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Option, Description, Sub NUMA Cluster

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Option Description Maximum data rate indicates that the BIOS runs the communication links at the maximum frequency supported by the processors. You can also select specific frequencies that the processors support, which can vary. For best performance, you should select Maximum data rate. Any reduction in the communication link frequency affects the performance of non-local memory accesses and cache coherency traffic. In addition, it can slow access to non-local I/O devices from a particular CPU. However, if power saving considerations outweigh performance, you might want to reduce the frequency of the CPU communication links. If you do this, you should localize memory and I/O accesses to the nearest NUMA node to minimize the impact to system performance. Virtualization Technology Enables or disables the virtualization technology for the processor. This option is set to Enabled by default. Adjacent Cache Line Prefetch Optimizes the system for applications that need high utilization of sequential memory access. This option is set to Enabled by default. You can disable this option for applications that need high utilization of random memory access. Hardware Prefetcher Enables or disables the hardware prefetcher. This option is set to Enabled by default. Software Prefetcher Enables or disables the software prefetcher. This option is set to Enabled by default. DCU Streamer Prefetcher Enables or disables the Data Cache Unit (DCU) streamer prefetcher. This option is set to Enabled by default. DCU IP Prefetcher Enables or disables the Data Cache Unit (DCU) IP prefetcher. This option is set to Enabled by default. Sub NUMA Cluster Enables or disables the Sub NUMA Cluster. This option is set to Disabled by default. UPI Prefetch Enables you to get the memory read started early on DDR bus. The Ultra Path Interconnect (UPI) Rx path will spawn the speculative memory read to Integrated Memory Controller (iMC) directly. This option is set to Enabled by default. LLC Prefetch Enables or disables the LLC Prefetch on all threads. This option is set to Disabled by default. Dead Line LLC Alloc When enabled, it opportunistically fill dead lines in LLC. When disabled, it never fill dead lines in LLC. This option is set to Enabled by default. Directory AtoS AtoS optimization reduces remote read latencies for repeat read accesses without intervening writes. This option is set to Disabled by default. Logical Processor Idling Enables you to improve the energy efficiency of a system. It uses the operating system core parking algorithm and parks some of the logical processors in the system which in turn allows the corresponding processor cores to transition into a lower power idle state. This option can only be enabled if the operating system supports it. It is set to Disabled by default. Configurable TDP Enables you to configure the TDP level. The available options are Nominal, Level 1, and Level 2. This option is set to Nominal by default. NOTE: This option is only available on certain stock keeping units (SKUs) of the processors. x2APIC Mode Number of Cores per Processor Processor Core Speed Processor Bus Speed Processor n Enables or disables the x2APIC mode. This option is set to Enabled by default. Controls the number of enabled cores in each processor. This option is set to All by default. Specifies the maximum core frequency of the processor. Displays the bus speed of the processor. The following settings are displayed for each processor installed in the system: Option Description Family-ModelStepping Specifies the family, model, and stepping of the processor as defined by Intel. 26 Pre-operating system management applications

