Foxconn A78AX 3.0 English Manual. - Page 35

Memory Configuration

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3 Memory Configuration CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc. Memory Configuration Memory Configuration Help Item DCT Unganged Mode [Always] This allows selection of unganged DRAM mode (64-bit width). Auto = Ganged mode Always = Unganged mode Move Enter:Select +/-/:Value F10:Save ESC:Exit F1:General Help F9:Optimized Defaults ► DCT Unganged Mode DCT stands for DRAM Controller. Ganged refers to the use of both DRAM controllers within a memory controller acting in concert to access memory. For a description of ganged (128-bit DRAM data width) and unganged (64-bit DRAM data width) DRAM modes : Ganged channels (DDR2) : ■ DCT channels A and B can be ganged as a single logical 128-bit DIMM. ■ Offers highest DDR2 bandwidth. ■ Requires both DIMMs in a logical pair to have identical size and timing parameters, both DCTs programmed identically. Unganged channels ■ DCT channels A and B operate as two completely independent 64-bit channels (both channels operate at the same frequency). ■ Reduce DRAM page conflicts - more concurrent open dram pages . ■ Better bus efficiency. Burst lengths supported when both DCTs are enabled in unganged mode, BIOS must initialize the frequency of each DCT in order. 28

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3
28
Memory Configuration
► DCT Unganged Mode
DCT stands for DRAM Controller.
Ganged refers to the use of both DRAM controllers within a memory controller acting in con-
cert to access memory. For a description of ganged (128-bit DRAM data width) and unganged
(64-bit DRAM data width) DRAM modes :
Ganged channels (DDR2) :
■
DCT channels A and B can be ganged as a single logical 128-bit DIMM.
■
Offers highest DDR2 bandwidth.
■
Requires both DIMMs in a logical pair to have identical size and timing parameters, both
DCTs programmed identically.
Unganged channels
■
DCT channels A and B operate as two completely independent 64-bit channels (both chan
-
nels operate at the same frequency).
■
Reduce DRAM page conflicts – more concurrent open dram pages .
■ Better bus efficiency.
Burst lengths supported when both DCTs are enabled in unganged mode, BIOS must initialize
the frequency of each DCT in order.
CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc.
Memory Configuration
Memory Configuration
Help Item
DCT Unganged Mode
This
allows
selection
of unganged DRAM mode
(64-bit width).
Auto = Ganged mode
Always = Unganged mode
↑↓←→:Move
Enter:Select
+/-/:Value
F10:Save
ESC:Exit
F1:General Help
F9:Optimized
Defaults
[Always]