How Much Memory Do You _Really_ Have?

[nick9191]

32bit Vista can address 4gb but can only use 3.25gb. If you have 4gb+ you need 64bit Windows, its nothing to do with the board.

 

[0098386]

I've only got 1gb but I'll probably up that to 2 or 3gb next paycheque.

 

[MacsRgr8]

on XP, open your c:\boot.ini file (its hidden i believe..its been a while) and add /PAE after the line that has all the boot info (disk, etc) and it will see over 2gb

Cheers!

I'll give that a go.

 

[martinlk]

32bit OS: 2^32 = 4294967296 B = 4096 MB
64bit OS: 2^64 = 1,844674407370955e+19 B = 17592186044415,996 MB = 17592186044415,996 GB

Yikes! That's a limitation we're not likely to run into for a while.

 

[Cryptic1911]

32bit OS: 2^32 = 4294967296 B = 4096 MB
64bit OS: 2^64 = 1,844674407370955e+19 B = 17592186044415,996 MB = 17592186044415,996 GB

Yikes! That's a limitation we're not likely to run into for a while.

they said that about 32 bit too

 

[Firefly2002]

It's not a "PC" problem, it's just a 32-bit problem. 2^32 is 4 billion binary bits (making it 4.29 billion something). That's total addressable memory space. Memory includes all memory in the system, including video card memory, caches, etc. So it's 4 GB minus whatever else is on the system.

 

[Infrared]

It's not a "PC" problem, it's just a 32-bit problem. 2^32 is 4 billion binary bits (making it 4.29 billion something). That's total addressable memory space. Memory includes all memory in the system, including video card memory, caches, etc. So it's 4 GB minus whatever else is on the system.

Well, yes and no. Even if you have enough space, you still
need to use it well. Some 64-bit systems lose memory in
the 3-4GB range because they don't support remapping.

 

[sash]

Hi,

10 GB in Mac Pro, 6 GB in G5, 2 GB in MBP. Everything is accessible; obviously, actual amount used depends on a task.

sash

 

[Amigalander]

on XP, open your c:\boot.ini file (its hidden i believe..its been a while) and add /PAE after the line that has all the boot info (disk, etc) and it will see over 2gb

I did this on my Mac Pro.

Windows System Properties still says 1.99GB but it also says Physical Address Extension now. Is it supposed to say 4GB after I added the /PAE flag?

 

[bart rijksen]

Have 4gb, use 2

 

[Minocan]

16 gigs, I tested with Soundtrack Pro, and I capped 13 gigs s with it on Tiger

 

[xraydoc]

Mac Pro
Installed: 6GB
Actually used: 6GB

I actually have 34MB of page-outs since my last reboot, so I could probably use even more RAM in the machine.

MacBook
Installed: 4GB
Actually used: generally around 2.5-3.0GB, but will peak close to 4GB when I've got my WinXP virtual machine running, too.

 

[Sun Baked]

The OS still has some HW mapped to memory addresses using DMA.

How much, don't know -- if you want to check I think they are there somewhere.

For the current chipsets, it really isn't enough to matter if you have 4GB or more of memory.

 

[Infrared]

I did this on my Mac Pro.

Windows System Properties still says 1.99GB but it also says Physical Address Extension now. Is it supposed to say 4GB after I added the /PAE flag?

It's a limitation of Apple's BIOS emulation.

ps

There's also a /3GB switch.

 

[Eraserhead]

16GB in my MacBook.



Seriously 2GB but it was just too tempting

 

[Infrared]

16GB in my MacBook.

View attachment 118138

Nice one! ( http://www.pixentral.com/show.php?picture=1YkSPniD4G7blYD6Q5aYdbXWQTD5O40 ) Anti-aliasing, old chap

 

[eMagine]

Have 12GB. Use 12GB.