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Total amount of RAM not recognized by computer

Under ''System Properties'', it says that my computer only has 1GB of memory installed. I have four RAM slots, 2 groups of 2 on the motherboard. My computer came with 512MB of RAM, 2 sticks of 256MB. These 2 256MB sticks came installed on the first slots of both groups on the motherboard, not beside each other. I bought 2 512MB sticks and installed them into the 2 other slots on my motherboard. My computer works great, but I want it to recognize the full 1.5 GB of memory that I have.

My motherboard can recognize up to 2GB of RAM, so I know that should not be the problem. As a troubleshooting tactic of my own, I took all of the memory sticks out and only replaced the 2 512mb sticks right beside each other in the same group. I restarted my computer and it said I only had 512mb of memory. Does this mean a slot or two on my motherboard is not working???

Also, I do not have onboard video memory, it is a seperate AGP card.

If anyone can provide some insight that would be great!

My computer is a Sony Vaio desktop, PCV-RS620G

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  • blackhawk3x Jul 14, 2009

    OK, I will try the second thing. Unfortunately, this is a Vaio, so the motherboard is proprietary hardware, so no spec sheet or manual. I will be sure to double check the type of RAM as well, see if the specs match

  • blackhawk3x Jul 14, 2009

    I tried your suggestion in the comment, but it still says 1GB total. Do you think this is due to "memory mapped IO reservations"? I was researching online and apparently the computer can use this to set aside some memory for internal use, and make it not available for the user.

    I also checked the compatibility between the two different sets of memory. They are both exactly the same (184pin 400MHz DDR PC3200). The only difference is that the two 256 memory sticks are CL2.5, and the two 512 sticks are CL3. Any more suggestions?

  • blackhawk3x Jul 14, 2009

    Hehe, well the funny thing is, is that the cas2.5 sticks (the 256mb ones) were the ones installed from the factory. The cas3 memory units are the aftermarket 512mb sticks. My motherboard, come to find out after using Crucial.com, has paired memory slots: 1 and 3 are paired, and 2 and 4 are paired. If the 512mb sticks are in 1 & 3, and the 256mb sticks are in 2 & 4, would the fact that the sticks having different cas levels really make that big of a difference?

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  • 202 Answers

Are the modules the same specs? you may have some incompatibality between them. the board may be reading the ram right it may be you have four 256 sticks instead of 2 of each. read the motherboard manual it might shed some light here.

Posted on Jul 13, 2009

  • 1 more comment 
  • dewey wyatt Jul 13, 2009

    try this, you should have the largest module in the 0 0r 1 slot meaning the closest slot to the processor try the 512 in the 1 and three and the 256 in 2 and 4. just remembered this one from an aopen mb.

  • dewey wyatt Jul 14, 2009

    cl cas latency shuldn't be mixed they should be the same, the exception to this is some asus motherboards us a slot system if they are not identical. is the memory counting correctly on post? if you want you can try only using the 2 512's in different slots to see if they will read, also possible you have gotten two sticks that are only 256 and marked 512. do you have access to another laptop that uses the ddr 400 sims? try it in another machine and see if it reads, you also could have one bad stick. i am going to look up the laptop now and see if i can find any thing else.

  • dewey wyatt Jul 14, 2009

    tried to find something on it and all i found is it uses cas3 ddr dimms, somehow i had laptop on the brain was the reason i put sodimm, it is dimm and the specs say cas 3. it might not read the 2.5's correctly.other than this i am at a loss, it was all i found and they have the usuall precautions about using the genuine memory sticks, etc.

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1 Answer

HOW MUCH DDR2 MEMORY FOR LAPTOP


Referring to a Toshiba Satellite Pro L300 series of Notebook PC:

According to the Service Manual;

1) The Maximum Total Amount of Ram Memory depends on the Northbridge chipset used.
(System Controller. Intel)

If it is an Intel GM965 chipset, the maximum total amount is 4GigaByte. (4GB)
If it is an Intel GL960 chipset, the maximum total amount is 2GB.

Northbridge chipset (Or System Controller)

The Northbridge chipset was aptly named so, because of the general location of the chipset on the motherboard.
It is generally located under the Processor.

(The Southbridge chipset is located further 'South' on the motherboard)

The Northbridge chipset handles the faster capabilities of the computer.
It handles the Processor, Ram Memory, and High-Speed graphics.

High-speed graphics being AGP or PCI-Express.
Integrated Graphics, or a graphics card installed into a PCI slot is NOT high-speed graphics.

This is handled by the Southbridge chipset.
The Southbridge chipset handles the slower capabilities of the computer.