Section	Page
Dell EMC PowerEdge R740xd2 Installation and Service Manual	3
About this document	8
Dell EMC PowerEdge R740xd2 system overview	9
Front view of the system	9
Control panels	10
Left control panel	10
Right control panel	10
Rear view of the system	10
Inside the system	12
Locating the information tag of your system	14
System Information Label	15
Initial system setup and configuration	18
Setting up your system	18
iDRAC configuration	18
Options to set up iDRAC IP address	18
Log in to iDRAC	19
Options to install the operating system	19
Methods to download firmware and drivers	19
Downloading drivers and firmware	20
Pre-operating system management applications	21
Options to manage the pre-operating system applications	21
System Setup	21
Viewing System Setup	21
System Setup details	22
System BIOS	22
Viewing System BIOS	22
System BIOS Settings details	22
System Information	23
Viewing System Information	23
System Information details	23
Memory Settings	24
Viewing Memory Settings	24
Memory Settings details	24
Processor Settings	25
Viewing Processor Settings	25
Processor Settings details	25
SATA Settings	27
Viewing SATA Settings	27
SATA Settings details	27
Boot Settings	28
Viewing Boot Settings	28
Boot Settings details	28
Choosing system boot mode	29
Changing boot order	29
Network Settings	29
Viewing Network Settings	30
Network Settings screen details	30
Integrated Devices	31
Viewing Integrated Devices	31
Integrated Devices details	31
Serial Communication	34
Viewing Serial Communication	34
Serial Communication details	34
System Profile Settings	35
Viewing System Profile Settings	35
System Profile Settings details	35
System Security	36
Viewing System Security	36
System Security Settings details	37
Creating a system and setup password	39
Using your system password to secure the system	39
Deleting or changing system and setup password	40
Operating with setup password enabled	40
Redundant OS Control	41
Viewing Redundant OS Control	41
Redundant OS Control screen details	41
Miscellaneous Settings	42
Viewing Miscellaneous Settings	42
Miscellaneous Settings details	42
iDRAC Settings utility	42
Device Settings	43
Dell Lifecycle Controller	43
Embedded system management	43
Boot Manager	43
Viewing Boot Manager	43
Boot Manager main menu	43
One-shot UEFI boot menu	44
System Utilities	44
PXE boot	44
Installing and removing system components	45
Safety instructions	45
Before working inside your system	46
After working inside your system	46
Recommended tools	46
Front bezel	47
Removing the front bezel	47
Installing the front bezel	47
System cover	48
Removing the system cover	48
Installing the system cover	49
Air shroud	51
Removing the air shroud	51
Installing the air shroud	52
Internal PERC riser	54
Removing the internal PERC riser	54
Installing the internal PERC riser	55
Removing the PERC card from the internal PERC riser	57
Installing PERC card into the internal PERC riser	58
Cooling fans	59
Removing the cooling fan	59
Installing cooling fan	61
Intrusion switch	63
Removing the intrusion switch	63
Installing the intrusion switch	64
Drive bay	65
Opening the drive bays	65
Closing the drive bays	66
Drives	66
Removing a drive blank	66
Installing a drive blank	67
Removing a drive carrier	68
Removing the drive from the drive carrier	69
Installing a drive carrier	69
Installing a drive into the drive carrier	70
Removing a 2.5-inch drive from a 3.5-inch drive adapter	71
Installing a 2.5-inch drive into a 3.5-inch drive adapter	72
Removing a 3.5-inch drive adapter from a 3.5-inch drive carrier	73
Installing a 3.5-inch drive adapter into the 3.5-inch drive carrier	74
Drive backplane bracket	75
Removing the drive bay 1 backplane bracket	75
Installing the drive bay 1 backplane bracket	76
Removing the drive bay 2 backplane brackets	77
Installing the drive bay 2 backplane brackets	78
Bay intrusion switch	79
Removing bay intrusion switch	79
Installing bay intrusion switch	80
Rear drive cage	81
Removing the rear drive cage	81
Installing the rear drive cage	82
Drive backplane	83
Drive backplane guidelines	83
Removing the drive bay 1 backplane	84
Installing the drive bay 1 backplane	85
Removing the drive bay 2 backplane	86
Installing the drive bay 2 backplane	88
Removing the rear drive backplane	89
Installing the rear drive backplane	90
Cable routing	91
System memory	92
System memory guidelines	92
General memory module installation guidelines	93
Mode-specific guidelines	94
Removing a memory module	96
Installing a memory module	97
Processor and heat sink	98
Removing a processor and heat sink module	98
Removing the processor	99
Installing the processor	101
Installing a processor and heat sink module	103
Expansion cards and expansion card risers	105
Expansion card installation guidelines	105
Removing expansion card from the system board	107
Removing expansion card from the expansion card riser	109
Installing expansion card into the expansion card riser	113
Installing expansion card on the system board	116
Removing an expansion card riser	118
Installing an expansion card riser	121
M.2 SSD module	123
Removing the M.2 SSD module	123
Installing the M.2 SSD module	124
Optional IDSDM / vFlash module	125
Removing the IDSDM/vFlash module	125
Installing IDSDM/vFlash module	126
Removing the MicroSD card	127
Installing the MicroSD card	128
LOM riser card	129
Removing the LOM riser card	129
Installing the LOM riser card	130
System battery	131
Replacing the system battery	131
Optional internal USB memory key	133
Replacing the optional internal USB memory key	133
Power supply units	134
Hot spare feature	134
Removing a power supply unit blank	134
Installing a power supply unit blank	135
Removing a power supply unit	135
Installing a power supply unit	136
Removing a DC power supply unit	137
Installing DC power supply unit	138
Power interposer board	138
Removing power interposer board	138
Installing power interposer board	139
System board	140
Removing the system board	140
Installing the system board	142
Restoring the system using Easy Restore	144
Manually update the Service Tag	144
Trusted Platform Module	144
Upgrading the Trusted Platform Module	144
Removing the TPM	145
Installing the TPM	145
Initializing TPM for BitLocker users	146
Initializing the TPM 1.2 for TXT users	146
Initializing the TPM 2.0 for TXT users	146
Cable chain assembly	147
Removing cable chain assembly	147
Installing the cable chain assembly	150
Control panel	154
Removing the left control panel	154
Installing the left control panel	155
Removing the right control panel	156
Installing the right control panel	158
Jumpers and connectors	160
System board connectors	160
System board jumper settings	161
Disabling forgotten password	162
Technical specifications	163
Chassis dimensions	163
System weight	164
Processor specifications	164
Supported operating systems	164
PSU specifications	164
Cooling fans specifications	165
System battery specifications	165
PCIe Expansion card riser specifications	165
Memory specifications	166
Storage controller specifications	166
Drives	167
Ports and connectors specifications	167
USB ports specifications	167
NIC ports specifications	167
Serial connector specifications	167
VGA ports specifications	168
IDSDM module	168
Video specifications	168
Environmental specifications	168
Standard operating temperature	170
Thermal restrictions	170
Particulate and gaseous contamination specifications	171
System diagnostics and indicator codes	173
System health and system ID indicator codes	173
iDRAC Direct LED indicator codes	174
NIC indicator codes	174
Power supply unit indicator codes	175
Drive indicator codes	177
System diagnostics	177
Dell Embedded System Diagnostics	177
Running the Embedded System Diagnostics from Boot Manager	178
Running the Embedded System Diagnostics from the Dell Lifecycle Controller	178
System diagnostic controls	178
Getting help	179
Recycling or End-of-Life service information	179
Contacting Dell	179
Accessing system information by using QRL	179
Quick Resource Locator for Dell EMC PowerEdge R740xd2 system	180
Receiving automated support with SupportAssist	180

