Intel CORE I7-900 DEKSTOP - SPECIFICATION Specification page 39

Errata
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ60. The "Virtualize APIC Accesses" VM-Execution Control May be Ignored
If a VM exit occurs while the "virtualize APIC accesses" and "enable VPID"
Problem:
VM-execution controls are both 1 and the VM-exit MSR-store count is not 0,
the logical processor may operate as if the "virtualize APIC accesses" VM-
execution control was 0 following a subsequent VM entry.
Implication: This erratum may prevent VMM software from virtualizing
memory-mapped APIC accesses if it is using VPIDs (virtual-processor
identifiers) and is saving MSRs on VM exits.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ61. C6 Transitions May Cause Spurious Updates to the xAPIC Error Status
Register
If any of the LVT entries are not initialized, reads from xAPIC Error Status
Problem:
Register following a C6 transition may report a spurious illegal vector
received.
Implication: Due to this erratum, reads to xAPIC Error Status Register may
report illegal vector received when none was actually received.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ62. Critical ISOCH Traffic May Cause Unpredictable System Behavior
When Write Major Mode Enabled
Under a specific set of conditions, critical ISOCH (isochronous) traffic may
Problem:
cause unpredictable system behavior with write major mode enabled.
Implication: Due to this erratum unpredictable system behavior may occur.
Workaround: Write major mode must be disabled in the BIOS by writing the write major
mode threshold value to its maximum value of 1FH in ISOCHEXITTRESHOLD
bits [19:15], ISOCHENTRYTHRESHOLD bits [14:10], WMENTRYTHRESHOLD
bits [9:5], and WMEXITTHRESHOLD bits [4:0] of the
MC_CHANNEL_{0,1,2}_WAQ_PARAMS register.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ63. Running with Write Major Mode Disabled May Lead to a System Hang
With write major mode disabled, reads will be favored over writes and under
Problem:
certain circumstances this can lead to a system hang.
®
Intel Core™ i7 processor
Specification Update
39