Motherboard diagram;

http://en.wikipedia.org/wiki/File:Motherboard_diagram.svg

Information on the Northbridge (computing),

http://en.wikipedia.org/wiki/Northbridge_%28computing%29


Information on the Intel GM965, and GL960 chipset,

http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Core_2_Mobile_chipsets

Look under the heading Chipset at GL960.
Looking across you can see that the chipset supports;

1) DDR2 Sdram that is either 533MegaHertz, or 677MHz. (SO-DIMM ram memory for laptops)
2) Supports up to 3GB

[ Your laptop has TWO ram memory slots. The primary, or Main ram memory slot, (Outside edge), and the Optional ram memory slot, (Inside towards the middle)

There are No 1.5GB ram memory modules. ('Stick')
This is why 2GB is the maximum with the Intel GL960 chipset.

Install one 2GB ram memory module in the Main ram memory compartment,
OR,
Install one 1GB ram memory module, in the main ram memory compartment, and one 1GB ram memory module in the Optional ram memory compartment ]


Now look under the Chipset heading at GM965.
1) Supports DDR2 Sdram at either 533MHz, or 677MHz.
2) Supports up to 4GB.

How to know what Northbridge (System Controller) chipset your laptop uses?
Use CPU-Z from CPUID.com

Information on CPU-Z on Wikipedia,

http://en.wikipedia.org/wiki/CPU-Z


CPU-Z,

http://www.cpuid.com/softwares/cpu-z/versions-history.html

If you need guidance in downloading, installing, and using CPU-Z, hit me up in a Comment.

Download page for the free Service Manual, for the Toshiba Satellite Pro L300 series of Notebook PC's,

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-toshiba

Scroll down with your eyes to the heading - Satellite Pro
Go across, and click on - L300

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on - L300 - it may take up to 30 seconds before you will see the first page come up.
It may also take additional time for the file to fully download.

Have questions I'm right here.

{Now you know Why, How, and Where.
You can tell your friends about your new found knowledge}

Regards,
joecoolvette

Jul 12, 2011 | Toshiba Satellite Pro L300 Notebook

2 Answers

If i change the ram stick will my pc reconise it


Yes.

Provided,
1) It is no more than the maximum amount, for that ram memory slot.

2) Adding it, will not go over the Maximum Total Amount for the motherboard.

If this pertains to an Acer Aspire T135 desktop computer,

A) The Maximum Total Amount is 2GB.

B) The Maximum Amount for Each ram memory slot is 1GB.

C) PC3200 is the best you can use.
DDR Sdram at 400MegaHertz. (400MHz)

[It can also use PC2100, and PC2700.

DDR Sdram at 266MHz, and DDR Sdram at 333MHz, respectively ]

Once you install the ram memory, BIOS should automatically find it.

If you are only going to use one ram memory module, be sure to put it in Slot 1.
The Processor reads ram memory in Slot 1 first.

[Slot 1 is closest to the Processor.
It may have DIMM 1 printed on the motherboard, next to Slot 1 ]

Jun 21, 2010 | Acer Aspire T135 PC Desktop

2 Answers

I want to upgrade my memory on my Pavilion 513n,


FixYa is a product support website, and as such we do not delve into manufacturing. No we cannot supply ram memory.

I can supply you with the solution to your questions, however.

This is HP Support, and the main page for the Pavilion 513n Desktop PC,

http://h10025.www1.hp.com/ewfrf/wc/product?product=90384&lc=en&cc=us&dlc=en&submit.y=5&submit.x=6&lang=en&cc=us

If you click on > Product information > Product specifications > HP Pavilion 513n Desktop PC Product Specifications,
you can view,

A) What type of ram memory the computer uses,
B) How much is the Maximum Total Amount for the computer,
C) How much is the Maximum Amount for EACH ram slot,
D) How many ram slots

Look under the Memory heading.
A) What type of ram memory
Type - DDR
It's DDR Sdram

Speed - PC1600/PC2100
Tells you either PC1600 can be used, or PC2100.

PC1600 is DDR Sdram that operates at 200MHz.
PC2100 is DDR Sdram that operates at 266MHz.

{To expound:
Ram memory operates at a Frequency Rate. Slang for frequency rate is 'Speed'.
Mega = approximately 1 Million
Hertz stands for Cycles per Second
Example: PC2100 is DDR Sdram that operates at 266 Million Cycles per Second }

B) What is the Maximum Total Amount for the computer. (Motherboard)
According to HP it is 1GB.

{Maximum - 1GB (2 X 512) HP recommended maximum}

I believe this to be wrong. The Total Maximum Amount is 2GB.
1GB per ram slot.

I base this upon using the memory configurator's of several websites, that sell ram memory for the Pavilion 513n desktop computer, and looking at what the motherboard chipset for the Pavilion 513n will support.

The motherboard chipset is the Intel 845GL.
This chart found on Wikipedia, states what the Intel 845GL chipset will support,

http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Pentium_4_Chipsets

As you can see reading across from the 845GL subheading, and looking under > Max.memory, 2GB is listed.

