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Another RAM question

By vale46
Feb 7, 2009
Topic Status:
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  1. Hi all, thanks for taking the time to read this post.
    I have windows 32bit Vista and 3 gig of DDR 2 ram, 1x2gig and 1x1gig strips.
    I basically got another 2gig strip for nothing so i thought i would swap the 1gig for it and max out the system with 4gig.
    My pc has the service pack 1 for vista on it so upon installing the RAM my pc can now detect i have 4GIG and clearly says so in the "My Computer properties" but...................
    When i had 3 gig, the task manager window stated i had 3069mb physical memory, now that i have 4 gig it states i only have 3005mb of physical memory !!
    Now to me thats a loss but then i dont know what i am on about either lol
    I appreciate my system wont use 4gig and probably MIGHT only use upto 3.5gig of the 4gig installed but why has the physical ram value gone down by 64mb !! ??
    Hope someone can shed a bit of light on this for me.
    Regards,
    Vale.

    P.S. The new 2gig ram strip matches exactly the 2gig original strip.
     
  2. Tedster

    Tedster Techspot old timer..... Posts: 10,074   +13

    32 bit operating systems are limited to max capacity of 4 gb. After Windows eats it's share you'll see a max of around 3.5

    There is no way to get around this. If you wish to use humongous amounts of ram, upgrade to a 64 bit flavor of an OS like XP 64, or Vista 64 or Windows server 64.
     
  3. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Thanks Tedster for the reply......i knew this !!! you HAVEN'T answered my question lol
    Cheers.
     
  4. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    Hi Vale,
    there are a couple of things in play here. first the new 2gb stick is different than the 1gb stick, and reads it differently. secondly when you replaced the 1gb with the 2gb stick you probably activated dual channel mode. depending on what configuration of ram i put in my machine (with a 32 bit OS) it will see anywhere between 3.2 and 3.45 gb of ram when I have 4gb installed.
     
  5. Tedster

    Tedster Techspot old timer..... Posts: 10,074   +13

    this is because the stick of ram is addressed as a block. Since the sizes of the sticks are different, the amount that can be addressed over the OS limit is adjusted.

    cheers for what? Buy'n me a beer? ;)
     
  6. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    OK, i sort of already knew about the maximum amount i could expect....its the 65mb loss that i need an answer on !?
    I guess i didnt make myself clear doh !!!! why have i lost 65mb of physical memory by installing 1gig of extra ram ???
    If you answer me that i will buy you a beer lol
    ;)
     
  7. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    when you bumped your system up to 4gb of ram, you triggered.'memory mapped IO reservations'. its an chipset arcitectural design with 32 bit os's.newer chipsets support memory remapping with 64 bit os's and do not have this limitation. your memory is there but part of it is masked because it has been designated for hardware in your system including bios,pci bus,pcie and other devices installed, and is not availible for working memory. how much gets reserved depends on what devices you have installed,and your chipset and bios. depending on those items you will see physical working memory reported of 2.75gb-3.5gb. ...........I prefer Killians Vale..:)
     
  8. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Thanks red1776, i dont know what killians is lol, but please can you explain why i am missing 64mb of physical ram since i have added 1gig of extra ram!!!!
    I must be missing something in your answers....have you answered why i am missing the ram since upgrading or am am just not getting it ?
    I thought i would see my physical ram got from 3069mb to some where around 3500mb max but instead i had lost 64mb even though my system tells me i have 4gig installed !!!
    AARRGGHHHHHH please help me understand where the 64mb went ?
    hahahaha
     
  9. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    likely shared Video memory in system Bios
    You can access your Bios settings from originally turning on your computer and pressing a certain key (usually DEL)
     
  10. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    i think what you cant get past is that you added more ram....and have been left with less working memory. when you had 3gb of ram, 'memory mapped I0 reservation' was not enacted....so it reported all of your ram as working memory, and it was. but when you put the maximum amount of ram (4gb) on your system, MMI0 was 'enacted for lack of a better term. and it reassigned over 1gb of ram (included in there is your missing 64mb) to system hardware leaving you with only 3005mb of 'working' memory. i know it doesnt make much sense to add more ram and be left with less reported,or working memory,..but thats the way it is. ....oh yeah....killians is a lager.
     
