Datasheet

Intel
®
Xeon
®
Processor C5500/C3500 Series
February 2010 Datasheet, Volume 1
Order Number: 323103-001 47
Interfaces
2.1.4.2.2 DIMM Population for Two Slots per Channel
For two DIMM slots per channel configurations, the processor requires DIMMs within a
channel to be populated starting with the DIMM slots furthest from the processor in a
“fill-furthest” approach (see Figure 8). In addition, when populating a Quad-rank DIMM
with a Single- or Dual-rank DIMM in the same channel, the Quad-rank DIMM must be
populated farthest from the processor. Intel recommends checking for correct
placement during BIOS initialization. Additionally, Intel strongly recommends that all
designs follow the DIMM ordering, command clock, and control signal routing
documented in Figure 8. This addressing must be maintained to be compliant with the
reference BIOS code supplied by Intel. All allowed DIMM population configurations for
two slots per channel are shown in Table 13 and Table 14.
Table 12. UDIMM Population Configurations Within a Channel for Three Slots per
Channel
Configuration
Number
POR Speed 1N or 2N DIMM2 DIMM1 DIMM0
1 DDR3-1333, 1066, & 800 1N Empty Empty Single-rank
2 DDR3-1333, 1066, & 800 1N Empty Empty Dual-rank
3 DDR3-1066 & 800 2N Empty Single-rank Single-rank
4 DDR3-1066 & 800 2N Empty Single-rank Dual-rank
5 DDR3-1066 & 800 2N Empty Dual-rank Single-rank
6 DDR3-1066 & 800 2N Empty Dual-rank Dual-rank
Figure 8. DIMM Population Within a Channel for Two Slots per Channel
Table 13. DIMM Population Configurations Within a Channel for Two Slots per Channel
(Sheet 1 of 2)
Configuration # POR Speed 1N or 2N DIMM1 DIMM0
1 DDR3-1333, 1066, & 800 1N Empty Single-rank
2 DDR3-1333, 1066, & 800 1N Empty Dual-rank
3 DDR3-1066 & 800 1N Empty Quad-rank
4 DDR3-1066 & 800 1N Single-rank Single-rank
5 DDR3-1066 & 800 1N Single-rank Dual-rank
6 DDR3-1066 & 800 1N Dual-rank Single-rank
7 DDR3-1066 & 800 1N Dual-rank Dual-rank
CLK:
Processor
D
I
M
M
0
0/1
0/1
D
I
M
M
1
P1/N1
2/3
2/3
Chip Select:
ODT:
P0/N0
0/21/3CKE:
Fill
Second
Fill
First