ASRock 4Core1600Twins-P35 User Manual - Page 18

and DDRII_2, it is unable to activate the Dual Channel Memory

Page 18 highlights

1. If you want to install two memory modules, for optimal compatibility and reliability, it is recommended to install them in the slots of the same color. In other words, install them in the set of green slots (DDR3_A1 and DDR3_B1), in the set of yellow slots (DDRII_1 and DDRII_3), or in the set of orange slots (DDRII_2 and DDRII_4). 2. If only one memory module or three memory modules are installed in the DDR2 DIMM slots on this motherboard, it is unable to activate the Dual Channel Memory Technology. If only one memory module is installed in the DDR3 DIMM slots on this motherboard, it is unable to activate the Dual Channel Memory Technology. 3. If a pair of memory modules is NOT installed in the same Dual Channel, for example, installing a pair of memory modules in DDRII_1 and DDRII_2, it is unable to activate the Dual Channel Memory Technology . 4. It is not allowed to install a DDR3 memory module into DDR2 slot or install a DDR2 memory module into DDR3 slot; otherwise, this motherboard and DIMM may be damaged. 5. DDR2 and DDR3 memory modules cannot be installed on this motherboard at the same time. 18

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1.
If you want to install two memory modules, for optimal compatibil-
ity and reliability, it is recommended to install them in the slots of
the same color. In other words, install them in the set of green
slots (DDR3_A1 and DDR3_B1), in the set of yellow slots (DDRII_1
and DDRII_3), or in the set of orange slots (DDRII_2 and DDRII_4).
2.
If only one memory module or three memory modules are installed
in the DDR2 DIMM slots on this motherboard, it is unable to acti-
vate the Dual Channel Memory Technology. If only one memory
module is installed in the DDR3 DIMM slots on this motherboard,
it is unable to activate the Dual Channel Memory Technology.
3.
If a pair of memory modules is NOT installed in the same Dual
Channel, for example, installing a pair of memory modules in DDRII_1
and DDRII_2, it is unable to activate the Dual Channel Memory
Technology .
4.
It is not allowed to install a DDR3 memory module into DDR2 slot
or install a DDR2 memory module into DDR3 slot; otherwise, this
motherboard and DIMM may be damaged.
5.
DDR2 and DDR3 memory modules cannot be installed on this
motherboard at the same time.