Memory upgraded laptop recognizes only 1 chip

Posted on 2007-09-29
Last Modified: 2013-12-01
I recently purchased RAM chips for my daughter's Sony VAIO PCG-K13.  The laptop came with (2) 256 chips and I needed to upgrade to 1 gig in order to install Adobe's new Creative Suite.  I purchased (2) 512 chips that are supposed to be compatible.  The laptop will only recognize 1 chip at a time, so I still only have 512 RAM and am unable to install the new software.

I've checked both chips in both slots.  The chips seem to be working.  The slots seem to be working.  After about 4 hours with tech support from Sony, the chip maker, and the vendor where I got my chips, I'm still no where. I updated the BIOS this morning, but it still only recognizes 512 RAM.  Have any suggestions?
Question by:laurieapplegate
    LVL 26

    Expert Comment

    What is the make and model of the memory you purchased, assuming that the vendor is not the same as the manufacturer? Does the RAM have Gold edge connectors? Are they PC2100 (CL2) DDR SO-DIMMS? You can download System Information for Windows from, run it, and then in the Hardware section, under Memory, check the right-hand screen for Manufacturer, Part Number, Capacity, Memory Type, and Speed. List those here so we can take a look.

    Author Comment

    I ran the file you suggested.  It is showing the information for the old chips (256 each, PC2100S-2033-0-A1, Infineon). The new chips are Corsair 512MB PC2700 SODIMM 333MHz.  TigerDirect item number C13-2912. Yes, they have gold edge connectors.
    LVL 26

    Accepted Solution

    The original chips are PC2100 (CL2) DDR SO-DIMMS.

    The Corsair chips are PC2700 (CL2.5) DDR SO-DIMMS.

    CL is the Column Access Strobe (CAS) Latency, or CL value. This is the number of memory cycles that elapse between the time a column is requested from an active page and the time that the data is ready to begin bursting across the bus. This is the most common occurrence, and so, CAS Latency generally has the largest impact on overall memory performance for applications that depend on memory latency.

    The PC2700 runs at 333Mhz and is backwards compatible with the PC2100 which runs at 266Mhz.

    I'm surprised TigerDirect wasn't able to take care of this. The RAM should run, but it doesn't. It may be that one or both chips are problematic. Did either they or Sony recommend that you run any diagnostics on the memory?

    If not, download and run Memtest. You'll want the Pre-Compiled Memtest86 v3.3 installable from Windows and DOS. It can be found here:

    Then, cut out the middle-man, and go directly to Corsair, the RAM manufacturer, to see if they are willing to help. Their contact information can be found here:

    If no joy, contact a different vendor for the RAM:

    A quick search turned up this one. I'm sure there are others

    LVL 91

    Assisted Solution

    i would suggest using the same model chips :
    The original chips are PC2100 (CL2) DDR SO-DIMMS

    Author Comment

    Thank you for your help.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    IT, Stop Being Called Into Every Meeting

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Suggested Solutions

    Title # Comments Views Activity
    Video card for a Dell Optiplex 990 4 38
    Can't access APC web portal 6 56
    Driver Problem 12 50
    Intel 2.53Ghz processor vs. ? 7 8
    I. Introduction There's an interesting discussion going on now in an Experts Exchange Group — Attachments with no extension ( This reminded me of questions tha…
    I use more than 1 computer in my office for various reasons. Multiple keyboards and mice take up more than just extra space, they make working a little more complicated. Using one mouse and keyboard for all of my computers makes life easier. This co…
    This video discusses moving either the default database or any database to a new volume.
    In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor ( If you're interested in additional methods for monitoring bandwidt…

    737 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    23 Experts available now in Live!

    Get 1:1 Help Now