Specification Update


Intel
®
Core
™
i5-600, i3-500 Desktop Processor Series and
Intel
®
Pentium Desktop Processor 6000 Series
November 2014 Specification Update
Document Number: 322911-021US 49
AAU106. USB Devices May Not Function Properly With Integrated Graphics
While Running Targeted Stress Graphics Workloads With Non-
Matching Memory Configurations
Problem: When the integrated graphics engine continuously generates a large stream of writes to
system memory, and Intel Flex Memory Technology is enabled, with a different amount
of memory in each channel, the memory arbiter may temporarily stop servicing other
device-initiated traffic. In some cases this can cause certain USB devices, such as
keyboard and mouse, to become unresponsive. Intel has only observed this erratum
with targeted stress content. This erratum is not seen when the platform is configured
with single channel or dual channel symmetric memory and is not dependent on the
memory frequency.
Implication: Due to this erratum, certain USB devices may become unresponsive.
Workaround: None identified.
Status: For the steppings affected, see the Summary Tables of Changes.
AAU107. VM Entry May Omit Consistency Checks Related to Bit 14 (BS) of the
Pending Debug Exception Field in Guest-State Area of the VMCS
Problem: Section “Checks on Guest Non-Register State” of Volume 3B specifies consistency
checks that VM entry should perform for bit 14 (BS, indicating a pending single-step
exception) of the pending debug exception field in guest-state area of the VMCS. These
checks enforce the consistency of that bit with other fields in the guest-state area. Due
to this erratum, VM entry may fail to perform these checks.
Implication: A logical processor may enter VMX non-root operation with a pending single-step
debug exception that not consistent other register state; this may result in unexpected
behavior. Intel has not observed this erratum with any commercially available software.
Workaround: When using VMWRITE to write to a field in the guest-state area, software should ensure
that the value written is consistent with the state of other guest-state fields.
Status: For the steppings affected, see the Summary Tables of Changes.
AAU108. Intel Turbo Boost Technology Ratio Changes May Cause Unpredictable
System Behavior
Problem: When Intel Turbo Boost Technology is enabled as determined by the
TURBO_MODE_DISABLE bit being “0” in the IA32_MISC_ENABLES MSR (1A0H), the
process of locking to new ratio may cause the processor to run with incorrect ratio
settings. The result of this erratum may be unpredictable system behavior.
Implication: Due to this erratum, unpredictable system behavior may be observed.
Workaround: It is possible for the BIOS to contain a workaround for this erratum.
Status: For the steppings affected, see the Summary Tables of Changes.