Datasheet
Summary Tables of Changes
Specification Update 31
Number
Stepping
Stepping
Stepping
Plans
ERRATA
E-1
M-1
G-2
AH39
Fixed
Cache Data Access Request from One Core Hitting a Modified Line
in the L1 Data Cache of the Other Core May Cause Unpredictable
System Behavior
AH40
Fixed
PREFETCHh Instruction Execution under Some Conditions May
Lead to Processor Livelock
AH41
Fixed
PREFETCHh Instructions May Not Be Executed when Alignment
Check (AC) Is Enabled
AH42
Fixed
Upper 32 Bits of the FPU Data (Operand) Pointer in the FXSAVE
Memory Image May Be Unexpectedly All 1‟s after FXSAVE
AH43
Fixed
Concurrent Multi-processor Writes to Non-dirty Page May Result in
Unpredictable Behavior
AH44
Fixed
Performance Monitor IDLE_DURING_DIV (18h) Count May Not Be
Accurate
AH45
X
X
X
No Fix
Values for LBR/BTS/BTM Will Be Incorrect after an Exit from SMM
AH46
X
X
X
No Fix
Shutdown Condition May Disable Non-Bootstrap Processors
AH47
Fixed
SYSCALL Immediately after Changing EFLAGS.TF May Not Behave
According to the New EFLAGS.TF
AH48
X
X
X
No Fix
Code Segment Limit/Canonical Faults on RSM May be Serviced
before Higher Priority Interrupts/Exceptions and May Push the
Wrong Address Onto the Stack
AH49
X
X
X
No Fix
VM Bit Is Cleared on Second Fault Handled by Task Switch from
Virtual-8086 (VM86)
AH50
Fixed
IA32_FMASK Is Reset during an INIT
AH51
X
X
X
No Fix
An Enabled Debug Breakpoint or Single Step Trap May Be Taken
after MOV SS/POP SS Instruction if it is Followed by an Instruction
That Signals a Floating Point Exception
AH52
X
X
X
No Fix
Last Branch Records (LBR) Updates May Be Incorrect after a Task
Switch
AH53
X
X
X
No Fix
IO_SMI Indication in SMRAM State Save Area May Be Set
Incorrectly
AH54
X
X
X
No Fix
INIT Does Not Clear Global Entries in the TLB
AH55
Fixed
Using Memory Type Aliasing with Memory Types WB/WT May Lead
to Unpredictable Behavior
AH56
Fixed
Update of Read/Write (R/W) or User/Supervisor (U/S) or Present
(P) Bits without TLB Shootdown May Cause Unexpected Processor
Behavior
AH57
Fixed
BTS Message May Be Lost When the STPCLK# Signal Is Active
AH58
X
X
X
No Fix
MOV To/From Debug Registers Causes Debug Exception
AH59
X
X
X
No Fix
EFLAGS Discrepancy on a Page Fault after a Multiprocessor TLB
Shootdown