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AMD official reply on TLB Erratum - TechAmok
AMD official reply on TLB Erratum - [hardware] 11:25 AM EST - Jan,15 2008 - post a comment As I reported last week,
AMD has fixed its
TLB issues in upcoming silicon. I'm still getting questioned on this, so
here is an official statement (thanks
HardOCP) on that direct from Damon Muzny at AMD PR.
The translation look-aside buffer (TLB) erratum number 298 is an L3 protocol
issue which can cause a system hang when running certain client workloads. As I
mentioned before, it is EXTREMELY unlikely your readers will be able to create a
work load that could trigger this erratum. With that said, AMD felt it prudent
to fix the erratum in BIOS immediately and in silicon going forward. This TLB
erratum has been addressed through a BIOS modification that was provided to our
industry partners in November. That BIOS modification was designed to address
the erratum and ensure system stability for customers. The chips that are
affected are the Phenom 9500 and 9600 processors, and AMD does not anticipate
that this erratum will affect any future AMD processors, as it will be fixed in
silicon. The BIOS fix does come with the potential for some performance
penalty, depending on software used; however, your readers will be able to
download the AMD Overdrive utility with the ability to turn OFF the TLB errata
fix and regain full performance. Enabling that switch in AMD Overdrive
demonstrates our confidence that this erratum should not be a concern among
desktop users. As I have said, though, we have tried to err solidly on the side
of caution with our actions and support.
Additionally, please note how the three "Turbo" button settings in AMD
OverDrive correlate regarding disabling the TLB erratum fix.
Green (top image) = Safe performance level (no TLB caching / default for B2
CPU)
Yellow (middle image) = Elevated performance level (TLB caching enabled TLB
erratum fix turned off)
Red (bottom image) = Highest performance level (TLB enabled + CPU pwr management
tweak enabled)
Note: the TLB erratum fix is disabled by moving above the Green / Safe
performance level done so at the user's discretion, of course.
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