Windows XP Professional x64 Only Seeing 3GB RAM?
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From: miso on 17 Dec 2007 01:25 On Dec 15, 2:57 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: > It's not BS. I have a box with a mobo that refuses to support 4GB ram under > Windows x64. It does support 4GB under 32-bit Windows but not 64-bit. It > does happen. It is a design flaw and would take a different mobo to fix. > > "Dan" <Danodem...(a)gmail.com> wrote in message > > news:d0136760-5499-44ce-92cb-c57ab77ed669(a)b1g2000pra.googlegroups.com... > > > On Dec 15, 12:58 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: > >> What did HP tell you when you asked a support person? > > >> "Dan" <Danodem...(a)gmail.com> wrote in message > > >>news:7a663206-fca0-48e0-9240-d0c53ed79f66(a)w56g2000hsf.googlegroups.com... > > >> > On Dec 14, 5:16 pm, Dan <Danodem...(a)gmail.com> wrote: > >> >> On Dec 14, 4:35 pm, m...(a)sushi.com wrote: > > >> >> > On Dec 14, 4:42 am, Dan <Danodem...(a)gmail.com> wrote: > > >> >> > > Windows XP Professional x64 and 4GB RAM? > >> >> > > Alright, So with all the development and what not that I do, I > >> >> > > decided > >> >> > > to upgrade my system to 4GB of RAM. Also, due to software > >> >> > > incompatibilities with Vista, I decided the my only real choice > >> >> > > was > >> >> > > Windows XP Professional x64 for my OS. I ran through the entire > >> >> > > install, got all my drivers, everything seemed to be going well. I > >> >> > > got > >> >> > > my RAM today in the mail, slapped it in, checked the BIOS, and > >> >> > > everything looked good. However, once I got into Windows, it only > >> >> > > shows that I have 3GB > >> >> > > available:http://i60.photobucket.com/albums/h33/danodemano/Spec.jpg > > >> >> > > I checked with CPUZ to make sure that it was seeing the full 4GB > >> >> > > and > >> >> > > it > >> >> > > was:http://i60.photobucket.com/albums/h33/danodemano/CPUZ_RAM.jpg > > >> >> > > Now correct me if I'm wrong, but I had always thought that XP > >> >> > > 64-bit > >> >> > > supported something like 128GB of RAM....so why is my system not > >> >> > > seeing the full 4GB???? Is there some option that I have to enable > >> >> > > to > >> >> > > allow Windows to use the full 4GB??? > > >> >> > > Any help would be appreciated, thanks!! > > >> >> > On my mobo, you need to get into the bios, enter control+F1, which > >> >> > adds more features to tweak. Then find "memory remap." > > >> >> Interesting....I will try that and let you know how it turns out. I > >> >> have an HP laptop though so I don't know how much I can do with the > >> >> BIOS. > >> >> This is my motherboard info if that > >> >> helps:http://i60.photobucket.com/albums/h33/danodemano/Motherboard.jpg > > >> > No luck.....I can't seem to get into any of the hidded options of the > >> > BIOS. It's propably something that HP has done to keep me from doing > >> > it, I'm sure..... > >> > Grrr....guess I'm just out of luck at this point, unless someones has > >> > any ideas??? > > > They said that it doesn't support 4GB of RAM and that there was > > nothing that they could do....the typical BS answer I'm sure. I thought the 32 bit MS OS couldn't span the full 32 bits, but about 3.2G. Here is a microsoft link indicating 32 bit windows is limited to 3.12G http://support.microsoft.com/kb/929605/en-us
