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-   -   64bit + 4gb of memory (https://www.hardwarecanucks.com/forum/troubleshooting/9805-64bit-4gb-memory.html)

enaberif September 2, 2008 05:25 PM

64bit + 4gb of memory
 
So it appears there seems to be some discrepancies either with motherboards or OS's or the bios of a motherboard.

Some people are reporting they infact are able to use their full 4gb of memory in their OS but others are saying like myself no you only get 3.7gb or so.

Both my motherboards I've had report this.

What does yours report?

Code:

OS Name        Microsoft(R) Windows(R) XP Professional x64 Edition
Version        5.2.3790 Service Pack 2 Build 3790
Other OS Description        Not Available
OS Manufacturer        Microsoft Corporation
System Name        MOO
System Manufacturer        BIOSTAR Group
System Model        TPower I45
System Type        x64-based PC
Processor        EM64T Family 6 Model 23 Stepping 10 GenuineIntel ~3600 Mhz
Processor        EM64T Family 6 Model 23 Stepping 10 GenuineIntel ~3600 Mhz
BIOS Version/Date        American Megatrends Inc. 080015, 7/10/2008
SMBIOS Version        2.5
Windows Directory        C:\WINDOWS
System Directory        C:\WINDOWS\system32
Boot Device        \Device\HarddiskVolume1
Locale        United States
Hardware Abstraction Layer        Version = "5.2.3790.3959 (srv03_sp2_rtm.070216-1710)"
User Name        MOO\Administrator
Time Zone        Pacific Daylight Time
Total Physical Memory        4,093.95 MB
Available Physical Memory        3.31 GB
Total Virtual Memory        5.76 GB
Available Virtual Memory        5.32 GB
Page File Space        2.00 GB
Page File        D:\pagefile.sys


Infiniti September 2, 2008 05:28 PM

I thought that in 64bit, all your 4gb should show.. Are you sure your not talking about 32bit?

EDIT: Nevermind, I see that thing now. But mine shows 4GB here.

JD September 2, 2008 05:30 PM

Quote:

Total Physical Memory 4,093.95 MB
Seems fine to me. If you want to be really picky, you're off by 2.05MB but I think that's pretty normal. Where are you getting this 3.7GB number from?

enaberif September 2, 2008 05:33 PM

Quote:

Originally Posted by jdrom17 (Post 85638)
Seems fine to me. If you want to be really picky, you're off by 2.05MB but I think that's pretty normal. Where are you getting this 3.7GB number from?

Look at the available its 3.7 that's the problem.

32bit will show that you have 4gb too but will only have between 2.5-3.2gb of available memory.

SugarJ September 2, 2008 05:35 PM

Like this:
http://www.hardwarecanucks.com/forum...dd38d1605a.jpg

Note the Total physical memory. I think it has to do with improper remapping of PCI memory above the physical memory. And I do have the remapping option on in my BIOS.

Oversized Rooster September 2, 2008 05:42 PM

Damn that doesn't look good. I get my full 4GB here. I'm using an Asus P5Q-E which is also P45-based.

http://gergin.net/posts/4GB%20Memory.JPG

LCB001 September 2, 2008 06:04 PM

1 Attachment(s)
I get the full 4GB, P5Q Deluxe

Attachment 2799

SugarJ September 2, 2008 06:05 PM

And I had the full 4.0 GB available on my Giga-byte P35-DS3L board too before I swapped to this board.

edit: Give this a read. Microsoft blames it directly on the board manufacturers:
The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

Double Edit:
Hmm. My remapping option is on, but because this mobo is a combo DDR2/DDR3 board, the max DDR2 memory is 4GB. I'm wondering if that is limiting the remap with DDR2 memory. There physically isn't another trace on the board, so it can't physically address higher than 4GB addresses. Therefore, the PCI cards memory addresses must remain below the 4gb barrier. And I lose .75 GB of useable memory.

Anyone want to lend me 4GB of DDR3 so I can test my theory?

SKYMTL September 4, 2008 07:32 PM

Well, well, well. I am happy this came up because lookie what I found staring at me when I booted Windows Vista x64 Ultimate with an ASUS M3N78 Pro motherboard I got for review:

http://www.hardwarecanucks.com/forum...099fba8230.jpg

Try THAT little head scratcher on for size. Considering this is a 64-bit and I have NOT had this problem with past ASUS nor DFI boards, this one really has be stumped...

Installing SP1 now and then the new BIOS.

Cptn Vortex September 4, 2008 07:42 PM

1 Attachment(s)
heh, I get all 4.


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