Jump to content


Photo
- - - - -

4Gb Ram Not Been Seen


  • Please log in to reply
17 replies to this topic

#1 qtzar

qtzar

    New Member

  • Members
  • 5 posts

Posted 28 September 2005 - 10:06 AM

Hi,

I have just purchased my first DFI Motherboard and I have an unusual problem. I also purchased 4 x 1Gb PC400 memory sticks and when they are all installed in the machine both the bios post screen and MS Windows only report 2.75Gb of ram.

CPU-Z reports all 4Gb of ram being present.

I specifically need to get the 4Gb visible to the machine as I'm running some extreamly memory intensive applications.

Any help would be appreciated.

#2 ExtraPickles

ExtraPickles

    Certified Geek

  • Members
  • PipPipPipPip
  • 1112 posts

Posted 28 September 2005 - 10:19 AM

This thread tells you what to turn on in the BIOS.

http://www.dfi-stree...2&highlight=4gb

-pickles

#3 qtzar

qtzar

    New Member

  • Members
  • 5 posts

Posted 28 September 2005 - 10:43 AM

Thanks for the pointer, While I couldn't find that exact setting in the bios I did two settings, one for h/w memory remapping and one for s/w memory remapping. They were set to disabled so I have set them to enabled.

The POST is now showing 3.5Gb ram but WinXP is still showing 2.75Gb Ram. Not sure what went wrong there. I'll try clearing the bios, starting with optimised defaults and just a hardware memory remap enabled, see what happens.

Still why did the POST only show 3.5Gb and not 4gb.

#4 ExtraPickles

ExtraPickles

    Certified Geek

  • Members
  • PipPipPipPip
  • 1112 posts

Posted 28 September 2005 - 10:48 AM

I read in another post by Acegoober (I think) that this is a limitation of WinXP 32 bit I think. It uses .5 gig for addressing space. WinXP 64 bit I believe will show it all, if you can stand that OS. Search around in here, there's plenty of answers.

-pickles

#5 rldolph79

rldolph79

    Geek

  • Members
  • PipPipPip
  • 506 posts

Posted 28 September 2005 - 10:49 AM

Could you fill us in on what type of ram you have there? These boards have issues with certain types of memory...

#6 qtzar

qtzar

    New Member

  • Members
  • 5 posts

Posted 28 September 2005 - 11:00 AM

From the lable on the ram :

MCI Computer
MDT DDR 1024MB PC400 CL2.5
2 Bank 512M Chip (64Mx8)

From CPU-Z

CAS# Latency 2.5
RAS# to CAS# 3
RAS# Precharge 3
TRas# 8

Hope this helps. I'll update my sig with the MDT bit

#7 Greenbarr0n

Greenbarr0n

    Member

  • Members
  • PipPip
  • 147 posts

Posted 28 September 2005 - 11:15 AM

XP x64bit version is the only XP that supports 4G of Ram ATM, 3.5G is as much as x64 will identify. I have read that 4G of memory is tough to get working with x64 also, not to mention the peformance penalty for using 4 Dimm slots on an NF4 board.

If you really need 4G of Ram, you might need a different mainboard, such as the server/workstation class boards that support 8G Ram with Server 2003.

If you do figure out how to do this with your current setup, please let us know how you did it, sorry I can't be much help.

#8 qtzar

qtzar

    New Member

  • Members
  • 5 posts

Posted 29 September 2005 - 01:58 PM

After a bit of research it seems that the issue is actually caused by Windows Xp SP2. After an upgrade to SP2 Physical Address Mapping is enabled and the max that Windows reports is 2.75Gb with this m/board. :-(

#9 r00ter4u

r00ter4u

    New Member

  • Members
  • 21 posts

Posted 30 September 2005 - 07:33 AM

After a bit of research it seems that the issue is actually caused by Windows Xp SP2. After an upgrade to SP2 Physical Address Mapping is enabled and the max that Windows reports is 2.75Gb with this m/board. :-(


actually. my windows does show the 3gb of ram tha ti have installed. but if any of you are familiar with mirc. a script based command in mirc only shows 2gb. i have no idea why. CPUz shows 3gb

#10 Squid1

Squid1

    Certified Geek

  • Members
  • PipPipPipPip
  • 1142 posts
  • Gender:Male

Posted 30 September 2005 - 08:19 AM

actually. my windows does show the 3gb of ram tha ti have installed. but if any of you are familiar with mirc. a script based command in mirc only shows 2gb. i have no idea why. CPUz shows 3gb


The 2 GB is most likely the virtual memory that a default Windows userland process can see (unless you shift the username/kernel barrier), not physical memory.

#11 Zatarain

Zatarain

    New Member

  • Members
  • 20 posts

Posted 30 September 2005 - 09:22 AM

Windows whitepaper for the 2006 "Vista" release which is in Beta 1, will be addressing the issue of using 4Gb of RAM or greater. At this time it is again a "Beta 1 Release", and nothing has been put in stone. We will know more next Summer when Beta 2 is released.

#12 r00ter4u

r00ter4u

    New Member

  • Members
  • 21 posts

Posted 30 September 2005 - 12:05 PM

Windows whitepaper for the 2006 "Vista" release which is in Beta 1, will be addressing the issue of using 4Gb of RAM or greater. At this time it is again a "Beta 1 Release", and nothing has been put in stone. We will know more next Summer when Beta 2 is released.



the PDC version is 5219. its not exactly Beta 2 but the Pre-Beta. but thats just off topic..