From: Colin Barnhorst on 17 Dec 2007 02:34 The 32-bit address space is 4GB (meaning there can be no more than 4GB's of unique addresses using 32-bits. What happens is that some memory is blocked for hardware use in the BIOS by the manufacturers (the amount varies a lot and is somewhat user adjustable). This seems to be especially true of mobos supporting SLI. Windows also uses some of the higher addresses for system space and this is not reported to user programs as installed memory. In a system with less than 4GB those system addresses are offset by the memory manager into installed ram as needed and the memory manager prevents user programs from overwriting. When 4GB is intalled the system address space does not need to be offset but it is still necessary to keep user programs out. However, another method is used, resulting in the "lost" ram effect. Consequently, the effect is only seen when the full 4GB address space exists in physical ram. btw, on a 64-bit system you would see the same effect but only if a full 128GB of physical ram was installed. Then the upper GB or so would appear to be "lost" and Windows would report 127GB. In any case, the computer should be using the full 4GB of ram but Windows will report only the user program space available. <miso(a)sushi.com> wrote in message news:952929db-ad85-498b-b786-54b9f5db92d1(a)s12g2000prg.googlegroups.com... > On Dec 15, 2:57 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >> It's not BS. I have a box with a mobo that refuses to support 4GB ram >> under >> Windows x64. It does support 4GB under 32-bit Windows but not 64-bit. >> It >> does happen. It is a design flaw and would take a different mobo to fix. >> >> "Dan" <Danodem...(a)gmail.com> wrote in message >> >> news:d0136760-5499-44ce-92cb-c57ab77ed669(a)b1g2000pra.googlegroups.com... >> >> > On Dec 15, 12:58 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >> >> What did HP tell you when you asked a support person? >> >> >> "Dan" <Danodem...(a)gmail.com> wrote in message >> >> >>news:7a663206-fca0-48e0-9240-d0c53ed79f66(a)w56g2000hsf.googlegroups.com... >> >> >> > On Dec 14, 5:16 pm, Dan <Danodem...(a)gmail.com> wrote: >> >> >> On Dec 14, 4:35 pm, m...(a)sushi.com wrote: >> >> >> >> > On Dec 14, 4:42 am, Dan <Danodem...(a)gmail.com> wrote: >> >> >> >> > > Windows XP Professional x64 and 4GB RAM? >> >> >> > > Alright, So with all the development and what not that I do, I >> >> >> > > decided >> >> >> > > to upgrade my system to 4GB of RAM. Also, due to software >> >> >> > > incompatibilities with Vista, I decided the my only real choice >> >> >> > > was >> >> >> > > Windows XP Professional x64 for my OS. I ran through the entire >> >> >> > > install, got all my drivers, everything seemed to be going >> >> >> > > well. I >> >> >> > > got >> >> >> > > my RAM today in the mail, slapped it in, checked the BIOS, and >> >> >> > > everything looked good. However, once I got into Windows, it >> >> >> > > only >> >> >> > > shows that I have 3GB >> >> >> > > available:http://i60.photobucket.com/albums/h33/danodemano/Spec.jpg >> >> >> >> > > I checked with CPUZ to make sure that it was seeing the full >> >> >> > > 4GB >> >> >> > > and >> >> >> > > it >> >> >> > > was:http://i60.photobucket.com/albums/h33/danodemano/CPUZ_RAM.jpg >> >> >> >> > > Now correct me if I'm wrong, but I had always thought that XP >> >> >> > > 64-bit >> >> >> > > supported something like 128GB of RAM....so why is my system >> >> >> > > not >> >> >> > > seeing the full 4GB???? Is there some option that I have to >> >> >> > > enable >> >> >> > > to >> >> >> > > allow Windows to use the full 4GB??? >> >> >> >> > > Any help would be appreciated, thanks!! >> >> >> >> > On my mobo, you need to get into the bios, enter control+F1, >> >> >> > which >> >> >> > adds more features to tweak. Then find "memory remap." >> >> >> >> Interesting....I