Question about Toshiba Satellite L25-S121 Notebook

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I've installed 2 gigs of ram and it won't recognize the second stick.

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The L25 series laptops can take a maximum of 2GB of memory, 1GB per slot. It should be DD2 PC-5300 spec RAM. Below is some specifications the memory should meet alongst with a compatible part number.
Part #: CT540972 • DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 1.8V • 128Meg x 64

Cheers, Ravi Shanghavi

Posted on Aug 19, 2010

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I installed two new 1 gigabyte memory sticks into a Dell Inspiron 6000, which previously only had 2 256 megabyte memory sticks installed. When I first installed the 2 gigs of new memory, the laptop turned...


Once you installed the memory, did you enter into the System BIOS Setup screen? Do this and verify that the system recognizes the newly installed 2GB RAM. This should let the system access the new memory once you boot.

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Running a 1 gig stick and a 512mb stick, system only shows 896mb, apparently not recognizing all of the ram installed?


I assume that you've booted the computer with _ONLY_ the 512MB stick installed, and that the computer recognized it (reporting either 512MB or 384MB), i.e., the 512MB RAM is not "defective".

Hmm. 1024 minus 896 is 128.
So, the "integrated-into-the-motherboard" video-card is "stealing" 128MB of your RAM, to be used strictly for "video" purposes, leaving 896MB for Windows to use.

Now, about the "missing" 512MB of RAM.

1. If you have four slots for RAM, and they are physically arranged into two pairs of two slots, rather than four equally-spaced slots, your motherboard is capable of "dual-channel" mode. But, since your two sticks of RAM are not "matched" (size, speed), you _MUST_ insert both sticks into _ADJACENT_ slots (not slots 1/3, nor slots 2/4), in order to run your RAM in "single-channel" mode.

2. If you have two slots for RAM, interchange the two sticks, to see if that makes a difference.

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I have an Acer Aspire 7540-1284 laptop that came with 3GB memory. The specs say expandable to 4GB but the manual says expandable to 8GB using soDimm modules. I can't find info anywhere to support...


it prolly has 2 ram slots, capable of holding a 4gig ram stick apiece- for a total of 8 gigs.

however, the largest ram stick they currently make is 2 gigs. your board can support 2x4gigs of ram (8 altogether), buit the most ram you can currently purchase is 2x2gigs (for 4 gigs altogether).

additionally, you have to have a 64 buit version of windows to regognize all 8 gigs if you had them.
a 32 bit version of windows will recognize no more than 4 gigs of ram.

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I upgrade the memory of a Dell Dimension Desktop 9150 from 512 MB to 2 GB,The machine accept up to 4 GB..In the BIOS appear the 2 GB but on system in Control Panel only shows 512 MB..Can anybody give me a...


No you don't have to install a 64 bit OS. Only if you install over 3 gigs you MUST install a 64 bit operating system. 800MHZ is fine it will just back down to 667MHZ. your 32bit windows OS will see up to 3 gigs (minus graphics card memory). SO 2 gigs will work fine. Install one stick at a time and check in the OS and bios to make sure each stick works. I would say you possibly have a dead ram stick.

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1 Answer

Memory not recognized. 4 gig installed only 2 gig recognized by bios and windows. Vista home premium 32 bit.


2GB is quite low but you will never see the full amount of ram.
Your video card will use some and then Windows reserves some for itself.
You dont say if its 2x2gb sticks or just one, if two does bios see the full 4gb. Check the memory is properly seated. Try swapping the sticks round.

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2 Answers

DDR2's only showing half installed RAM


IF THE SYSTEM SAYS YOU HAVE 1GB RAM THAN YOU HAVE 1 GIG OF RAM, EVEN THOU SOMEONE TOLD YOU YOU HAD 2-512MG=1GB.

HERE IS HOW I SEE WHAT YOU ARE SAYING YOU HAVE 2-DDR-2 1 GIG STICKS THAT MEAN IF 1 IS INSTALLED THAN YOU HAVE 1 GB AND IF YOU COULD GET 2 STICKS WORKING TOGETHER THAN YOU WOULD HAVE 2GB RAM.
1 CHIP SET = 1GB RAM
2 CHIP SET = 2GB RAM

YOU MOTHERBOARD MAY NOT ALLOW THAT MUCH RAM, OR WHAT I MEAN THE BIOS MAKE UP THE AMOUNT OF RAM.

TO RULE OUT ANY BAD CHIP SETS OR GOOD RAM OR BAD RAM.

TAKE THE PEACE OF RAM THAT IS WORKING OUT AND REPLACE IT WITH THE OTHER PEACE AND SEE IF IT WILL RUN.
IF IT WORKS THAN LEAVE THAT ONE IN PLACE AND INSTALL THE SECOND PEACE IN THE SECOND SLOT.
IF BOTH CHIP SET ARE GOOD THAN BOTH SHOULD WORK OKAY TOGETHER.
IF THERE IS A PROBLEM, IT MAYBE SOME DUST IN THE MEMORY LOTS
OR THE SLOT MAYBE DAMAGED.
OR
THE CHIP DESIGN LAYOUT MAYBE THE OPPOSITE SIDE, THIS MAY MEANS THE CHIPS MAY FACE EACH OTHER, OR FACE OUTWARD FROM EACH OTHER.

ROD

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1 Answer

One of the ram isnt recognised???


This is likely a memory timing incompatibility. You can go into the BIOS settings of many motherboards and set the timing specifically for each RAM slot, but without knowing exactly which piece of RAM you have I can't tell you what to set it at. You could use the utility CPU Z, install one stick, run the utility and write down all the memory information, then install the other stick and write it down too. Then go into your BIOS and see if you can set all of your specifications to match the memory.

Of course if you could find someone to swap sticks with that would be easier. Some motherboards are more picky than others about which sticks they work well with, name brand manufacturers are more picky than aftermarket in general.

Dec 30, 2008 | Computers & Internet

5 Answers

4gigs ram


Switch sticks around in various combinations (2 gig in slot one, 1 gig in slot two, switch, try other stick, etc) and see if it is the memory or the motherboard.

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