Chuck Norcutt said the following on 3/17/09 11:39 AM:
> That probably wasn't well stated. It would probably require some 64 bit
> virtual machine hypervisor to manage the multiple 32 bit instances of
> Windows. Maybe that's 64 bit Windows itself. I dunno. I'm sure that
> Microsoft will be sure to charge us for each copy. :-)
Almost all Intel processors after the Pentium Pro support 36-bit addressing
using what's known as physical address extensions (PAE). That allows for a
total of 64GB of physical memory while still running in 32-bit mode. Some
versions of Windows supports PAE but the applications running on Windows are
still limited to 4GB each.
Having multiple cores makes no difference as all the memory is shared except on
the new Nehalem based Xeon cpu's. In Nehalem each cpu has local memory and the
OS needs to take that in account when assigning memory to tasks running on a
particular core.
-mark
>
> Chuck Norcutt
>
> Chuck Norcutt wrote:
>> I don't know but I wouldn't be surprised that 64 bit processors running
>> in 32 bit mode could somehow virtualize up to a 4GB chunk of memory for
>> their own use. But I should think that would entail multiple instances
>> of Windows with each running on their own processor. I haven't paid any
>> attention to Intel machine architecture in about 10 years. Probably too
>> complicated for me now.
>>
>> Chuck Norcutt
>>
>> Jez Cunningham wrote:
>>> I once saw a comment that a dual (or quad) core processor can use 3GB per
>>> core - can anyone confirm that?Jez
>>>
>>> On Tue, Mar 17, 2009 at 2:33 AM, Chuck Norcutt <
>>> chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>>
>>>> 32 bit Windows won't use more than 3GB of that without some cryptic
>>>> settings changes but at the price who cares if there's an unused 1GB of
>>>> RAM.
>>>>
>>>> Chuck Norcutt
>>>>
--
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