Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
183
Datasheet Volume Two: Functional Description, February 2014
Processor Uncore Configuration Registers
13.7.4.4
CAPID2
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 
Type:
CFG
PortID: N/A
Bus:
1
Device: 10
Function:
3
Offset:
0x88
Bit
Attr
Default
Description
Type:
CFG
PortID: N/A
Bus:
1
Device: 10
Function:
3
Offset:
0x8c
Bit
Attr
Default
Description
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
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