will try that and let you know how it turns out. >> >> >> I >> >> >> have an HP laptop though so I don't know how much I can do with the >> >> >> BIOS. >> >> >> This is my motherboard info if that >> >> >> helps:http://i60.photobucket.com/albums/h33/danodemano/Motherboard.jpg >> >> >> > No luck.....I can't seem to get into any of the hidded options of >> >> > the >> >> > BIOS. It's propably something that HP has done to keep me from >> >> > doing >> >> > it, I'm sure..... >> >> > Grrr....guess I'm just out of luck at this point, unless someones >> >> > has >> >> > any ideas??? >> >> > They said that it doesn't support 4GB of RAM and that there was >> > nothing that they could do....the typical BS answer I'm sure. > > I thought the 32 bit MS OS couldn't span the full 32 bits, but about > 3.2G. > > Here is a microsoft link indicating 32 bit windows is limited to 3.12G > http://support.microsoft.com/kb/929605/en-us
From: Colin Barnhorst on 17 Dec 2007 02:43 btw, the 3.12GB given in the article is not a fixed number. Notice that it is only given as an example to illustrate the symptom: "For example, the System Information dialog box may report 3,120 megabytes (MB) of system memory on a computer that has 4 GB of memory installed." In theory Windows can span 4GB's of addresses. It is the conflicting needs of the OS and the hardware devices, plus the way Windows reports memory, that results in all the confusion. <miso(a)sushi.com> wrote in message news:952929db-ad85-498b-b786-54b9f5db92d1(a)s12g2000prg.googlegroups.com... > On Dec 15, 2:57 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >> It's not BS. I have a box with a mobo that refuses to support 4GB ram >> under >> Windows x64. It does support 4GB under 32-bit Windows but not 64-bit. >> It >> does happen. It is a design flaw and would take a different mobo to fix. >> >> "Dan" <Danodem...(a)gmail.com> wrote in message >> >> news:d0136760-5499-44ce-92cb-c57ab77ed669(a)b1g2000pra.googlegroups.com... >> >> > On Dec 15, 12:58 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >> >> What did HP tell you when you asked a support person? >> >> >> "Dan" <Danodem...(a)gmail.com> wrote in message >> >> >>news:7a663206-fca0-48e0-9240-d0c53ed79f66(a)w56g2000hsf.googlegroups.com... >> >> >> > On Dec 14, 5:16 pm, Dan <Danodem...(a)gmail.com> wrote: >> >> >> On Dec 14, 4:35 pm, m...(a)sushi.com wrote: >> >> >> >> > On Dec 14, 4:42 am, Dan <Danodem...(a)gmail.com> wrote: >> >> >> >> > > Windows XP Professional x64 and 4GB RAM? >> >> >> > > Alright, So with all the development and what not that I do, I >> >> >> > > decided >> >> >> > > to upgrade my system to 4GB of RAM. Also, due to software >> >> >> > > incompatibilities with Vista, I decided the my only real choice >> >> >> > > was >> >> >> > > Windows XP Professional x64 for my OS. I ran through the entire >> >> >> > > install, got all my drivers, everything seemed to be going >> >> >> > > well. I >> >> >> > > got >> >> >> > > my RAM today in the mail, slapped it in, checked the BIOS, and >> >> >> > > everything looked good. However, once I got into Windows, it >> >> >> > > only >> >> >> > > shows that I have 3GB >> >> >> > > available:http://i60.photobucket.com/albums/h33/danodemano/Spec.jpg >> >> >> >> > > I checked with CPUZ to make sure that it was seeing the full >> >> >> > > 4GB >> >> >> > > and >> >> >> > > it >> >> >> > > was:http://i60.photobucket.com/albums/h33/danodemano/CPUZ_RAM.jpg >> >> >> >> > > Now correct me if I'm wrong, but I had always thought that XP >> >> >> > > 64-bit >> >> >> > > supported something like 128GB of RAM....so why is my system >> >> >> > > not >> >> >> > > seeing the full 4GB???? Is there some option that I have to >> >> >> > > enable >> >> >> > > to >> >> >> > > allow Windows to use the full 4GB??? >> >> >> >> > > Any help would be appreciated, thanks!! >> >> >> >> > On my mobo, you need to get into the bios, enter control+F1, >> >> >> > which >> >> >> > adds more features to tweak. Then find "memory remap." >> >> >> >> Interesting....I will try that and let you know how it turns out. >> >> >> I >> >> >> have an HP laptop though so I don't know how much I can do with the >> >> >> BIOS. >> >> >> This is my motherboard info if that >> >> >> helps:http://i60.photobucket.com/albums/h33/danodemano/Motherboard.jpg >> >> >> > No luck.....I can't seem to get into any of the hidded options of >> >> > the >> >> > BIOS. It's propably something that HP has done to keep me from >> >> > doing >> >> > it, I'm sure..... >> >> > Grrr....guess I'm just out of luck at this point, unless someones >> >> > has >> >> > any ideas??? >> >> > They said that it doesn't support 4GB of RAM and that there was >> > nothing that they could do....the typical BS answer I'm sure. > > I thought the 32 bit MS OS couldn't span the full 32 bits, but about > 3.2G. > > Here is a microsoft link indicating 32 bit windows is limited to 3.12G > http://support.microsoft.com/kb/929605/en-us
From: Charlie Russel - MVP on 17 Dec 2007 14:27 Yes, I've seen this as low as 2.7 GB and as high as 3.5 GB. Depends on the hardware devices. Try putting in two 512 Mb Video cards and watch your RAM disappear. :( -- Charlie. http://msmvps.com/xperts64 http://mvp.support.microsoft.com/profile/charlie.russel "Colin Barnhorst" <colinbarharst(a)msn.com> wrote in message news:5AC1BDE8-0655-47B5-98E2-E54E97E5BD9A(a)microsoft.com... > btw, the 3.12GB given in the article is not a fixed number. Notice that > it is only given as an example to illustrate the symptom: "For example, > the System Information dialog box may report 3,120 megabytes (MB) of > system memory on a computer that has 4 GB of memory installed." In theory > Windows can span 4GB's of addresses. It is the conflicting needs of the > OS and the hardware devices, plus the way Windows reports memory, that > results in all the confusion. > > <miso(a)sushi.com> wrote in message > news:952929db-ad85-498b-b786-54b9f5db92d1(a)s12g2000prg.googlegroups.com... >> On Dec 15, 2:57 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >>> It's not BS. I have a box with a mobo that refuses to support 4GB ram >>> under >>> Windows x64. It does support 4GB under 32-bit Windows but not 64-bit. >>> It >>> does happen. It is a design flaw and would take a different mobo to >>> fix. >>> >>> "Dan" <Danodem...(a)gmail.com> wrote in message >>> >>> news:d0136760-5499-44ce-92cb-c57ab77ed669(a)b1g2000pra.googlegroups.com... >>> >>> > On Dec 15, 12:58 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >>> >> What did HP tell you when you asked a support person? >>> >>> >> "Dan" <Danodem...(a)gmail.com> wrote in message >>> >>> >>news:7a663206-fca0-48e0-9240-d0c53ed79f66(a)w56g2000hsf.googlegroups.com... >>> >>> >> > On Dec 14, 5:16 pm, Dan <Danodem...(a)gmail.com> wrote: >>> >> >> On Dec 14, 4:35 pm, m...(a)sushi.com wrote: >>> >>> >> >> > On Dec 14, 4:42 am, Dan <Danodem...