4GB Mem. on 32 bit system

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packman · #1 Post by **packman** » Thu Jun 21, 2007 1:09 pm

Can i install 4GB Mem. on 32 bit Vista Business OS., or will it just recognize up to 3GB.

whizkid · #2 Post by **whizkid** » Thu Jun 21, 2007 1:13 pm

Yes, you can install 4GB, and yes, it will use 3GB or 3.5GB depending on the system.

SFWrtr · #3 Post by **SFWrtr** » Thu Jun 21, 2007 1:25 pm

X61Tablet with 4GB shows 3062MB under Windows Vista Ultimate. The PAE setting doesn't make a difference, with or without DEP. Seems it requires the P965 not the G series to work. Guess we have to go to 64-bit!

barrywohl · #4 Post by **barrywohl** » Thu Jun 21, 2007 10:29 pm

SFWrtr wrote:X61Tablet with 4GB shows 3062MB under Windows Vista Ultimate. The PAE setting doesn't make a difference, with or without DEP. Seems it requires the P965 not the G series to work. Guess we have to go to 64-bit!

I'm sorry I'm such a newbie. Can someone translate for me? I'm also really interested in the answer to this question.

poky · #5 Post by **poky** » Thu Jun 21, 2007 10:48 pm

barrywohl wrote:
SFWrtr wrote:X61Tablet with 4GB shows 3062MB under Windows Vista Ultimate. The PAE setting doesn't make a difference, with or without DEP. Seems it requires the P965 not the G series to work. Guess we have to go to 64-bit!
I'm sorry I'm such a newbie. Can someone translate for me? I'm also really interested in the answer to this question.

Vista 64 will not run with 4 GB or greater memory installed.

Thats a funny thing that Microsoft forgot to tell its custommers

Oops!

SFWrtr · #6 Post by **SFWrtr** » Fri Jun 22, 2007 2:02 am

poky wrote:Vista 64 will not run with 4 GB or greater memory installed. Thats a funny thing that Microsoft forgot to tell its customers. Oops!

32-bit Vista is documented as not being able to run 4GB by Microsoft, as are other OSes by other vendors. It is documented that 64-bit Vista and XP will run 4GB on Core 2 Duo machines, esp. these Santa Rosa CPUs, AFAIK. If you have a reference for your assertion, please prove it's true (and I hope it is not) by providing links, etc.

barrywohl wrote:I'm sorry I'm such a newbie. Can someone translate for me? I'm also really interested in the answer to this question.

BTW, to learn about PAE (physical address extension - Windows boot option), DEP (Data Execution Protection - BIOS setting), and other limits, here are good links to start with. There are also fairly recent threads in this forum and the Vista forums about PAE.

http://support.microsoft.com/kb/929605
http://support.microsoft.com/kb/929580/en-us
http://www.google.com/search?q=PAE+vista

whizkid · #7 Post by **whizkid** » Fri Jun 22, 2007 9:36 am

The 8086, with its 20-bit addressing space of 1MB. Some was reserved for BIOS, and some more for I/O, and you're left with 640K for RAM. Bank-switching allows for more memory.

It's exactly the same, except with a 32-bit addressing space, there's a total of 4GB of addresses. Some is reserved for BIOS, some for I/O and you're left with 3.5GB of RAM. (I wonder if it's 3GB+640K...)

So you can either use bank-switching of some kind (hopefully just ONE kind like PAE so all the machines are compatible) or start using 64-bit processors.

larsv · #8 Post by **larsv** » Fri Jun 22, 2007 10:41 am

Here's some more detailed information and myth debunking re PAE. A bit technical, by a Microsoftee.

http://blogs.msdn.com/oldnewthing/archi ... 18527.aspx

crashnburn · #9 Post by **crashnburn** » Sun Apr 25, 2010 10:56 am

I have Win XP Pro SP3 as shows below: (It shows PAE, but I dont have it enabled in Boot.ini)

Boot.ini

I have 2 x 2GB RAM.

Simply speaking, keeping to Win XP 32 (might be a little while before I go for Win7 64 straight away) how can I maximize the RAM. Do I get 4G or 3.5 or something?

Please give me the quick and dirty of how to enable the PAE etc.. stuff if its not already enabled.

dsvochak · #10 Post by **dsvochak** » Sun Apr 25, 2010 11:23 am

T60/T61/p memory limitations -- the definitive answer [pics]

#11 Post by **jdhurst** » Sun Apr 25, 2010 11:55 am

poky wrote:<snip>
Vista 64 will not run with 4 GB or greater memory installed.

Thats a funny thing that Microsoft forgot to tell its custommers

Oops!

It the hardware is capable of 64-bits, then 64-bit OS's will run on it *and* provide for full 4Gb usage - Vista Business 64-bit and Windows 7 Pro 64-bit both.

My T61p is such a machine, has 4Gb and it is all recognized. .... JDH

crashnburn · #12 Post by **crashnburn** » Mon Apr 26, 2010 11:17 pm

dsvochak wrote:T60/T61/p memory limitations -- the definitive answer [pics]

Thanks

I figured I'd seen this thread somewhere before.

4GB Mem. on 32 bit system

4GB Mem. on 32 bit system

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