Intel CORE I7-900 DEKSTOP - SPECIFICATION Specification page 52

If the "virtualize x2APIC mode" VM-execution control is 1, an attempt to write
Problem:
to the IA32_EXT_XAPIC_TPR MSR (808H) using the WRMSR instruction
should cause a trap-like VM exit if it reduces the value of the TPR shadow
below that of the TPR threshold VM-execution control field. Due to this
erratum, such a VM exit may fail to occur when specified. In addition, such a
VM exit may occur even if the TPR shadow is not reduced below the TPR
threshold.
Implication: Failure to cause the specified VM exits may prevent a virtual-
machine monitor (VMM) from delivering virtual interrupts in a timely manner.
Generation of incorrect VM exits may cause a VMM to deliver virtual interrupts
to a guest prematurely.
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:
AAJ100. Back to Back Uncorrected Machine Check Errors May Overwrite
IA32_MC3_STATUS.MSCOD
When back-to-back uncorrected machine check errors occur that would both
Problem:
be logged in the IA32_MC3_STATUS MSR (40CH), the
IA32_MC3_STATUS.MSCOD (bits [31:16]) field may reflect the status of the
most recent error and not the first error. The rest of the IA32_MC3_STATUS
MSR contains the information from the first error.
Implication: Software should not rely on the value of
IA32_MC3_STATUS.MSCOD if IA32_MC3_STATUS.OVER (bit [62]) is set.
Workaround: None identified.
For the steppings affected, see the Summary Table of Changes.
Status:
AAJ101. Memory Intensive Workloads with Core C6 Transitions May Cause
System Hang
Under a complex set of internal conditions, a system running a high cache
Problem:
stress and I/O workload combined with the presence of frequent core C6
transitions may result in a system hang.
Implication: Due to this erratum, the system may hang.
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:
AAJ102. Corrected Errors With a Yellow Error Indication May be Overwritten by
Other Corrected Errors
A corrected cache hierarchy data or tag error that is reported with
Problem:
IA32_MCi_STATUS.MCACOD (bits [15:0]) with value of
Errata
®
Intel Core™ i7 processor
Specification Update