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Bus speed/Frequency of RAM question

By runeknight ยท 8 replies
Mar 2, 2007
  1. I just recently downloaded a program from http://www.cpuid.com/cpuz.php to check if my ram was running at dual channel after i installed a new chip, it is. But then i saw somethng about the frequency running at 266 MHz. My first question is, is frequency and bus speed the same? And if so why is it only running at 266 MHz when the ram says on the box 667/533/400, does the speed depend on something else, say my motherboard? I currently have two PNY 1 GB PC-5300 DDR2 and two PC-4300 DDR2 512MB pieces that came with the computer.
  2. F1N3ST

    F1N3ST TS Rookie Posts: 596

    the faster ram slows down to the lower speeds.
  3. runeknight

    runeknight TS Rookie Topic Starter

    So the one that came with my computer is probably junk? thus the PNY has to go at the same speed as it?, thank you so much
  4. F1N3ST

    F1N3ST TS Rookie Posts: 596

    Yup, and np.
  5. gauss

    gauss TS Rookie

    Actually 266 MHz is the actual frequency,
    DDR ram actually works at a half of the rated frequency,
  6. F1N3ST

    F1N3ST TS Rookie Posts: 596

    No its not for the new memory, the old memory is DDR2-533, 266x2 is 533.
    His new memory is DDR2-667 333x2
  7. Tedster

    Tedster Techspot old timer..... Posts: 6,000   +15

    1. mixing ram will always run the system at the lowest rated speed.
    2. DDR memory runs at twice the speed. for example DDR400 is 200mhz x 2
    3. read the installing ram guide in the guides forum.
  8. jobeard

    jobeard TS Ambassador Posts: 10,432   +801


    CPUs are >> faster than any memory or bus. To compensate, there's a cache
    system and at worst case, a cpu idle-wait state (ie waiting on data).

    The BUS is used to move data between components, eg USB device and memory, PCI devices and memory, CPU to device.

    Best choices are Fastest CPU, largest cache, and hightest BUS speed you can afford.
  9. gauss

    gauss TS Rookie

    two mem_controllers intergrated in CPU or North Bridge,each mem_controller controls one channel
    If two types of mem installed at one channel,the spped must be the lower frequency,266MHz
    So,U should re-installed Ur mem,speed will boost
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