Re: Useable RAM in XP Home or Pro

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Mak wrote:

> Sorry Ken, /3GB has nothing to do with physical memory (RAM), it
> affects only how virtual address space is split for given process.
> (virtual addressable space per process - 4GB (OS 32-bit)).
> I.E. no /3GB - 2GB for user mode / 2 GB for kernel. With /3GB - 3GB
> user mode / 1GB for kernel.


Doing further research on this, it appears that you are correct. Thanks for
the correction, and my apologies to the OP for the misinformation.

--
Ken Blake - Microsoft MVP Windows: Shell/User
Please reply to the newsgroup



> Doesn't matter how much RAM is installed,
> even if system has only 32MB RAM, the numbers are still the same.
> Only processes that have largeaddressspace flag on can benefit from
> using /3GB.
>
> To OP:
> WinXP 32-bit, is 'licensed' up to 4GB of RAM, no matter how much RAM
> you motherboard may support, however, because a lots of last gigabyte
> is reserved for PCI, in reality, you may see only somewhat around 3GB
> when you install 4GB or more. Using /PAE switch in boot.ini may help
> a bit, but don't expect miracles, 3.5GB out of total 4 - is very good.
>
>
> "Ken Blake, MVP" <kblake@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:%235wkbLU5FHA.1536@xxxxxxxxxxxxxxxxxxxxxxx
>> IanCoward wrote:
>>
>>> Are there any limits in the amount of Useable RAM while using
>>> Windows XP Home or Professional?
>>
>>
>> It's the same for both versions--4GB. That may be more than your
>> motherboard holds, and is probably more than you can make effective
>> use of..
>>
>>
>>> Also would using large amounts of RAM cause
>>> conflicts elsewhere, with other hardware (graphics cards etc.)?
>>
>>
>>
>> No, but to use 4GB of RAM you have to add a switch to a line in the
>> [Operating Systems] section of boot.ini. Change /fastdetect to
>> /fastdetect /3GB
>>
>> --
>> Ken Blake - Microsoft MVP Windows: Shell/User
>> Please reply to the newsgroup


.

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