IBM X3850 X6 Product Guide

IBM System x3850 X6 16
The server also supports IBM eXFlash DIMMs, which are also installed in the DIMM slots. The "IBM

eXFlash memory-channel storage" section describes these eXFlash DIMMs and the configuration
rules.
The following table shows the characteristics of the supported DIMMs. Tables cells that are highlighted
with a gray background indicate that the server supports higher memory frequencies or larger memory
capacity (or both) than the Intel processor specification defines.
Memory speed: In performance mode, memory channels operate independently, and the SMI2 link
operates at twice the DDR3 speed. In RAS mode, two channels operate synchronously, and the SMI2 link
operates at the DDR3 speed.
Table 5. Maximum memory speeds
DIMM
specification
RDIMM LRDIMM
Rank Single rank Dual rank Quad rank 8-rank
Part numbers 00D5024 (4GB)
00D5036 (8GB)
46W0672 (16GB) 46W0676 (32GB) 46W0741 (64GB)
Rated speed 1600 MHz 1600 MHz 1600 MHz 1333 MHz
Rated voltage 1.35 V 1.35 V 1.35 V 1.35 V
Operating voltage 1.35 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 V
Max qty supported* 96 96 96 96 96 96 96 96
Max DIMM capacity 8 GB 8 GB 16 GB 16 GB 32 GB 32 GB 64 GB 64 GB
Max memory capacity 0.75 TB 0.75 TB 1.5 TB 1.5 TB 3 TB 3 TB 6 TB 6 TB
Maximum operating speed - Performance mode (2:1 mode - SMI2 link operates at twice the DDR3 speed
shown)
1 DIMM per channel 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz
2 DIMMs per channel 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz
3 DIMMs per channel 1066 MHz 1333 MHz 1066 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz
Maximum operating speed - RAS mode (1:1 mode - SMI2 link operates at the DDR3 speed shown)
1 DIMM per channel 1333 MHz 1600 MHz 1333 MHz 1600 MHz 1333 MHz 1600 MHz 1333 MHz 1333 MHz
2 DIMMs per channel 1333 MHz 1600 MHz 1333 MHz 1600 MHz 1333 MHz 1600 MHz 1333 MHz 1333 MHz
3 DIMMs per channel 1066 MHz 1333 MHz 1066 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz 1333 MHz
* Maximum quantity supported is shown for all processors that are installed.
The following memory protection technologies are supported:
ECC

Chipkill (for x4-based memory DIMMs)

Redundant bit steering (Double Device Data Correction)

Memory mirroring

Memory rank sparing

Chipkill and Redundant Bit Steering are supported in RAS mode. Chipkill is supported in Performance
mode.

IBM X3850 X6 Specifications

General

Brand	IBM
Model	X3850 X6
Category	Server
Language	English