Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU Specification page 30

AA41. VMLAUNCH/VMRESUME May Not Fail when VMCS is Programmed to
Cause VM Exit to Return to a Different Mode
VMLAUNCH/VMRESUME instructions may not fail if the value of the "host
Problem:
address-space size" VM-exit control differs from the setting of
IA32_EFER.LMA.
Implication: Programming the VMCS to allow the monitor to be in different modes prior to
VMLAUNCH/VMRESUME and after VM-exit may result in undefined behavior.
Workaround: Software should ensure that "host address-space size" VM-exit control has
the same value as IA32_EFER.LMA at the time of VMLAUNCH/VMRESUME.
For the steppings affected, see the Summary Tables of Changes.
Status:
AA42. A Continuous Loop Executing Bus Lock Transactions on One Logical
Processor may Prevent Another Logical Processor from Acquiring
Resources
In a system supporting Hyper-Threading Technology, when one hardware
Problem:
thread is in a continuous loop executing bus locks plus other traffic, the other
hardware thread may be prevented from acquiring resources to also execute
a lock.
Implication: This erratum may cause system hang or unpredictable system behavior. This
erratum has not been observed with commercially available software.
Workaround: None identified.
For the steppings affected, see the Summary Tables of Changes.
Status:
AA43. An Unexpected Memory Access May be Issued During Execution of
the WRMSR Instruction Under Certain Conditions
The processor may generate an unexpected memory access during the
Problem:
WRMSR instruction under certain conditions.
Implication: When this erratum occurs, an unexpected read may be issued on FSB.
Subsequent side effects are dependent on platform operation and may
include a system hang. This erratum has not been observed on any
commercial operating system.
Workaround: It is possible for BIOS to contain a workaround for this erratum.
For the steppings affected, see the Summary Tables of Changes.
Status:
AA44. Combining Some Processors With Intel 945® Chipsets Can Lead to
Unpredictable System Behavior
Some processors with 800 MHz Front Side Bus (FSB), when used in
Problem:
combination with a motherboard based on the Intel 945® chipset, may
observe FSB bit errors which may result in unpredictable system behavior.
30
Errata
Specification Update