Intel i7-3920XM Extreme AW8063801009607 User Manual

Datasheet, Volume 2

255

Processor Configuration Registers 

This register defines channel characteristics – number of DIMMs, number of ranks, size, 
interleave options.

31:26

RO

0h

25:24

RO

00b

23

RO

0h

22

RW-L

1b

Uncore

Enhanced Interleave mode (Enh_Interleave) 
0 = off 

1 = on

21

RW-L

1b

Uncore

Rank Interleave (RI)
0 = off 

1 = on

20

RW-L

0b

Uncore

DIMM B DDR width (DBW) 
0 = X8 chips 

1 = X16 chips

19

RW-L

0b

Uncore

DIMM A DDR width (DAW) 
0 = X8 chips 

1 = X16 chips

18

RW-L

0b

Uncore

DIMM B number of ranks (DBNOR) 
0 = single rank 

1 = dual rank

17

RW-L

0b

Uncore

DIMM A number of ranks (DANOR) 
0 = single rank 

1 = dual rank

16

RW-L

0b

Uncore

DIMM A select (DAS) 
Selects which of the DIMMs is DIMM A – should be the larger 

DIMM.
0 = DIMM 0 

1 = DIMM 1

15:8

RW-L

00h

Uncore

Size of DIMM B (DIMM_B_Size) 
Size of DIMM B in 256 MB multiples

7:0

RW-L

00h

Uncore

Size of DIMM A (DIMM_A_Size) 
Size of DIMM A in 256 MB multiples