Not all physical ram available for use

February 8, 2011 at 10:15:23
Specs: Windows XP
my system infomation is given below

OS Name Microsoft Windows XP Home Edition
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
Activation Status Activation Pending (30 days remaining)
System Name ISHU-CDFFE74E6C
System Manufacturer GBT___
System Model AWRDACPI
System Type X86-based PC
Processor x86 Family 15 Model 4 Stepping 1 GenuineIntel ~2533 Mhz
BIOS Version/Date Award Software International, Inc. F2, 9/16/2005
SMBIOS Version 2.3
Windows Directory D:\WINDOWS.0
System Directory D:\WINDOWS.0\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name ISHU-CDFFE74E6C\New user
Time Zone India Standard Time
Total Physical Memory 768.00 MB
Available Physical Memory 112.56 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 890.38 MB
Page File D:\pagefile.sys


i had 768 mb( 512+256 mb ddr) ram installed in my pc but my system is BIOS is showing only 368 mb ram, i looked to change it in BIOS but unable yo find any option where i can do that . can any 1 help me in solving this problem


See More: Not all physical ram available for use

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#1
February 8, 2011 at 10:40:28
Did you just install some or all of that RAM? You can't make any change in the BIOS to increase the amount of installed RAM. Either the BIOS recognizes and configures the RAM or it doesn't.

Where are you getting the 368 number from?

Keep in mind that many computers use integrated graphics chips that reserve some of the system memory for their use. That, however, would not account for the short fall you are seeing.

If the RAM used to work then you could try re-seating the RAM. Snap each module in and out 4 or 5 times to burnish the contacts.

Be sure to have the power to the motherboard interrupted before attempting this. If your power supply has an on/off switch on it then switch to the off position. Otherwise unplug the computer.

Be sure to exercise proper anti-static precautions by grounding yourself prior to touching anything inside the case. The computer case is grounded if the power cord is plugged into a properly grounded receptacle.


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#2
February 8, 2011 at 11:03:46
"Where are you getting the 368 number from?"

The info you supplied states:

"Total Physical Memory 768.00 MB"

Did you gather that info in Windows by copying currently generated info just before you posted this Topic, or previously ?

If you gathered that info just before you posted this Topic, Windows is seeing all of the installed ram.


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#3
February 8, 2011 at 11:43:01
Notice this:

"Activation Status Activation Pending (30 days remaining)
Windows Directory D:\WINDOWS.0
System Directory D:\WINDOWS.0\system32"

Apparently the OP just reinstalled Windows (possibly attempted a repair?) but rather than overwriting the original Windows folder, allowed it to install to "windows.0". Yikes!

Other than that, 768MB RAM should be available to Windows. Even if onboard video is being used, it sure as heck wouldn't use 400MB. Windows is showing ALL the RAM - "Total Physical Memory 768.00 MB" - so I don't see what the problem is?


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Related Solutions

#4
February 8, 2011 at 12:07:57
I guess I should have read all that list. "Total Physical Memory 768.00 MB" Windows itself states the RAM is 768MB.

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#5
February 9, 2011 at 09:22:58
in system properties,system is showing only 368mb ram , but i noticed that if i use only 256 mb ram alone system use full 256 mb ram , but if i use 512 mb ram alone it shows only 368 mb ram , and if i use both of them together then again it shows 368 mb ram .
earlier i used 2 X 256 mb ram and my system detected full 512 mb ram.


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#6
February 9, 2011 at 10:51:40
Your stick of 512MB RAM may not be compatible with the memory controller. Download SIW from the link below to determine the specs on all your installed RAM. Then go to the second link below and use the online configurator to determine what type and how much RAM is compatible with your system.

http://www.gtopala.com/siw-download...

http://www.crucial.com/systemscanner/


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#7
February 9, 2011 at 12:26:23
Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT all the way with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard's main chipset, or in the case of recent mboards, compatible with the memory controller built into the cpu.

See response 5 in this for some info about ram compatibilty, and some places where you can find out what will work in your mboard for sure:
http://www.computing.net/hardware/w...
Correction to that:
Mushkin www.mushkin.com

Once you know which module ID strings (part numbers) work in your mboard, you can get them from anywhere you like that has ram with those ID strings.

If you have brand name ram, it is usually easy to look up whether it's ID string (part number) is in a list of compatible modules found by using your mboard or brand name system model number.
If the ram is generic, that may be difficult or impossible.
.....

On top of that, 368mb is an oddball amount for a mboard that is not using onboard video - it would more likely be 256mb if it was just the 512 module not being 100% compatible. The 512mb module is probably damaged.

ATX mboards have power in some places, including some of the contacts in the ram slots, even when the computer is NOT running, as long as the ATX PS is connected to the mboard and the PS is receiving live AC power.
ALWAYS disconnect the AC power to the computer case when fiddling with any connection or component inside the computer case !
.....


