Only 3.1GB RAM recognized in P5LD2-VM
in [Asus]
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From: sjledet on 1 Jan 2006 08:06 I have four gigs installed but board only recognizes 3.1GB on boot. Windows reports 3,267,660 KB physical memory. The manual says "Due to chipset resource allocation, the system may detext less than 4GB system memory when you instealled four 1Gb DDR2 memory modules." Soes anybody have any suggestions? Sterling Ledet Adobe training http://www.ledet.com/adobe
From: Roger Hamlett on 1 Jan 2006 09:25 <sjledet(a)ledet.com> wrote in message news:1136120791.391545.230170(a)z14g2000cwz.googlegroups.com... >I have four gigs installed but board only recognizes 3.1GB on boot. > Windows reports 3,267,660 KB physical memory. > > The manual says "Due to chipset resource allocation, the system may > detext less than 4GB system memory when you instealled four 1Gb DDR2 > memory modules." > > Soes anybody have any suggestions? > > Sterling Ledet Adobe training > http://www.ledet.com/adobe This is normal. Unfortunately, unless you are running a machine with addressing extensions enabled, your total memory 'space' addressable by the processor, is 4GB. The AGP card itself, will map into a huge slice of this, the BIOS, another large slice, and most I/O cards/devices will also grab big pieces of the memory area. This is why many boards implement one of the address extension schemes, which reduces this problem. If your board offers an address extension mode in the BIOS, try enabling this (you may also have to modify the XP boot). If not, then there is nothing that can be done, except to minimise the number of added cards/devices. The difference can be large. On a machine with two video cards, I have seen the useable memory change from 3.1GB, to 3.8GB, by enabling these extensions. Generally though, chipsets aimed at the 'user', rather than 'workstation/server' markets, do not implement such extensions (assuming that people will probably not try to use 4GB of RAM). Best Wishes
From: Paul on 1 Jan 2006 16:00 In article <dDRtf.20872$mn1.1716(a)newsfe7-win.ntli.net>, "Roger Hamlett" <rogerspamignored(a)ttelmah.demon.co.uk> wrote: > <sjledet(a)ledet.com> wrote in message > news:1136120791.391545.230170(a)z14g2000cwz.googlegroups.com... > >I have four gigs installed but board only recognizes 3.1GB on boot. > > Windows reports 3,267,660 KB physical memory. > > > > The manual says "Due to chipset resource allocation, the system may > > detext less than 4GB system memory when you instealled four 1Gb DDR2 > > memory modules." > > > > Soes anybody have any suggestions? > > > > Sterling Ledet Adobe training > > http://www.ledet.com/adobe > > This is normal. > Unfortunately, unless you are running a machine with addressing extensions > enabled, your total memory 'space' addressable by the processor, is 4GB. > The AGP card itself, will map into a huge slice of this, the BIOS, another > large slice, and most I/O cards/devices will also grab big pieces of the > memory area. This is why many boards implement one of the address > extension schemes, which reduces this problem. If your board offers an > address extension mode in the BIOS, try enabling this (you may also have > to modify the XP boot). If not, then there is nothing that can be done, > except to minimise the number of added cards/devices. > The difference can be large. On a machine with two video cards, I have > seen the useable memory change from 3.1GB, to 3.8GB, by enabling these > extensions. Generally though, chipsets aimed at the 'user', rather than > 'workstation/server' markets, do not implement such extensions (assuming > that people will probably not try to use 4GB of RAM). > > Best Wishes To add to Roger's info, there is this Intel doc on the Asus site, and it contains Intel's explanation of the 4GB issues. http://dlsvr01.asus.com/pub/ASUS/mb/4GB_Rev1.pdf The 945P chipset doesn't support memory remapping AFAIK. So chapter 4 of the Intel document won't apply to your board. If you look for a motherboard like a P5WD2 Premium (955 based), which lists support for 8GB of memory, it should have a memory remapping function in the BIOS. One problem with the "memory remapping" or "memory hoisting" function, is that Asus doesn't always document the setting in the initial manual, so that makes it difficult to prove that such a setting exists. (On one of the Asus AMD motherboards, the code was only added to the BIOS, in the fifth BIOS release. Such late delivery of features makes it difficult to be sure what you are getting!) But the combination of memory remapping, plus an OS that properly supports 4 or more GB of remapped memory, would be a step in the right direction. I suspect very few users get this working right, as I've never seen a "success" posting from any user who has asked this question. Maybe some day we'll get a little useful feedback. HTH, Paul
From: Robert Hancock on 1 Jan 2006 17:03 sjledet(a)ledet.com wrote: > I have four gigs installed but board only recognizes 3.1GB on boot. > Windows reports 3,267,660 KB physical memory. > > The manual says "Due to chipset resource allocation, the system may > detext less than 4GB system memory when you instealled four 1Gb DDR2 > memory modules." On that motherboard there is no way around this. The MMIO regions for devices, video cards, etc. cover up the 800MB of unusable memory. Most Athlon 64 boards have the ability to remap memory in such regions above 4GB (this capability is part of the on-chip memory controller) but normal Intel desktop chipsets do not. To make use of this, you also need either Linux, 64-bit Windows or a server version of Windows, as normal WinXP will not use memory above 4GB. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr(a)nospamshaw.ca Home Page: http://www.roberthancock.com/
From: John Lewis on 1 Jan 2006 17:17
On 1 Jan 2006 05:06:31 -0800, sjledet(a)ledet.com wrote: >I have four gigs installed but board only recognizes 3.1GB on boot. >Windows reports 3,267,660 KB physical memory. > >The manual says "Due to chipset resource allocation, the system may >detext less than 4GB system memory when you instealled four 1Gb DDR2 >memory modules." > >Soes anybody have any suggestions? > yes, install Windows XP 64, which recognizes up to 12Gbyte of RAM. However, you will also need all the required 64-bit drivers for your motherboard and peripherals, and various 32-bit applications do not yet have 64-bit-compatible patches. This particular Windows XP (32) limitation is well-known. John Lewis >Sterling Ledet Adobe training >http://www.ledet.com/adobe > |