Datasheet
Summary Tables of Changes
14 Specification Update
Stepping
Stepping
Number
A1 E1
Plans ERRATA
AR41
X
Fixed Concurrent Multi-processor Writes to Non-dirty Page May Result in
Unpredictable Behavior
AR42
X
Fixed Performance Monitor IDLE_DURING_DIV (18h) Count May Not Be
Accurate
AR43 X X No Fix Values for LBR/BTS/BTM Will Be Incorrect after an Exit from SMM
AR44
X
Fixed SYSCALL Immediately after Changing EFLAGS.TF May Not Behave
According to the New EFLAGS.TF
AR45
X X
No Fix VM Bit Is Cleared on Second Fault Handled by Task Switch from
Virtual-8086 (VM86)
AR46 X Fixed IA32_FMASK Is Reset during an INIT
AR47
X X
No Fix Code Breakpoint May Be Taken after POP SS Instruction If It Is
followed by an Instruction That Faults
AR48
X X
No Fix Last Branch Records (LBR) Updates May Be Incorrect after a Task
Switch
AR49 X X No Fix IO_SMI Indication in SMRAM State Save Area May Be Set Incorrectly
AR50 X X No Fix INIT Does Not Clear Global Entries in the TLB
AR51
X
Fixed Using Memory Type Aliasing with Memory Types WB/WT May Lead to
Unpredictable Behavior
AR52
X
Fixed Update of Read/Write (R/W) or User/Supervisor (U/S) or Present (P)
Bits without TLB Shootdown May Cause Unexpected Processor
Behavior
AR53 X Fixed BTS Message May Be Lost When the STPCLK# Signal Is Active
AR54 X X No Fix MOV To/From Debug Registers Causes Debug Exception
AR55
X X
No Fix EFLAGS Discrepancy on a Page Fault after a Multiprocessor TLB
Shootdown
AR56
X X
No Fix LBR, BTS, BTM May Report a Wrong Address when an
Exception/Interrupt Occurs in 64-bit Mode
AR57
X X
No Fix A Thermal Interrupt Is Not Generated when the Current Temperature
Is Invalid
AR58
X X
No Fix CMPSB, LODSB, or SCASB in 64-bit Mode with Count Greater or Equal
to 2
48
May Terminate Early
AR59
X X
No Fix Returning to Real Mode from SMM with EFLAGS.VM Set May Result in
Unpredictable System Behavior
AR60
X X
No Fix IRET under Certain Conditions May Cause an Unexpected Alignment
Check Exception
AR61 X X No Fix Performance Monitoring Event FP_ASSIST May Not Be Accurate
AR62
X
Fixed CPL-Qualified BTS May Report Incorrect Branch-From Instruction
Address
AR63 X Fixed PEBS Does Not Always Differentiate Between CPL-Qualified Events