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#8
February 11, 2011 at 06:21:40
this is my system information SIW SOFTWARE

QuickReport from System Information for Windows (http://www.gtopala.com) Friday, February 11, 2011

System Vendor
Manufacturer
Serial Number
Model

BIOS Information
Vendor Award Software International, Inc.
Version F2
Board Product ID 8I865GVMK-775

Processor Information
Summary 1 Physical Processors / 1 Cores / 1 Logical Processors / 64 bits
Name Intel(R) Celeron(R) CPU 2.53GHz
Vendor GenuineIntel
Original System Clock 133 MHz

Storage Device Information
Disk 0 80.0 GB ST380011A Seagate

Memory Information
Slot 1 DDR (PC3200) 512 MBytes Smart Modular
Slot 2 DDR (PC3200) 256 MBytes

Display Adapter Information
Intel(R) 82865G Graphics Controller 96 MBytes

Sound Adapter Information
SoundMAX Integrated Digital Audio Analog Devices, Inc.

Network Adapter Information
Intel(R) PRO/100 VE Network Connection WIRED Connected [100 Mbps]

Operating System
Type Windows XP Personal Service Pack 3
................................................................................................................................................................................................................................................................

THIS IS MY SYSTEM SUMMARY

Property Value
Manufacturer
Version
Serial Number
Machine Type AT/AT COMPATIBLE
Infrared (IR) Supported No
DMI System UUID FFFFFFFF-FFFFFFFF-FFFFFFFF-FFFFFFFF
UUID FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF

Disk Space Disk C: 3190 MB Available, 19085 MB Total, 3190 MB Free
Disk D: 1345 MB Available, 29996 MB Total, 1345 MB Free
Disk E: 3883 MB Available, 27214 MB Total, 3883 MB Free

Physical Memory 368 MB Total, 145 MB Free
Memory Load 60%

Virtual Memory 891 MB Total, 545 MB Free

PageFile Name D:\pagefile.sys
PageFile Size 552 MB
In use 96 MB
Max used 96 MB
Registry Size 2 MB (current), 54 MB (maximum)

Profile GUID {d4945140-3313-11e0-b071-806d6172696f}

The system clock interval 15 ms
..
PLSS CHECK AND HELP.....


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#9
February 11, 2011 at 06:53:13
SIW

"Memory Information
Slot 1 DDR (PC3200) 512 MBytes Smart Modular
Slot 2 DDR (PC3200) 256 MBytes"

System summary

"Physical Memory 368 MB Total, 145 MB Free"

All modern ram modules have a tiny chip on one end of the module, often near the top of it, in which SPD (Serial Presence Detect) info is stored.
The ram manufacturer is supposed to specify info on that that tells the mboard's bios what capacity the ram has and other things, such as, in this case, that it's PC3200 - DDR 400mhz - ram.

SIW is probably reading the the SPD information on the modules. Other programs such as CPU-Z do that too.

At least one of your ram modules, probably the 512mb one, is either damaged or it's not 100% compatible with being used in your mboard, so the bios and Windows is detecting less memory on the modules than the nominal values of the modules.

In some cases, you get oddball amounts of ram being detected only when more than one module is is installed if any of them are not 100% compatible.

The only cure for that is to use ram modules that are 100% compatible with being used in your mboard !


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#10
February 11, 2011 at 07:06:08
Did you actually click on the Memory listing under hardware in SIW? If so, and the above is all the information shown, then I agree with the above post.

Go to the link below and use it to determine the correct RAM. I suggest you try it twice. Once with all your present RAM installed and once with only the 256MB stick.

The fact that the BIOS is reading the correct amount of RAM is puzzling.

I suggest you snap the RAM modules in and out 4 or 5 times each to burnish the contacts. Be sure to have the computer unplugged when doing that. If nothing changes then I think the 512MB module is either damaged or incompatible with your motherboard.

Most RAM has a lifetime warranty. You may be able to get a replacement.

Do you know if the 512MB stick ever worked right in your computer?


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#11
February 11, 2011 at 07:53:50
OtheHill

You referred to a link you didn't provide in response 10.

"The fact that the BIOS is reading the correct amount of RAM is puzzling."

He said in the first post it's recognizing 368.

He has that info in the first post that shows 768mb was being detected at at one time, but when? When which ram modules were installed ?


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#12
February 11, 2011 at 08:09:29
Tubes

The links were in #6 above

In the original post the line near the bottom reads "Total Physical Memory 768.00 MB"

The only way that reading could happen is with both the 256MB & 512MB modules installed. It appears the BIOS is reading SPD information off the module. Some of the actual chips may be damaged, the module isn't fully seated, the module isn't making good contact, or the module is incompatible. I don't think the issue is incompatibility.

ishan

Have you tried installing the modules in a different order? Be sure to use the first slot though.


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#13
February 11, 2011 at 08:12:39
I don't think that that's the case.
He also said in that first post the bios was detecting 368.
He probably gathered that info and saved it when he had other ram installed, or he gathered it when the same modules were installed BEFORE the 512mb was damaged

His info in response 5 probably indicates at least the 512mb module is incompatible or it's damaged.


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#14
February 11, 2011 at 08:34:09
I think it unlikely that ishan would remove one 512MB stick and replace it with another 512MB stick. More likely he would replace the 256MB stick if a second 512MB were available.

