Dual Channel - Acer Veriton 7900Pro Service Manual

Dual Channel

VT x800 series support the Dual Channel Technology. After operating the dual channel
technology, the bandwidth of memory bus will add double up to 4GB/s.
The mainboard inculdes 4 DIMM slots, and each channel has two DIMM sockets as following:
Channel A : DDR1, DDR3
Channel B : DDR2 , DDR4
If you want to operate the Dual Channel Technology, please note the following explanations due to
the limitation of Intel chipset specifications.
Memory Number
1 Only one DDR memory module is
installed ?
2 Two DDR memory modules are
installed ( the same memory size and
type) ?
3 Three DDR memory modules are
installed ?
4 Four DDR memory modules are
installed ?
NOTE: We strongly recommend user to slot two DDR memory modules into the DIMMs with the same color in
order for Dual Channel Technology to work.
The following tables include all memory-installed combination types:
Dual Channel Technology (DS: Double Side, SS: Single Side)
2 memory modules
4 memory modules
Don't operate Dual Channel Technology (DS:Double Side, SS: Single Side)
1 memory module
2 memory module
3 memory module
30
The Dual Channel Technology can't operate when only one DDR
memory module is installed.
The Dual Channel Technology will operate when two memory
modules are inserted individually into Channel A and B. If you
install two memory modules in the same channel, the Dual
Channel Technology will not operate.
Pleae note that the Dual Channel Technology will not operate
when three DDR memory modules are installed; part of them will
not be detected.
If you install four memory modules at the same time, the Dual
Channel Technology will operate only when those modules have
the same size and type.
DDR1 DDR2
DS/SS
X DS/SS
DS/SS DS/SS
DDR1 DDR2
DS/SS X
X DS/SS
X X
X X
DS/SS DS/SS
X X
DS/SS DS/SS
DS/SS DS/SS
DS/SS X
X DS/SS
Description
DDR3
X DS/SS
X
DS/SS
DDR3
X
X
DS/SS
X
X
DS/SS
DS/SS
X
DS/SS
DS/SS
DDR4
X
DS/SS
DS/SS
DDR4
X
X
X
DS/SS
X
DS/SS
X
DS/SS
DS/SS
DS/SS
Chapter 1