[ltp] Only 3 out of 4 GB detected

[Cherife Li]

On 05/31/08 00:38, Laurent Gilson wrote:
> Hi,
> 
>> The question is why his system just shows 3 out of 4 GB RAM.
> 
> Cause it cannot address more.
> 
>> Do you mean the 3GB is usable and so the system shows this amount of RAM?
>> But the IO-space and gfx also use the memory, by the system, aren't they?
> 
> The 945M has 4GB address space to work with. It has to contain IO-spaces
> (PCI, DMA and other long forgotten stuff), gfx-RAM and the real normal
> RAM. Dune to this limitation you cannot go past ~3GB usable RAM on a
> 945M board. No CPU-extension can get past this.
> 
> => http://www.dansdata.com/askdan00015.htm
> 
>>> The 965 can do 8GB (even in 32Bit mode). Since the IO-Space and gfx
>>> takes about 1GB and you cannot install more then 4GB RAM => no
>>> limits. See http://www.intel.com/products/chipsets/P965/index.htm
>>>
>> Ah, So *61s can only support a max 4GB RAM?
> 
> The 61 have Intel 965M chipsets and 2 SoDimm Slots. You can install
> 4GB (2x2GB since the 4GB-modules are not available yet) and use
> them (using PAE, aka bigmem or 64Bit kernels). In the future with
> real 4GB SoDimms you can install 8GB and use around 7GB.
> 
>> But I saw that HP is selling laptops (965 chipset) with 8GB RAM.
> 
> Dell sells a lot of 4GB systems with 32Bit Vista (Vista does not
> do PAE and is limited to 4GB address space => 3GB or less usable).
> HP did the same thing with some workstations and starts doing it
> on notebooks now.
> 
> People will buy anything.
> 
> cu
THX for your clarification.
Something's wrong with my previous understand on 60s' arch.
-- 
Rgds,
Cherife.