ASRock 775Dual-VSTA User Manual - Page 17
Installation of Memory Modules DIMM - what of memory
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2.5 Installation of Memory Modules (DIMM) 775Dual-VSTA motherboard provides two 184-pin DDR (Double Data Rate) DIMM slots and two 240-pin DDRII DIMM slots, and supports Dual Channel 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_2; Yellow slots; see p.10 No.6) or identical DDR DIMM pair in Dual Channel B (DDR1 and DDR2; Blue slots; see p. 10 No.7), so that Dual Channel Memory Technology can be activated. You may refer to the Dual Channel Memory Configuration Table below. Dual Channel Memory Configurations DDRII_1 DDR1 DDRII_2 DDR2 (Yellow Slot) (Blue Slot) (Yellow Slot) (Blue Slot) (1) Populated - Populated - (2) - Populated - Populated 1. It is not allowed to install a DDR memory module into DDRII slot or a DDRII memory module into DDR slot; otherwise, this motherboard and DIMM may be damaged. 2. It is not allowed to install both DDR and DDRII memory modules to this motherboard at the same time; otherwise, this motherboard and DIMM may be damaged. 17