Service Guide

Workstation System Features
Intel® Workstation System SC5650SCWS Service Guide 19
 When installing Quad-rank DIMM, must populate Quad-Rank DIMM starting with the first slot of each
memory channel.
For a complete list of supported memory DIMMs, see the links under “Additional Information and Software”.
Channel Population Requirements for Memory RAS Modes
The Intel
®
Workstation System SC5650SCWS supports two memory RAS modes: Independent Channel Mode,
and Mirrored Channel Mode. The rules on channel population and channel matching vary by the RAS mode
used. Note that support of RAS modes that require matching DIMM population between channels (Mirroring)
and require that ECC DIMMs be populated.
Independent Channel Mode
You can populate channels in any order in Independent Channel Mode. You can populate all three channels in
any order and have no matching requirements. All channels must run at the same interface frequency, but
individual channels may run at different DIMM timings (RAS latency, CAS latency, and so forth).
Mirrored Channel Mode
In Mirrored Channel Mode, the memory contents are mirrored between Channel A (D) and Channel B (E). As
a result of the mirroring, the total physical memory available to the system is half of what is populated.
Mirrored Channel Mode requires that Channel A (D) and Channel B (E) must be populated identically. DIMM
slot populations within a channel do not have to be identical but the same DIMM slot location across Channel
A (D) and Channel B (E) must be populated the same. Channel C (F) is unused in Mirrored Channel Mode.
/
NOTE
For help with memory population rules, see the Intel
®
Workstation System SC5650SCWS Technical Product
Specification.
Optional Hardware
Intel
®
SAS Entry RAID Module AXX4SASMOD
The Intel
®
Workstation System SC5650SCWS provides a SAS module slot (J2J1) for the installation of an
optional Intel
®
SAS Entry RAID Module AXX4SASMOD. Once the optional Intel
®
SAS Entry RAID Module
AXX4SASMOD is present, the x4 PCI Express* links from the ICH10R to PCI Express* Slot 2 (x8 mechanically,
x4 electrically) switches to the SAS module slot.
The optional Intel
®
SAS Entry RAID Module AXX4SASMOD includes a SAS1064e controller that supports x4
PCI Express* link widths and is a single-function PCI Express* end-point device. The SAS controller supports
the SAS protocol as described in the Serial Attached SCSI (SAS) Standard, version 1.0, and also supports
SAS 1.1 features. A 32-bit external memory bus off the SAS1064e controller provides an interface for Flash
ROM and NVSRAM (Non-volatile Static Random Access Memory) devices.
The optional Intel
®
SAS Entry RAID Module AXX4SASMOD provides four SAS connectors that support up to
six hard drives in the Intel
®
Workstation System SC5650SCWS.
The optional Intel
®
SAS Entry RAID Module AXX4SASMOD also provides a SGPIO (Serial General Purpose
Input/Output) connector and a SCSI Enclosure Services (SES) connector for non-expander backplane drive
LED control.