ASRock 775i915P-SATA2 Quick Installation Guide - Page 12

2.3 Installation of Memory Modules (DIMM) 775i915P-SATA2 motherboard provides four 240-pin DDRII (Double Data Rate) DIMM slots, two 184-pin DDR (Double Data Rate) DIMM slots, and supports Dual Channel DDR/DDRII Memory Technology. For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR/DDRII DIMM pair in the slots of the same color. In other words, you have to install identical DDRII DIMM pair in Dual Channel A (DDRII_1 and DDRII_3; Yellow slots; see p.2 No.6) or identical DDRII DIMM pair in Dual Channel B (DDRII_2 and DDRII_4; Orange slots; see p.2 No.7), so that Dual Channel Memory Technology can be activated. You can also install identical DDR DIMM pair in Dual Channel (DDR1 and DDR2; Blue slots; see p.2 No.8) so that Dual Channel Memory Technology can be activated.This motherboard also allows you to install four DDRII DIMMs for dual channel configuration, and please install identical DDRII DIMMs in all four slots. You may refer to the Dual Channel Memory Configuration Table below. Dual Channel Memory Configurations DDRII_1 DDRII_2 DDR1 DDRII_3 DDRII_4 DDR2 (Yellow Slot) (Orange Slot) (Blue Slot) (Yellow Slot) (Orange Slot) (Blue Slot) (1) Populated - - Populated - - (2) - Populated- - - Populated - (3) Populated Populated - Populated Populated - (4) - - Populated - - Populated * For the configuration (3), please install identical DDRII DIMMs in all four DDRII slots. English 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 either in the set of yellow slots (DDRII_1 and DDRII_3), in the set of orange slots (DDRII_2 and DDRII_4), or in the set of blue slots (DDR1 and DDR2). 2. If only one memory module or three memory modules are installed in the DDR/DDRII 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 DDR into DDRII slot or DDRII into DDR slot; otherwise, this motherboard and DIMM may be damaged. 5. It is not allowed to install both DDR and DDRII to this motherboard at the same time; otherwise, this motherboard and DIMM may be damaged. 12 ASRock 775i915P-SATA2 Motherboard