Re: 4GB on Laptop?

On Mon, 30 Jul 2007 13:51:30 +0000, Jean-David Beyer wrote:

General Schvantzkoph wrote:
On Sun, 29 Jul 2007 23:59:15 +0000, Jean-David Beyer wrote:

General Schvantzkoph wrote:
On Mon, 30 Jul 2007 00:55:38 +0200, Felix M. Palmen wrote:

* General Schvantzkoph <schvantzkoph@xxxxxxxxx>:
I'm now of the
opinion that the default choice should be 64 bits unless the user
has some important application that can't run on a 64 system.
Although I'd agree with you here, I don't see how this is related to
this thread? After all, the OP's laptop seems to be an IA32 machine.

Regards, Felix
I didn't read his post closely enough although I'm surprised that
that a 32 bit laptop can hold 4G. Laptops only have 2 slots so you
need 2G DIMMS which are only available in DDR2.
I have a data*** from Micron where they claim to make DDR memory in
1 GByte, 2 GByte, and 4 GByte units.

MT36VDDT12872 ­ 1GB
MT36VDDT25672 ­ 2GB
MT36VDDT51272 ­ 4GB

at these speeds:

PC1600 or PC2100

Is there a 32 bit processor that
supports DDR2? I thought the all 32 bit systems were DDR not DDR2.

Those are registered DIMMS for servers not laptops

I do not know what laptops use. It happens I use registered DIMMS fom my
desktop, but it is not a laptop. If they make registered ones, they
might make unregistered ones as well, though I did not look.

Laptops use SO-DIMMS which are much smaller then the DIMMs used in
desktops or servers. There is no such thing as a registered SO-DIMM.
Putting registers on a DIMM allows you to double or even quadruple the
number of chips that you put on the DIMM. Server DIMMs have room for
these extra chips, you could even make the DIMM taller if you wanted to
build a really big DIMM. The laptop DIMM is only half the size of a
desktop/server DIMM so there is only room for 8 chips, four on each side.
The largest DDR chip made is 1G so that limits DDR SO-DIMMs to 1GByte.
There are 2G DDR2 RAMs so the DDR2 SO-DIMMs can be 2 GBytes.
.

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