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Image for Crucial 1GB DDR2-800 UDIMM from Crucial USA

Crucial 1GB DDR2-800 UDIMM


  • Brand: Crucial
  • Form Factor: UDIMM
  • Total Capacity: 1GB
  • Warranty: Limited Lifetime
  • Specs: DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 128Meg x 64 •
  • Series: Crucial
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    5 stars 413 reviews
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    • $15.99
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    Crucial 1GB DDR2-800 UDIMM

    product information

    Error Correcting Code is a logic used on some DRAM chips to catch and correct memory errors. It is most common on memory for servers and workstations.
    Number of modules. Memory can be installed as single modules or in kits comprised of 2 or more identical modules. Each module requires its own slot for installation.
    Product Specifications
    Brand Crucial
    Form Factor UDIMM
    Total Capacity 1GB
    Warranty Limited Lifetime
    Specs DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 1.8V • 128Meg x 64 •
    Series Crucial
    Kit Qty 1
    Speed 1066 MT/S
    Tracer False
    Voltage 1.8V
    Bullet Features Increases system performance
    DIMM Type Unbuffered
    More information

    240-pin DIMM

    A dual inline memory module (DIMM) consists of a number of memory components (usually black) that are attached to a printed circuit board (usually green). The gold pins on the bottom of the DIMM provide a connection between the module and a socket on a larger printed circuit board. The pins on the front and back of a DIMM are not connected to each other.

    240-pin DIMMs are used to provide DDR2 SDRAM memory for desktop computers. DDR2 is a leading-edge generation of memory with an improved architecture that allows it to transmit data very fast.

    Each 240-pin DIMM provides a 64-bit data path (72-bit for ECC or registered or Fully Buffered modules). (The Ballistix™ and Ballistix Tracer™ high-performance memory do not come in 72-bit or registered modules.)

    To use DDR2 memory, your system motherboard must have 240-pin DIMM slots and a DDR2-enabled chipset. A DDR2 SDRAM DIMM will not fit into a standard SDRAM DIMM socket or a DDR DIMM socket.

    The number of black components on a 240-pin DIMM can vary, but it always has 120 pins on the front and 120 pins on the back, for a total of 240. 240-pin DIMMs are approximately 5.25 inches long and 1.18 inches high, though the heights can vary. While 240-pin DDR2 DIMMs, 184-pin DDR DIMMs, and 168-pin DIMMs are approximately the same size, 240-pin DIMMs and 184-pin DIMMs have only one notch within the row of pins. The notch in a 240-pin DDR2 DIMM is closer toward the center of the module.

    product reviews

    OID: 0C71C017A5CA7304
    PR file path: /pwr/96v439cu/inline/01/71/0C71C017A5CA7304-en_US-1-questions.html

    Do you have questions about this product?

    Get answers from real customers and in-house experts with AnswerBox.

    2 Questions | 4 Answers
    Displaying questions 1-2
    • Q:

      I have a Dell Dimension 8400. I want to take out the memory and add 3GB of higher speed memory. These Crucial 1GB modules seem to have the same specs as memory which Dell says is compatible with my 8400. Yet Crucial's Memory Advisor says this module is not compatible. Is this correct?
      Asked on 12/20/2011 by Anonymous

      1 answer

    • Q:

      What does the 6400 stand for
      Asked on 4/25/2011 by Anonymous

      3 answers

      • Staff Reviewer


        PC2-4200 (DDR2-533), PC2-5300 (DDR2-667), PC2-6400 (DDR2-800), and PC2-8500 (DDR2-1066) memory are all types of Double Data Rate, second-generation SDRAM, usually referred to as DDR2. The varying numbers refer to the different speeds of memory your computer was designed for. PC2-6400 (DDR2-800), which has a bandwidth of 6.4GB/sec and is designed for use in systems and motherboards that require a 400MHz front-side bus, with an effective front-side bus speed of 800MHz.

        Answered on 5/3/2011 by Crucial Support from Meridian, Idaho
      • A:

        Its referring to the speed of the ram itself in technical terms mostly labeled on the packaging of the item. A dimm module for example a 2gb 800mhz 240 pin PC2-6400 is clocked at 800mhz so the 800mhz is multiplied by 8 bit (smallest digital character) which equals 6400(800x8=6400), same thing goes for a dimm(ram) which is clocked at 667mhz then this would be 667x8=5336 but on the box of the ram you'll see PC2-5300.

        Answered on 10/3/2011 by vaina001 from Jersey City, NJ


        The 6400 is basically the speed that the RAM runs at. Not sure what the speed is measured by (GHz or MB ect) but naturally the higher the better, however, if you are installing more RAM into a computer then the RAM will only go as fast as the slowest RAM already installed.

        Answered on 10/30/2011 by Toad from USA, TN
    Displaying questions 1-2

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