Intel E7-8891 v2 CM8063601377422 User Manual

Intel

®

 Xeon

® 

Processor E7-2800/4800/8800 v2 Product Family

183

Datasheet Volume Two: Functional Description, February 2014

This register is a Capability Register used to expose enable/disable for BIOS use.

7:7

RO_FW

0x0

X2APIC_EN:

Enable Extended APIC support.
When set the enables the support of x2APIC (Extended APIC) in the core and 

uncore. The being set will impact:
 a. CPUID indication x2APIC support
 b. CPU ability to enable x2APIC support
 c. Uncore ability to generate and send x2APIC messages.

6:6

RO_FW

0x0

CPU_HOT_ADD_EN:

Intel

®

TXT - ENABLE CPU HOT ADD 

5:5

RO_FW

0x0

PWRBITS_DIS:

0b Power features activated during reset
 1b Power features (especially clock gating) are not activated

4:4

RO_FW

0x0

GV3_DIS:

Disable GV3. Does not allow for the writing of the IA32_PERF_CONTROL 

register in order to change ratios

3:2

RO_FW

0x0

PPPE:

PPPE_ENABLE 

1:1

RO_FW

0x0

CORE_RAS_EN:

Enable Data Poisoning, MCA recovery

0:0

RO_FW

0x0

DCA_EN:

DCA Enable 

31:31

RO_FW

0x0

QPI_SPARE:

30:30

RO_FW

0x0

QPI_LINK2_DIS:

When set Intel

®

QPI link 2 will be disabled.

29:25

RO_FW

0x0

QPI_ALLOWED_CFCLK_RATIO_DIS:

Allowed CFCLK ratio is 12,11,10,9, 8 (default),7; One bit is allocated for each 

supported ratio except 8, the default ratio. Intel

®

QPI transfer rate = 8 * 

CFCLK. Bits are organized as r12_r11_r10_r9_r7 format. 0/1 --> ratio 

supported/not supported. Default ratio of 8 is always supported, hence can not 

be disabled. Ex: 00000 ==> Supported ratio: 12,11,10,9,8 (default),7; ratio 

not supported:
none 00001 ==> Supported ratio: 12,11,10,9,8 (default); ratio not supported: 

7
........ 11111  ==> Supported ratio: 8 (default); ratio not supported: 

12,11,10,9,7