Memory Configuration - Foxconn A9DA Series User Manual

Memory Configuration

CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc.
Memory Configuration
DCT Unganged Mode
↑↓←→:Move Enter:Select
► 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 (DDR3) :
■ DCT channels A and B can be ganged as a single logical 128-bit DIMM.
■ Offers highest DDR3 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.
Memory Configuration
[Always]
+/-/:Value F10:Save ESC:Exit
F9:Optimized Defaults
34
Help Item
This allows selection of
unganged DRAM mode
(64-bit width).
Auto= Ganged mode
Always=Unganged mode
F1:General Help