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Enabeling PAE in Vista


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you don't need to enable pAE to address 4 gigs of memory, only if you want to address more then 4 gig would you need to enable it

Hi all !

I have 4 gig of memory in my PC and Vista 32 recognize only 3326MB.

If i install Vista 64 all my memory is recognised.

I must say that Vista 32 do not use PAE ! if i'm not wrong.

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If you disable pagefile/swapfile (is it around 770MB?) completely and then restart does Vista still not allocate all of your RAM?

According to this maximum RAM is 4GB for 32-bit editions. If this covers total memory including pagefile I don't know, but I think so judging from the above.

Edited by Jeronimo
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Hi !

My swap is always disabled.

I dont need it with 4Go of RAM (Vista is more responsive without swap).

With swap file enabled/disabled the system says 3326MB with Vista 32 and 4096MB with Vista 64 !

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Video RAM shadowing, BIOS hot-add memory reservations, PCI-E and PCI-X slots - all of those things chew up RAM because they get reserved on boot. If you run msinfo32 from start > run, how much "Total Physical Memory" does it show? If it shows 4GB (~4029 or higher), then it's a BIOS issue.

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How much memory do you have on your videocard or in the case of UMA video, how much did you allocate to the framebuffer. Per MS spec they will mirror that amount in main mem. IIRC its described in the WHQL docs for meeting logo requirements.

Hi !

Ok but 3gb = 3 X 1024 = 3072

but my system says 3326M !

Why this number ?

Vista 64 says 4096MB !?

And a quick note on PAE, if Vista detects it in CPUID it'll use it.

Edited by sprack
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Hi all !

Everest report:

--------[ EVEREST Ultimate Edition 2007 © 2003-2007 Lavalys, Inc. ]---------------------------------------------------

Version EVEREST v3.80.888 Beta

Benchmark Module

Homepage http://www.lavalys.com/

Report Type Quick Report

Computer MFCK-PC

Generator Mfck

Operating System Microsoft Windows Vista Ultimate 6.0.6000 (Vista Retail)

Date 2007-02-21

Time 22:47

--------[ Memory ]------------------------------------------------------------------------------------------------------

Physical Memory:

Total 3325 MB

Used 702 MB

Free 2622 MB

Utilization 21 %

Swap Space:

Total 3207 MB

Used 725 MB

Free 2482 MB

Utilization 23 %

Virtual Memory:

Total 6532 MB

Used 1427 MB

Free 5105 MB

Utilization 22 %

Physical Address Extension (PAE):

Supported by Operating System Yes

Supported by CPU Yes

Active Yes


Edited by MFCK
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Msinfo32 report:

OS Name Microsoft® Windows Vista™ Ultimate

Version 6.0.6000 Build 6000

Other OS Description Not Available

OS Manufacturer Microsoft Corporation

System Name MFCK-PC

System Manufacturer INTEL_

System Model DP965LT_

System Type X86-based PC

Processor Intel® Core2 CPU 6400 @ 2.13GHz, 2128 Mhz, 2 Core(s), 2 Logical Processor(s)

BIOS Version/Date Intel Corp. MQ96510J.86A.1618.2007.0117.1535, 17/01/2007

SMBIOS Version 2.4

Windows Directory C:\Windows

System Directory C:\Windows\system32

Boot Device \Device\HarddiskVolume1

Locale France

Hardware Abstraction Layer Version = "6.0.6000.16407"

User Name Mfck-PC\Mfck

Time Zone Standard Time

Total Physical Memory 3 325,11 MB

Available Physical Memory 2,59 GB

Total Virtual Memory 3,13 GB

Available Virtual Memory 2,45 GB

Page File Space ,00 KB

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Hi all !

cluberti you was true ! :thumbup

Ok, here some Intel explanations :

2.1 Memory Map

2.1.1 Addressable Memory

The board utilizes 8 GB of addressable system memory. Typically the address space

that is allocated for PCI Conventional bus add-in cards, PCI Express configuration

space, BIOS (SPI Flash), and chipset overhead resides above the top of DRAM (total

system memory). On a system that has 8 GB of system memory installed, it is not

possible to use all of the installed memory due to system address space being

allocated for other system critical functions.

These functions include the following:

BIOS/ SPI Flash (8 Mbits)

Local APIC (19 MB)

Digital Media Interface (40 MB)

Front side bus interrupts (17 MB)

PCI Express configuration space (256 MB)

MCH base address registers, internal graphics ranges, PCI Express ports (up to 512 MB)

Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI Express add-in cards


Intel Desktop Board DP965LT Technical Product Specification

The amount of installed memory that can be used will vary based on add-in cards and

BIOS settings.

Figure 14 shows a schematic of the system memory map. All installed

system memory can be used when there is no overlap of system addresses.

8 GB

Vista 32 show 3326MB in control panel/system and task manager display 3207MB



Vista 64 show 4096MB in control panel/system and task manager display 3325MB

Edited by MFCK
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I've recently upped my RAM to 4gb and it also reads 3325mb in the Task Mgr. Frankly I did this out of curiousity as I had an extra 2gb of RAM laying around so plugged them in. Didnt really expect to see any improvement in performance but I was wrong! Certain games that would write several hundred mb to the pagefiles would do that no more, still some pagefile activity but its was minimal. And it was much smoother playing these games. Also Superfetch seems to load more apps and assign more memory to them with 4gb, at certain points the task mgr was reporting almost all the memory used with less than 10mb free, so you know these will be quite responsive when needed. This with a 965P chipset board (Gigabyte DS3), I think older boards may not see the same results.

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