Gigabyte GA-K8NS Ultra-939 User Manual page 17

Dual Channel DDR:
GA-K8NS Ultra-939 supports Dual Channel Technology.
When Dual Channel Technology is activated, the bandwidth of memory bus will be double the original
one,with the fastest speed at 6.4GB/s(DDR400) or 5.3GB/s(DDR333).
GA-K8NS Ultra-939 includes four DIMM slots, and each Channel has 2 DIMMs as following:
Channel A : DDR 1, DDR 3
Channel B : DDR 2, DDR 4
Below are the explanations:
1. One, DDR memory module is installed: The Dual Channel Technology will not operate
when one, DDR memory modules is installed and it will only work as Single Channel.
2. Two DDR memory modules are installed (the same memory size and type):
The Dual Channel Technology will operate when two DDR memory modules are inserted
individually into Channel A and Channel B (DDR 1 pairs up with DDR 2 and DDR 3, 4).
However, if the two DDR memory modules are inserted into the same Channel (DDR 1,
3 or DDR 2,4) then Dual Channel Technology will not operate.
3. If four DDR memory modules are installed (two pairs of DDR memory modules with the
same memory size and type): The Dual Channel Technology will operate when a pair of
DDR memory modules are inserted into DDR 1, 2 and another pair into DDR 3,4.
The following tables include all memory-installed combination types:
(Please note that those types not in the tables will not boot up.)
Figure 1: Dual Channel Technology (DS: Double Side, SS: Single Side)
2 memory modules
4 memory modules
Figure 2: Non Dual Channel Technology (DS: Double Side, SS: Single Side)
1 memory module
2 memory module
The GA-K8NS Ultra-939 doesn't support 3 memory modules. If 3 memory modules are
inserted, the system will not boot.
DDR 1 DDR 2
DS/SS DS/SS
X X
DS/SS DS/SS
DDR 1
DS/SS
X
DS/SS
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DDR 3 DDR 4
X X
DS/SS DS/SS
DS/SS DS/SS
DDR 3
X
DS/SS
DS/SS
Hardware Installation Process