(a)gmail.com> wrote: >>> >>> >> >> > > Windows XP Professional x64 and 4GB RAM? >>> >> >> > > Alright, So with all the development and what not that I do, I >>> >> >> > > decided >>> >> >> > > to upgrade my system to 4GB of RAM. Also, due to software >>> >> >> > > incompatibilities with Vista, I decided the my only real >>> >> >> > > choice >>> >> >> > > was >>> >> >> > > Windows XP Professional x64 for my OS. I ran through the >>> >> >> > > entire >>> >> >> > > install, got all my drivers, everything seemed to be going >>> >> >> > > well. I >>> >> >> > > got >>> >> >> > > my RAM today in the mail, slapped it in, checked the BIOS, and >>> >> >> > > everything looked good. However, once I got into Windows, it >>> >> >> > > only >>> >> >> > > shows that I have 3GB >>> >> >> > > available:http://i60.photobucket.com/albums/h33/danodemano/Spec.jpg >>> >>> >> >> > > I checked with CPUZ to make sure that it was seeing the full >>> >> >> > > 4GB >>> >> >> > > and >>> >> >> > > it >>> >> >> > > was:http://i60.photobucket.com/albums/h33/danodemano/CPUZ_RAM.jpg >>> >>> >> >> > > Now correct me if I'm wrong, but I had always thought that XP >>> >> >> > > 64-bit >>> >> >> > > supported something like 128GB of RAM....so why is my system >>> >> >> > > not >>> >> >> > > seeing the full 4GB???? Is there some option that I have to >>> >> >> > > enable >>> >> >> > > to >>> >> >> > > allow Windows to use the full 4GB??? >>> >>> >> >> > > Any help would be appreciated, thanks!! >>> >>> >> >> > On my mobo, you need to get into the bios, enter control+F1, >>> >> >> > which >>> >> >> > adds more features to tweak. Then find "memory remap." >>> >>> >> >> Interesting....I will try that and let you know how it turns out. >>> >> >> I >>> >> >> have an HP laptop though so I don't know how much I can do with >>> >> >> the >>> >> >> BIOS. >>> >> >> This is my motherboard info if that >>> >> >> helps:http://i60.photobucket.com/albums/h33/danodemano/Motherboard.jpg >>> >>> >> > No luck.....I can't seem to get into any of the hidded options of >>> >> > the >>> >> > BIOS. It's propably something that HP has done to keep me from >>> >> > doing >>> >> > it, I'm sure..... >>> >> > Grrr....guess I'm just out of luck at this point, unless someones >>> >> > has >>> >> > any ideas??? >>> >>> > They said that it doesn't support 4GB of RAM and that there was >>> > nothing that they could do....the typical BS answer I'm sure. >> >> I thought the 32 bit MS OS couldn't span the full 32 bits, but about >> 3.2G. >> >> Here is a microsoft link indicating 32 bit windows is limited to 3.12G >> http://support.microsoft.com/kb/929605/en-us >
From: Colin Barnhorst on 17 Dec 2007 15:02
Yes, most of the folks with shockingly low numbers have SLI boards (I presume Crossfire does the same). "Charlie Russel - MVP" <charlie(a)mvKILLALLSPAMMERSps.org> wrote in message news:E1886837-AFFB-47EF-B141-1760745EEE2A(a)microsoft.com... > Yes, I've seen this as low as 2.7 GB and as high as 3.5 GB. Depends on the > hardware devices. Try putting in two 512 Mb Video cards and watch your RAM > disappear. :( > > -- > Charlie. > http://msmvps.com/xperts64 > http://mvp.support.microsoft.com/profile/charlie.russel > > > "Colin Barnhorst" <colinbarharst(a)msn.com> wrote in message > news:5AC1BDE8-0655-47B5-98E2-E54E97E5BD9A(a)microsoft.com... >> btw, the 3.12GB given in the article is not a fixed number. Notice that >> it is only given as an example to illustrate the symptom: "For example, >> the System Information dialog box may report 3,120 megabytes (MB) of >> system memory on a computer that has 4 GB of memory installed." In >> theory Windows can span 4GB's of addresses. It is the conflicting needs >> of the OS and the hardware devices, plus the way Windows reports memory, >> that results in all the confusion. >> >> <miso(a)sushi.com> wrote in message >> news:952929db-ad85-498b-b786-54b9f5db92d1(a)s12g2000prg.googlegroups.com... >>> On Dec 15, 2:57 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >>>> It's not BS. I have a box with a mobo that refuses to support 4GB ram >>>> under >>>> Windows x64. It does support 4GB under 32-bit Windows but not 64-bit. >>>> It >>>> does happen. It is a design flaw and would take a different mobo to >>>> fix. >>>> >>>> "Dan" <Danodem...