back to article Intel releases Core 2 chip Bios fix

Intel has released a BIOS patch for Windows machines running Core 2 and Xeon 3000/5000 chips that addresses potential unpredictable system behavior. The update is recommended for users running an Intel Core2 Duo E4000 and E6000, Intel Core2 Quad Q6600, Intel Core2 Extreme X6800 and QX6700, Dual-COre Intel Xeon 5100 and Quad- …


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  1. Anonymous Coward
    Anonymous Coward

    Validation Blues

    I tried to download the M$oft update for 32-bit Windows XP Pro. They wanted several levels of validation, and also required that I permanently install a "GenuineAdvantage" code module. Turns out, my copy of XP is a "volume key" product. Upgrades are not permitted. I must pay approx US$145 in order to obtain a new key with upgrade potential from M$oft. In other words, as a Windows user, I cannot repair my Intel bug without first sending-off US$145 to M$oft. BTW, shouldn't this be considered a "material & workmanship" issue? Shouldn't Intel be req'd to pay M$oft for the corrective work? Where are the accursed class-action attys when I really need one? Keep a weather eye open for my Core Duo motherboard and processor on Ebay. I've just decided to replace my system with a dual Opteron box. Running Red Hat.

  2. Greg Nelson

    Other Concerns

    From an OpenBSD mailing list:

    From View message header detail Theo de Raadt

    Sent Wednesday, June 27, 2007 10:08 am




    Subject Intel Core 2

    Various developers are busy implimenting workarounds for serious bugs

    in Intel's Core 2 cpu.

    These processors are buggy as hell, and some of these bugs don't just

    cause development/debugging problems, but will *ASSUREDLY* be

    exploitable from userland code.

    As is typical, BIOS vendors will be very late providing workarounds /

    fixes for these processors bugs. Some bugs are unfixable and cannot

    be worked around. Intel only provides detailed fixes to BIOS vendors

    and large operating system groups. Open Source operating systems are

    largely left in the cold.

    Full (current) errata from Intel:

    - We bet there are many more errata not yet announced -- every month

    this file gets larger.

    - Intel understates the impact of these erraata very significantly.

    Almost all operating systems will run into these bugs.

    - Basically the MMU simply does not operate as specified/implimented

    in previous generations of x86 hardware. It is not just buggy, but

    Intel has gone further and defined "new ways to handle page tables"

    (see page 58).

    - Some of these bugs are along the lines of "buffer overflow"; where

    a write-protect or non-execute bit for a page table entry is ignored.

    Others are floating point instruction non-coherencies, or memory

    corruptions -- outside of the range of permitted writing for the

    process -- running common instruction sequences.

    - All of this is just unbelievable to many of us.

    An easier summary document for some people to read:

    Note that some errata like AI65, AI79, AI43, AI39, AI90, AI99 scare

    the hell out of us. Some of these are things that cannot be fixed in

    running code, and some are things that every operating system will do

    until about mid-2008, because that is how the MMU has always been

    managed on all generations of Intel/AMD/whoeverelse hardware. Now

    Intel is telling people to manage the MMU's TLB flushes in a new and

    different way. Yet even if we do so, some of the errata listed are

    unaffected by doing so.

    As I said before, hiding in this list are 20-30 bugs that cannot be

    worked around by operating systems, and will be potentially

    exploitable. I would bet a lot of money that at least 2-3 of them


    For instance, AI90 is exploitable on some operating systems (but not

    OpenBSD running default binaries).

    At this time, I cannot recommend purchase of any machines based on the

    Intel Core 2 until these issues are dealt with (which I suspect will

    take more than a year). Intel must be come more transparent.

    (While here, I would like to say that AMD is becoming less helpful day

    by day towards open source operating systems too, perhaps because

    their serious errata lists are growing rapidly too).

  3. Brian

    RE Validation blues

    So your complaining cos u cant update your dodgey copy of XP to fix a problem that isn't even effecting u ? U have lost the plot mate. And people who write microsoft with a $ are sad. U dont even have to down load the patch from microsoft. Good luck with Red Hat.

  4. Anonymous Coward
    Anonymous Coward

    Funnily enough...

    ...I just put my new PC together and have been having pretty random problems with it. Random restarts and lockups were happening every half hour and errors in the event log seemed to indicate that it was a problem with page files. Interesting when something like this comes along just as you were scratching your head as to what was going on.

  5. Alan Donaly

    OS will survive

    My mobo will be an intel let them patch it

    I will then use it the same as always if they do

    it's a little silly to worry about these things in

    advance they simply have to be fixed download

    the latest bios and flash it to bios chip my current

    computer has had six revisions I never paid for any

    of them but I got them just the same. No it's never

    easy for the kernel guys to work around all the

    stupid errata but they will anyway.

  6. Daniel

    That's annoying...

    Explains my random issues. Couldn't figure out why my vista box would not shutdown after some specific assembler code I worked on (involving a lot of "official" cpu code, page swaps and dma). I even loaded up fedora and it'd cause lovely spinlocks (just as annoying as a vista lockup, less that CPU)

  7. Anonymous Coward
    Anonymous Coward

    I've checked the errata...

    Most of the time, it only effects 64 bit oses, because the PIII's extended microcode is what causes the bugs. If your os always align all memory access (linux and windows compilers do that by default), then the page and cache coherency problems won't be a real problem. The fpu should be left untouched in 64 bit mode or it's state saved by hand, this is why the new windows vista just dropped support for it altogether, but in linux it might be a problem. The third group of problems come from the msr/debug register/performance counter range which only disturbs those who want to actually debug something on the system, not those who just run the software.

    Btw, it would be better to just turn off all the damaged subsystems and sell these cpus as normal 32 bit only core 2 duo-s where most of the problems would never surface. Fortunately, the rest of the intel cpus are not effected and users running the 32 bit versions of their os of choice won't see much difference at all. (for these cpus, it's better to stick to using winxp with no more than 2Gb of ram and the problems just disappear)

  8. Tom

    c2d ramdom restarts

    i thort my computer was overheating when it was left at full load for a few minutes and randomly restarting, now i think it could be this problem. i have an e6750 engineering sample and there must be a reason as to why intel havent gone into full production with them. other than that my comp goes like stink its a c2d at 3.3ghz with an fsb of 1650mhz, 3gigs of 1ghz mem, two 8800 gts in sli all in an asus striker extreme :) not bad for someone who doesnt have a job lol

  9. Nick Knupffer

    Intel's reply

    I am from Intel, and I thought I would give you our perspective. Months ago, we addressed a processor issue by providing a BIOS update for our customers that in no way affects system performance. We publicly documented this as an erratum in April. All processors from all companies have errata, and Intel has a well-known errata communication process to inform our customers and the public. Keep in mind the probability of encountering this issue is low. Specification Updates for the affected processors are available at We feel we’ve resolved the issue and were open about it with customers and then publicly publishing it, but this is a good venue for ideas on how we could do better or more. I am interested in any constructive comments...

  10. Chris Pasiuk

    RE: Funnily enough...

    Clock down the processor by .001 Ghz. Been reading plenty on the OC community and for some wonderful reason, Core 2's don't like even numbers. My E6420 runs at 3.199Ghz in most cases. However, from what others here have been saying, if you're running a 64bit OS, than go get it. It's explaining the random but not unrecoverable exception errors I've been running into running x64.

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