Match case Limit results 1 per page

Option

Description

Maximum data rate indicates that the BIOS runs the communication links at the maximum frequency supported by

the processors. You can also select specific frequencies that the processors support, which can vary.

For best performance, you should select

Maximum data rate

. Any reduction in the communication link frequency

affects the performance of non-local memory accesses and cache coherency traffic. In addition, it can slow

access to non-local I/O devices from a particular CPU.

However, if power saving considerations outweigh performance, you might want to reduce the frequency of the

CPU communication links. If you do this, you should localize memory and I/O accesses to the nearest NUMA node

to minimize the impact to system performance.

Virtualization

Technology

Enables or disables the virtualization technology for the processor. This option is set to

Enabled

by default.

Adjacent Cache

Line Prefetch

Optimizes the system for applications that need high utilization of sequential memory access. This option is set to

Enabled

by default. You can disable this option for applications that need high utilization of random memory

access.

Hardware

Prefetcher

Enables or disables the hardware prefetcher. This option is set to

Enabled

by default.

Software

Prefetcher

Enables or disables the software prefetcher. This option is set to

Enabled

by default.

DCU Streamer

Prefetcher

Enables or disables the Data Cache Unit (DCU) streamer prefetcher. This option is set to

Enabled

by default.

DCU IP Prefetcher

Enables or disables the Data Cache Unit (DCU) IP prefetcher. This option is set to

Enabled

by default.

Sub NUMA Cluster

Enables or disables the Sub NUMA Cluster. This option is set to

Disabled

by default.

UPI Prefetch

Enables you to get the memory read started early on DDR bus. The Ultra Path Interconnect (UPI) Rx path will

spawn the speculative memory read to Integrated Memory Controller (iMC) directly. This option is set to

Enabled

by default.

LLC Prefetch

Enables or disables the LLC Prefetch on all threads. This option is set to

Disabled

by default.

Dead Line LLC

Alloc

When enabled, it opportunistically fill dead lines in LLC. When disabled, it never fill dead lines in LLC. This option is

set to

Enabled

by default.

Directory AtoS

AtoS optimization reduces remote read latencies for repeat read accesses without intervening writes. This option

is set to

Disabled

by default.

Logical Processor

Idling

Enables you to improve the energy efficiency of a system. It uses the operating system core parking algorithm and

parks some of the logical processors in the system which in turn allows the corresponding processor cores to

transition into a lower power idle state. This option can only be enabled if the operating system supports it. It is set

Disabled

by default.

Configurable TDP

Enables you to configure the TDP level. The available options are

Nominal

Level 1

, and

Level 2

. This option is set

Nominal

by default.

NOTE:

This option is only available on certain stock keeping units (SKUs) of the processors.

x2APIC Mode

Enables or disables the x2APIC mode. This option is set to

Enabled

by default.

Number of Cores

per Processor

Controls the number of enabled cores in each processor. This option is set to

All

by default.

Processor Core

Speed

Specifies the maximum core frequency of the processor.

Processor Bus

Speed

Displays the bus speed of the processor.

Processor n

The following settings are displayed for each processor installed in the system:

Option

Description

Family-Model-

Stepping

Specifies the family, model, and stepping of the processor as defined by Intel.

Pre-operating system management applications