Intel CORE I7-900 DEKSTOP - SPECIFICATION Specification page 48

Workaround: Use destination shorthand of 10B or 11B to send broadcast IPIs.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ88. Faulting Executions of FXRSTOR May Update State Inconsistently
The state updated by a faulting FXRSTOR instruction may vary from one
Problem:
execution to another.
Implication: Software that relies on x87 state or SSE state following a faulting
execution of FXRSTOR may behave inconsistently.
Workaround: Software handling a fault on an execution of FXRSTOR can compensate for
execution variability by correcting the cause of the fault and executing
FXRSTOR again.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ89. Unexpected QPI Link Behavior May Occur When a CRC Error Happens
During L0s
When a QPI (Intel® QuickPath Interconnect) agent requests L0s entry while a
Problem:
CRC (Cyclic Redundancy Check) error occurs during this flit or on the flit just
before it, the requesting QPI agent may enter L0s and turn its drivers off.
During this time noise on the link may be interpreted as a QPI command by
the remote QPI agent, and may result in unexpected behavior.
Implication: Unexpected QPI link behavior may occur when CRC error
happens on or just before L0s entry request.
Workaround: Disable L0s.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ90. Performance Monitor Event EPT.EPDPE_MISS May be Counted While
EPT is Disabled
Performance monitor event EPT.EPDPE_MISS (Event: 4FH, Umask: 08H) is
Problem:
used to count Page Directory Pointer table misses while EPT (extended page
tables) is enabled. Due to this erratum, the processor will count Page
Directory Pointer table misses regardless of whether EPT is enabled or not.
Implication: Due to this erratum, performance monitor event
EPT.EPDPE_MISS may report counts higher than expected.
Workaround: Software should ensure this event is only enabled while in EPT mode.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ91. Performance Monitor Counters May Count Incorrectly
Errata
®
Intel Core™ i7 processor
Specification Update