Charlie
Thu Nov 08 16:49:21 PST 2007
You should be able to find the stepping of your CPUs. Various utilities will
report it. I'd start
here...
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_9033,00.html
--
Charlie.
http://msmvps.com/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel
"bret" <bret@discussions.microsoft.com> wrote in message
news:FE6FC1FA-7824-46C8-92C5-1F7307FE6049@microsoft.com...
> Thanks for the help.
>
> I actually had the BIOS updated to the latest version (which includes a
> fix
> for the memory hole)
>
> After posting the last reply, I had another look around the BIOS. I found
> that the memory hole option only allows you to choose "software" or
> disabled", so I assume "disabled" means hardware mapping. I also found the
> MTRR option and the instructions suggest that continuous is for 4gb+ so I
> changed that to continuous.
>
> I have seen fewer crashes than before with MTRR on continuous.
>
> After some more forum digging I found an article that states the Opteron's
> compatibility with Hardware / Software memory mapping. It states that
> Opterons with certain stepping (older models) only support software
> mapping.
> I cannot find the exact model part number for my CPU's (as they are under
> the
> heat sink) but It seems I have an older model, because when software
> mapping
> is disabled I cannot see over 4gb in windows.
>
> Are my assumptions correct or should I be looking elsewhere?
>
>
> "Charlie Russel - MVP" wrote:
>
>> Tyan BIOSs have often had some issues with this. I'd look for an updated
>> BIOS from them for a start. This isn't Windows fault, I have to say. Many
>> of
>> us here are happily running >4GB of RAM on 64-bit Windows. I'm doing it
>> on
>> everything from a jumped up ASUS mobo with 6GB (2x2048 + 2x1024) and an
>> old
>> D930 processor to a dual Xeon 5130 with 16 GB of RAM in an HP ML350 to a
>> dual Xeon 5350 (quad core) with 16 GB on an HP DL380. OS's have been
>> everything from XP x64 to Longhorn RC0 Enterprise.
>>
>> --
>> Charlie.
>>
http://msmvps.com/xperts64
>>
http://mvp.support.microsoft.com/profile/charlie.russel
>>
>>
>> "bret" <bret@discussions.microsoft.com> wrote in message
>> news:E7205A6D-39A8-4C38-B86E-685B3FCC04B4@microsoft.com...
>> >I activated the "memory hole" in the BIOS, now my computer starts up
>> >with a
>> > report of 7128 MB of RAM and then switches to 5120 MB. Windows Boots
>> > fine
>> > (though a lot longer, about a minute) and reports 5120 MB. My problem
>> > seems
>> > fixed. Now windows gives me a BSOD (Blue Screen Deat) at random times
>> > (with
>> > random software, with an error in " MEMORY_MANAGEMENT"
>> >
>> >
>> > Normally I would expect strange things with new RAM. However, I
>> > started
>> > with 1024MB RAM in my computer then added 2x1024 sticks, with no
>> > problems
>> > and
>> > windows reported 3072 MB correctly, booted normally and never crashed
>> > on a
>> > BSOD. Months later, I then bought the exact same RAM again (2x1024MB
>> > from
>> > same manufacturer with same part #) Thus totaling a 4x1024MB upgrade.
>> >
>> >
>> > So basically, with the BIOS change, (seemingly the only way for windows
>> > to
>> > recognize over 4096MB) Windows crashes periodically, Takes forever to
>> > boot
>> > and is generally unstable.
>> >
>> > Here are my specs, maybe this will help
>> >
>> > Tyan Thunder K8W S2885
>> > AMD Opteron 250 x2
>> > Quadro FX 3000
>> > cpu1
>> > 2x1024MB Crucial DDR 3200 REG ECC Dual Channel
>> > 2x1024MB Crucial DDR 3200 REG ECC Dual Channel
>> > cpu2
>> > 2x256MB OCZ DDR 3200 REG ECC Dual Channel
>> > 2x256MB OCZ DDR 3200 REG ECC Dual Channel
>> > 4x Hard Drives
>> > 2x DVD Drives
>> >
>> > "Charlie Russel - MVP" wrote:
>> >
>> >> Sounds like your BIOS needs to do some address rearranging. The
>> >> problem
>> >> is
>> >> that various cards and components reserve addresses in the range
>> >> between
>> >> 3GB
>> >> and 4GB of memory address space. This is to support 32-bit Windows
>> >> which
>> >> is
>> >> limited 4 GB of memory address space under a normal flat memory model.
>> >> When
>> >> you run 64-bit Windows, that flat memory model is 16 TB of memory
>> >> address
>> >> space. But meanwhile, you've still got cards and components hiding
>> >> your
>> >> RAM
>> >> because they have priority over those addresses in the first 4 GB. The
>> >> BIOS
>> >> can remap memory addresses to handle this and free up your extra RAM,
>> >> but
>> >> you need to enable that in the BIOS. It's called different things in
>> >> different mfg's BIOS, but poke around a bit and you should find it.
>> >>
>> >> --
>> >> Charlie.
>> >>
http://msmvps.com/xperts64
>> >>
http://mvp.support.microsoft.com/profile/charlie.russel
>> >>
>> >>
>> >> "bret" <bret@discussions.microsoft.com> wrote in message
>> >> news:09F2537E-A6F0-4530-9C3D-E4B1D6481CF7@microsoft.com...
>> >> >I have been using Vista Ultimate 64 since release with no problems.
>> >> >I
>> >> > upgraded from my 1gb of ram to 5gb total. Adding 4x1gb sticks. At
>> >> > boot
>> >> > the
>> >> > mobo recognizes 5120 mb of RAM. But Vista only reports 3967mb? I've
>> >> > checked
>> >> > all the ram and it works fine.
>> >> >
>> >> > I thought Ultimate 64 supported 128gb?
>> >> >
>> >> > Does anyone know how i might fix this,
>> >> >
>> >>
>>