More likely the module may have been damaged. Possibly by tampering while the motherboard had power to it. We don't have all the information here.


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#15
February 11, 2011 at 09:32:48
this info i got from CRUCIAL
Maximum Memory Capacity: 4194304 MB
Currently Installed Memory: 768 MB
Available Memory Slots: 2
Total Memory Slots: 4
Dual Channel Support: N.A.
CPU Manufacturer: GenuineIntel
CPU Family: Intel(R) Celeron(R) CPU 2.53GHz Model 4, Stepping 1
CPU Speed: 2532 MHz

asnother info i got from SIW

MEMORY SUMMERY 4096 MB
DRAM FREQUENCY 166.7 Mhz
MEMORY TIMING 3-3-3-7 (CL-RCD-RP-RAS)

RAM 1 ( 512 MB)
SPEED 200MHZ
SUPPRTED FREQUENCY 133.3 ,166.7 ,200 MHZ
MEMORY TIMING 2-2-2-6-0 AT 133.3 MHZ 2.5 V (CL-RCD-RP-RAS-RC)
MEMORY TIMING 2-3-3-7-0 AT 166.7 MHZ 2.5 V (CL-RCD-RP-RAS-RC)
MEMORY TIMING 3-3-3-8-0 AT 200 MHZ 2.5 V (CL-RCD-RP-RAS-RC)
DATA WIDTH 64 BITS

RAM2 ( 256 MB)
SPEED 200MHZ
SUPPRTED FREQUENCY 200 MHZ
MEMORY TIMING 2-3-3-8-0 AT 200 MHZ 2.5 V (CL-RCD-RP-RAS-RC)
DATA WIDTH 64 BITS


I CHANGED THE SLOTS OF RAMS ALREADY BUT NO RESULT , I TRIED EVERY COMBINATION BUT STILL SAME THING HAPPENS AS TOLD U GUYS EARLIER IN ( REPLY 5)


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#16
February 11, 2011 at 10:44:18
Try downloading memtest86 and follow the instructions. No memory error are acceptable.

http://www.memtest.org/


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#17
February 11, 2011 at 10:46:08
Both of those are probably reading the SPD info on the modules !

The bios SHOULD detect 768mb total but it's detecting 368 !

If it doesn't matter which ram slots you place the ram in you get 368mb total, then your ram slots and their circuits are probably not damaged. Your response 5 probably indicates the 512mb module is probably either incompatible with this mboard or it's damaged !.


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#18
February 11, 2011 at 11:16:37
but why if both ram used together shows same result as 512 mb ram used alone ?

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#19
February 11, 2011 at 11:32:42
Probably because the 512mb module is damaged, or less likely, it's not compatible with being installed in this mboard !
If it were incompatible it would a lot more likely be detected by the bios as 256mb, or some even multiple of 64, not the oddball 368mb (384 - 16) .
If it can't be recognized properly by the bios then it may not be recognized properly along with other modules, or other modules may not be recognized when it's installed. There is no way to predict how a bios / the mboard's memory controller will respond to a damaged module, or an incompatible module

ATX mboards are always being powered in some places, including some of the contacts in the ram slots, even when the computer is NOT running, as long as the ATX power supply is connected to the mboard and the PS is receiving live AC power.
You are ALWAYS supposed to remove the AC power to the case / the PS whenever you fiddle with any connection or component inside the case.

It's quite likely you didn't do that at some point and you damaged the 512mb module.

If it's damaged, it will probably NOT be detected as 512mb in ANY mboard's bios !


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#20
February 13, 2011 at 01:28:48
guys now i just replaced my 512 mb ram by 2x256 mn ram but no change system still shows 368 mb ram , now i m confused wat do

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#21
February 13, 2011 at 06:16:49
What shows in the POST screens at start up?

You have 4 RAM slots on your board don't you? Try using the other two an see what happens.


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#22
February 13, 2011 at 06:38:06
You are ALWAYS supposed to remove the AC power to the case / the PS whenever you fiddle with any connection or component inside the case.
Have you been doing that at ALL times ?

Are these the same two 256mb modules you stated in response 5 that 512mb was shown for when both were installed?
If so, one of your ram slots probably has damaged circuits.

Try each module in each slot individually.
Then try the pair of them in various pairs of the 4 slots.
E.g.
module 1, module 2 in
1 + 2, 1 + 3, 1 + 4, 2 + 3, 2 + 4, 3 + 4
if the modules are not the same part number, then
module 2, module 1 in
1 + 2, 1 + 3, 1 + 4, 2 + 3, 2 + 4, 3 + 4


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#23
February 13, 2011 at 08:43:28
thanks guys its working now after using some differen combination of slots finally they are working on slot 2,3,4 .can any one tell me how the change of slots had any impact of detecting my ram.......

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#24
February 13, 2011 at 09:49:29
As tubesandwires stated, your #1 slot must be damaged. Probably from messing with the modules while the computer was plugged in.

The contacts that read the SPD data are working but some of the others are not. If you examine the slot with a light and magnifying glass, you may find signs of arking or burning.


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#25
February 13, 2011 at 11:17:16
Hooray !
You figured out the problem !

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