Sources for online memory configurators,
1) Crucial.com
2) Tigerdirect.com
3) Newegg.com
4) Memory4less.net

In this case,
C) Maximum Amount for EACH ram slot is 1GB.

D) There are Two ram slots. {Proper speak for ram Slot is ram Bank}

Kingston is a good brand for economical ram memory.
So is Ultra.

An easy way to find out what type of ram memory you need, and how much is the Maximum Total Amount, as well as the Maximum Amount for Each ram slot, is to use an automatic scanner from a website that sells ram memory.

The above four websites listed, are but a small handful of the total websites online that offer an automatic scan.
Let's use Crucial.com for an example.

On the main page,

http://www.crucial.com/

,you will see - Scan My System, in blue.
Simply click on it to run an automatic scan of your computers hardware.
Doesn't look at your personal effects, just the hardware of your computer.

After the scan is done, you will be presented with the ram memory info you need.
Several options of ram memory are presented for you to choose from.


Apr 26, 2010 | HP Pavilion 513n (P9850A#ABA) PC Desktop

1 Answer

Have hp dc 5000 microtower, has ddr 166 ram, what's the most i can put in it?


HP DC 5000 series of business desktop computers;
(All models),

Uses DDR Sdram that operates at a frequency rate of 333MegaHertz. (333MHz)

Also stated as PC2700.

Total Maximum Amount of Ram Memory is 4GB.

EACH ram memory slot's Maximum Amount is 1GB.

There are Four ram memory slots.

(DDR is double pumped ram memory. Has a basic clock rate of 166Mhz, which is double pumped to show up as 332. This is rounded off to 333.

http://www.crucial.com/store/listparts.aspx?model=dc5000%20Series%20All%20Form%20Factors

Mar 02, 2010 | HP Compaq dc5000 PC Desktop

1 Answer

Adding memory, new total not recognized: IBM Thinkpad R51e-1844


Ram should always be paired. Same type, speed and size in each slot. You may have 1 SIMM/DIMM/DDR that has 2 sides of chips and the other with 1 which will do exactly what you state. RAM reads across the chips simultaneously. So if you have a different one in each slot it can go bonkers and do goofy stuff on you.

Jun 14, 2009 | IBM ThinkPad R51 Notebook

2 Answers

CPU speed dropped after installing RAM


Ok. Fear not. You CPU is running at its native speed, it is the fault of Windows reporting the actual CPU speed. If you stop in the BIOS, the real speed will be reported there, the same if you run Linux.

Apr 18, 2009 | Computers & Internet

2 Answers

How do I tell me emachine T5212 to recognize newly installed ram?


The Ram specifications for your model are:
1024MB DDR2 (2 × 512MB), 533MHz (PC4200)
Expandable to 2GB

If you are using Microsoft Windows, the operating system will recognize the memory by itself, there is nothing you have to do. Go to your start menu, right-click on "My Computer" and choose "Properties". In the lower right corner of the "General" tab, you can read the amount of memory available to you.

If you want to know how to put RAM into your computer, have a look at this web page - it's a good video instruction. Make sure not to touch any of the electronic parts on the stick itself - try to hold it on the side.

If your computer does not recognize the newly installed RAM it can have different reasons:
  1. The RAM is bad. Nothing you can do but send it back and get it replaced.
  2. You got the wrong RAM. Look at Crucial's webpage (link) and compare the specs with what you've got. They are very reliable and the memory I bought from them always worked.
  3. It is possible that you have to install the RAM in pairs. (eMachine's web page (link) has no download for a manual and does not cover this topic.) It means, that either both memory slots have to be populated or even populated with the same kind of sticks (2 x 512MB, 2 x 1GB).
Solution: try to replace one of your old sticks with the new 1GB stick and see if that increases your memory. If that doesn't work, take both of the old sticks out and put the new 1GB stick in the slot closest to the CPU (look at the video: it's that unit with the fan on top). If that doesn't work either, try the other slot.
Last resort would be to contact eMachine. You can either use LiveChat or call them. The contact info is on their web page.

If all fails, come back here and leave a comment including what you did. I will check back and then we go from there.

Good luck!

Mar 30, 2009 | eMachines T5212 PC Desktop

3 Answers

Install memory not showing total only half


Hey,

it should show in the bios as 2048.

looking at the details of the motherboard
Memory Type dtrquestion.gif DDR SDRAM Number of Memory Slots 2 x DIMMs Supported RAM speeds 400 MHz

Got the right speed ram etc?



Thanks,
Ekse

Feb 20, 2009 | Computers & Internet

2 Answers

Not recognizing new memory


Take them back out and re-seat them and try again. THe "Retailer" can very well be wrong. You may also need to tell the bios you upgraded, however that is highly unlikely. THe computer may not be able to handle 1gb of ram also, but thats unlikely also. I say it may all lead down to a bad stick of memory you bought from your "retailer"

Nov 04, 2008 | Sony VAIO PCG-K25 Notebook

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