(a)gmail.com> wrote in message >>>> >>>> news:d0136760-5499-44ce-92cb-c57ab77ed669(a)b1g2000pra.googlegroups.com... >>>> >>>> > On Dec 15, 12:58 pm, "Colin Barnhorst" <colinbarha...(a)msn.com> wrote: >>>> >> What did HP tell you when you asked a support person? >>>> >>>> >> "Dan" <Danodem...(a)gmail.com> wrote in message >>>> >>>> >>news:7a663206-fca0-48e0-9240-d0c53ed79f66(a)w56g2000hsf.googlegroups.com... >>>> >>>> >> > On Dec 14, 5:16 pm, Dan <Danodem...(a)gmail.com> wrote: >>>> >> >> On Dec 14, 4:35 pm, m...(a)sushi.com wrote: >>>> >>>> >> >> > On Dec 14, 4:42 am, Dan <Danodem...(a)gmail.com> wrote: >>>> >>>> >> >> > > Windows XP Professional x64 and 4GB RAM? >>>> >> >> > > Alright, So with all the development and what not that I do, >>>> >> >> > > I >>>> >> >> > > decided >>>> >> >> > > to upgrade my system to 4GB of RAM. Also, due to software >>>> >> >> > > incompatibilities with Vista, I decided the my only real >>>> >> >> > > choice >>>> >> >> > > was >>>> >> >> > > Windows XP Professional x64 for my OS. I ran through the >>>> >> >> > > entire >>>> >> >> > > install, got all my drivers, everything seemed to be going >>>> >> >> > > well. I >>>> >> >> > > got >>>> >> >> > > my RAM today in the mail, slapped it in, checked the BIOS, >>>> >> >> > > and >>>> >> >> > > everything looked good. However, once I got into Windows, it >>>> >> >> > > only >>>> >> >> > > shows that I have 3GB >>>> >> >> > > available:http://i60.photobucket.com/albums/h33/danodemano/Spec.jpg >>>> >>>> >> >> > > I checked with CPUZ to make sure that it was seeing the full >>>> >> >> > > 4GB >>>> >> >> > > and >>>> >> >> > > it >>>> >> >> > > was:http://i60.photobucket.com/albums/h33/danodemano/CPUZ_RAM.jpg >>>> >>>> >> >> > > Now correct me if I'm wrong, but I had always thought that XP >>>> >> >> > > 64-bit >>>> >> >> > > supported something like 128GB of RAM....so why is my system >>>> >> >> > > not >>>> >> >> > > seeing the full 4GB???? Is there some option that I have to >>>> >> >> > > enable >>>> >> >> > > to >>>> >> >> > > allow Windows to use the full 4GB??? >>>> >>>> >> >> > > Any help would be appreciated, thanks!! >>>> >>>> >> >> > On my mobo, you need to get into the bios, enter control+F1, >>>> >> >> > which >>>> >> >> > adds more features to tweak. Then find "memory remap." >>>> >>>> >> >> Interesting....I will try that and let you know how it turns out. >>>> >> >> I >>>> >> >> have an HP laptop though so I don't know how much I can do with >>>> >> >> the >>>> >> >> BIOS. >>>> >> >> This is my motherboard info if that >>>> >> >> helps:http://i60.photobucket.com/albums/h33/danodemano/Motherboard.jpg >>>> >>>> >> > No luck.....I can't seem to get into any of the hidded options of >>>> >> > the >>>> >> > BIOS. It's propably something that HP has done to keep me from >>>> >> > doing >>>> >> > it, I'm sure..... >>>> >> > Grrr....guess I'm just out of luck at this point, unless someones >>>> >> > has >>>> >> > any ideas??? >>>> >>>> > They said that it doesn't support 4GB of RAM and that there was >>>> > nothing that they could do....the typical BS answer I'm sure. >>> >>> I thought the 32 bit MS OS couldn't span the full 32 bits, but about >>> 3.2G. >>> >>> Here is a microsoft link indicating 32 bit windows is limited to 3.12G >>> http://support.microsoft.com/kb/929605/en-us >> > |