"Intel has provided a microcode update to HP as a critical software fix. This Intel microcode update addresses an improper Translation Lookaside Buffer (TLB) invalidation that may result in unpredictable system behavior such as system hangs or incorrect data. HP is making available a system BIOS upgrade that integrates a new version of this Intel microcode to address this potential but extremely rare issue. While the occurrence of this issue is extremely rare, HP strongly recommends upgrading the system BIOS to a version listed in the RESOLUTION section (or later). Intel has indicated that the microcode update has no known measurable performance impact and provides a complete and comprehensive resolution to this issue.
IMPORTANT : This condition is NOT specific to HP xw4400, xw6400, xw8400 Workstations or HP Proliant xw460c Blade Workstation, and can affect any workstation that uses Intel Core2 Duo desktop processor E4000 and E6000 sequences, Intel Core2 Quad desktop processor Q6600 and Intel Core2 Extreme processors X6800 and QX6700 processors. It is not restricted to HP systems and can occur on other manufacturers’ Intel-based systems."
You can read about it here.
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