  11. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Cool, so i guess the point is, reported or not do i actually have more ram now with 4gig then i did with 3 gig ? and is there any settings / configurations i can do to optimise this if any at all extra ram, like kimsland said, is there something in the bios i can manually set higher ?

    I know i am been a pain, but unless you ask you never know lol

    Oh and red, i am more a stella man, never heard of killians lol :) cheers all the same peeps.

    All your input is appreciated. Thanks ;)
     
     
  12. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    Yes you have more Ram. Probably not massively noticeable on update from 3Gig to 4 Gig. Do you see a difference? (it would be interesting to know :) )
     
  13. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    yes you do, some of it is hidden though in the hardware assignment. the reality is that anything over 2-2.5gb on a 32 bit os is not going to have a noticable performance increase, that has been documented. the more important issue is to make sure its running in dual channel, that you will notice a 10-15% overall system
    performance gain.

    Cheers Vale :)
     
  14. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    red1776's answers are better than mine :(
     
  15. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    well i have to get ya once in a while Kim....:)

    doesnt happen too often
     
  16. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Hey MASSIVE thanks peeps for the input. as far as performance goes...YES i have noticed a difference, not massive......just different, things open more instantly, what i mean is, the window/page just pops into view rather then a split second animated opening if you follow.
    I use a few ram hungry 3D programs like 3DsMAX, VUE and Poser so untill i do some intensive rendering i wont know exactly how much difference the extra ram has made, at the end of the day for £20 anythig extra is a bonus lol

    1 last question peeps, how do i check its running in dual band or is it the fact that i only have 2 ram slots and both those slots have exactly the same ram modules in them that clarifies it is now running in dual band ?
     
  17. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    hey vale,
    if you have them in the correct slots,they should be running in dual mode. but download this little,yet very useful tool and it will tell you.

    http://www.cpuid.com/cpuz.php

    (geez....i have to watch my spelling!):haha:
     
  18. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Wow, thanks red, this is really healpfull mate.....i mean it..thank you.
    I copied the cpuz file cos the only thing i can see regarding the ram is single channel....what do you see ?
    i have uploaded it for your knowledigble inspection lol ight need to check my spelling now.

    What do you think of the cpuz file ?
     
  19. red1776

    red1776 Omnipotent Ruler of the Universe Posts: 5,897   +88

    any time mate,
    yeah it says its running @ 64 bit bandwidth...should be 128. the most obvious question is are the modules identical? if they are,check to see if your motherboard dual channel is set up as
    1&2 3&4, or 1&3 and 2&4. know what i mean?
     
  20. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    no, i dont know what you mean mate, how do i check that ?
     
  21. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    Code:
    DIMM #1
    
    General
    Memory type		DDR2
    Module format		Regular UDIMM
    Manufacturer (ID)	[B]Micron Technology[/B] (2C00000000000000)
    Size			2048 MBytes
    Max bandwidth		PC2-5300 (333 MHz)
    
    
    DIMM #2
    
    General
    Memory type		DDR2
    Module format		Regular UDIMM
    Manufacturer (ID)	[B]Crucial Technology[/B] (7F7F7F7F7F9BFFFF)
    Size			2048 MBytes
    Max bandwidth		PC2-5300 (333 MHz)
    Crucial System Scanner tool
    [​IMG]
     
  22. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    the ram modules are both identical in secification just different makes. i went to a lot of trouble to get the new 2gig stick to match the original lol so i just need to know how to change the mobo thing your on about ;)

    Cheers red.
     
  23. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    looks like only 2 Dimm slots
     
  24. vale46

    vale46 TS Rookie Topic Starter Posts: 206

    Thanks Kim, i did a scan and it couldnt determine all the nessasary info but it did come up with this..

    Maximum Memory Capacity: 1048576 MB
    Currently Installed Memory: N.A.
    Available Memory Slots: 2
    Number of Banks: 2
    Dual Channel Support: N.A.
    CPU Manufacturer: GenuineIntel
    CPU Family: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz Model 15, Stepping 11
    CPU Speed: 2400 MHz



    ??? what do you reckon ?

    i did say i only had 2 ram slots ? is this nothing to do with DIMM things ? ;)
     
  25. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    Hi, sorry for delay, I suspect red1776 is better answering anyway
    But please download your motherboard (or computer branded) manual, and confirm if "Dual Channel" is an option (it may not be :( )

    oh he just did :/
     
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