Intel SC5650BCDP Technical Product Specification

Functional Architecture Intel
®
Server Board S5500BC TPS
Intel order number: E42249-009 Revision 1.8
24
The rules for determining the operating frequency of the memory channels are simple, but not
necessarily straightforward. There are several limiting factors, including the number of DIMMs
on a channel and organization of the DIMM (single-SR, double-DR, or quad-rank-QR):
  800, 1066, or 1333 MHz  is the maximum speed
possible.
 The speed of the slowest component  the slowest DIMM or the IMC  determines the
maximum frequency, subject to further limitations.
 A single 1333 MHz DIMM (SR or DR) on a channel may run at full 1333 MHz speed.
 If two SR/DR DIMMs are installed on a channel, the speed is limited to 1066 MHZ.
 A single QR RDIMM on a channel is limited to 1066 MHz.
In addition, rules in the following table also determine the global common memory system
frequency.
Table 8. Memory Operating Frequency Determination for Intel® processor 5500 series
DIMM Type
DIMM
Populated
per Channel
IMC Frequency of Installed Processors
(1333MHz, 1066MHz, or 800MHz)
Ranks Per
DIMM
SR: Single-
Rank
DR: Dual-
Rank;
QR: Quad-
Rank
Remark
1333MHz
1066MHz
800MHz
Memory Running Frequency (Y/N)
800MHz
1066MHz
1333MHz
RDIMM or
UDIMM
1
Y
Y
Y
(max)
SR or DR
1 DPC (SR/DR) runs at fastest
common frequency of DIMMs
and processor IMCs
RDIMM
1
Y
Y
(max)
N
QR Only
1 QR RDIMM runs at 1066MHz
maximum
RDIMM or
UDIMM
2
Y
Y
(max)
N
Mixing SR,
DR
2 DPC (SR/DR) run at
1066MHz maximum
RDIMM
2
Y
(max)
N
N
Mixing SR,
DR, QR
When a QR RDIMM is on a
channel with any other
RDIMM, maximum frequency
is 800MHz

Intel SC5650BCDP Specifications

General

Brand	Intel
Model	SC5650BCDP
Category	Server
Language	English