Developer Forum

Hi,

My notebook (toshiba satellite 1955-S803) specification states that the
memory is expandable to 1024MB.

I wonder if I could have only one single module of 1024MB instead of
two modules of 512. How do I know whether there is a limitation per
module?

Today, I have two modules of 256. Now I want to upgrade to 1GB memory
but I am not sure whether I can use a single module of 1024.

What do you say?

This is exactly what it says in the specification:

Memory
512MB SDRAM (Expandable to 1024MB)
Expansion memory: SODIMM, PC2100 DDR SDRAM, 2.5V
Data/Address Bus Width; 64-bit/32-bit
BIOS ROM: Intel FWH; 4Mbit
Intel 845 Chipset

The specification also suggests the use of the following modules:

Kingston Memory
KTT3614/128 128MB PC2100 DDR SDRAM
KTT3614/256 256MB PC2100 DDR SDRAM
KTT3614/512 512MB PC2100 DDR SDRAM

G'day David

From my understanding it's best to have RAM modules in matching
pairs......ie 2 x 512Mb (to equal 1024Mb). Someone with more knowledge
can correct me here?

How many slots does your Toshie have?

The upgrade will be worth the extra speed gained. Good luck ;-)





> 512MB SDRAM (Expandable to 1024MB) >> Expansion memory: SODIMM, PC2100 DDR SDRAM, 2.5V> > Data/Address Bus Width; 64-bit/32-bi>
> BIOS ROM: Intel FWH; 4Mb>t
> Intel 845 Chip>et >>
> The specification also suggests the use of the following modul>s: >>
> Kingston Mem>ry
> KTT3614/128 128MB PC2100 DDR SD>AM
> KTT3614/256 256MB PC2100 DDR SD>AM
> KTT3614/512 512MB PC2100 DDR SD>AM

There is no automatic benefit to having RAM modules in matching pairs
except on systems using "dual channel" memory, where there either is a
benefit (if the memory is not a matching pair it will operate in a
single-channel mode) or it just won't work at all. The chipset
determines if the memory is capable of dual channel operation, and it's
a significant enough feature that it should be prominently listed if the
laptop offers it. [Note that the 845 chipset used in the OP's computer
does not offer dual channel memory]

For most users, the benefit from going beyond 512 megs with XP is small.
This does depend on both what programs you are running and how you use
the computer, but for the typical user of desktop apps, by the time you
get to 512 megs you have most of the benefits that larger memory can
provide. For *** , CAD and some other applications, however, or users
who often open many apps at once, going above 512 megs may be worthwhile.




>> 512MB SDRAM (Expandable to 1024MB) >>> Expansion memory: SODIMM, PC2100 DDR SDRAM, 2.5V>>>> Data/Address Bus Width; 64-bit/32-bi>> >> BIOS ROM: Intel FWH; 4Mb>>
>> Intel 845 Chip>>t >>>
>> The specification also suggests the use of the following modul>>: >>>
>> Kingston Mem>>y
>> KTT3614/128 128MB PC2100 DDR SD>>M
>> KTT3614/256 256MB PC2100 DDR SD>>M
>> KTT3614/512 512MB PC2100 DDR SD>>M

Barry, thanks for that explanation! 512Mb had been OK for my needs (XP)
until recently when I had a big photo scanning project and kept getting
an 'Out of Memory' error message.

Thanks again....at least I've learned something new today.
Bronwyn ;-)





>>> 512MB SDRAM (Expandable to 1024MB) >>>> Expansion memory: SODIMM, PC2100 DDR SDRAM, 2.5V>>>>> Data/Address Bus Width; 64-bit/32-bi>>>>>> BIOS ROM: Intel FWH; 4Mb>>> >>> Intel 845 Chip>>>
>>> The specification also suggests the use of the following modul>>>
>>> Kingston Mem>>>
>>> KTT3614/128 128MB PC2100 DDR SD>>>
>>> KTT3614/256 256MB PC2100 DDR SD>>>
>>> KTT3614/512 512MB PC2100 DDR SD>>>