 includes 4 DIMM sockets, and each Channel has two DIMM sockets as
following:
Channel 0 : DDRII1, DDRII2
Channel 1 : DDRII3, DDRII4
If you want to operate the Dual Channel Technology, please note the following explanations due
to the limitation of Intel chipset specifications.
1. Dual Channel mode will not be enabled if one or three DDR II memory modules are
installed.
2. To enable Dual Channel mode with two or four memory modules (it is recommended to
use memory modules of identical brand, size, chips, and speed), install the memory
according to the dual channel memory configuration table below (Figure 1).
Dual Channel Memory Configuration Table (DS: Double Side, SS: Single Side, X: Empty)
2 memory modules
4 memory modules
Memory configurations below will cause DDRII 667 memory to operate at 533 MHz (with 1066/800 MHz
FSB CPU) and DDRII 533 at 400 MHz (with 800 MHz FSB CPU).
(DS: Double Side, SS: Single Side, X: Empty)
2 memory modules
3 memory modules
4 memory modules
Because of chipset limitations, do not populate both DIMM sockets of the same channel
(e.g. DDRII1 and DDRII2) with double-sided memory modules to prevent system's failure to
start or incorrect detection of memory modules.
Dual Channel Memory Configuration
The GA-946GM-DS2/S2 supports the Dual Channel Technology. After oper-
ating the Dual Channel Technology, the bandwidth of Memory Bus will
double.
DDRII1 DDRII2
DS/SS X
DS/SS X
X DS/SS
X DS/SS
SS SS
Figure 1
DDRII1 DDRII2
SS SS
X X
SS SS
SS SS
DS/SS X
X DS/SS
SS SS
Figure 2
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DDRII3 DDRII4
DS/SS X
X DS/SS
DS/SS X
X DS/SS
SS SS
DDRII3 DDRII4
X X
SS SS
DS/SS X
X DS/SS
SS SS
SS SS
SS SS
Hardware Installation