Foxconn Inferno Katana - Manual (Page 56)

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C-Addr (Command-address) reference voltage is reference DRAM voltage, the actual refer-
ence voltage will be DRAM voltage multiply this item value. The default value is: [0.80V].
► DIMM3,4 Vref C-Addr
CA (Command-address) and DQ (Data line) reference voltage is reference DRAM voltage,
the actual reference voltage will be DRAM voltage multiply this item value. The default value
is: [0.80V].