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Memory

By xXxZxXx
Aug 21, 2008
  1. I'm trying to figure out why my computer memory is running at 400 MHz and it says the same thing on my friends computer. We have the identical motherboards with different memory. His is Crucial Ballisticz 4GB and mine is Corsair Twinx 2 GB. I'm running windows vista and he is running windows xp. We noticed it on everest. Any reason to this or is it normal.

    This is what PC Wizard says on my memory:

    eneral Information :
    DIMM_A1 (RAS 0) : 1024 (Single Bank)
    DIMM_B1 (RAS 2) : 1024 (Single Bank)
    DIMM_A2 : Empty
    DIMM_B2 : Empty

    Information SPD EEPROM (DIMM_A1) :
    Manufacturer : Corsair
    Part Number : CM2X1024-6400C4
    Serial Number : Unspecified
    Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-800]
    Format : Regular UDIMM (133.35 x 3)
    Size : 1024 MB (1 ranks, 8 banks)
    Module Buffered : No
    Module Registered : No
    Module SLi Ready (EPP) : Yes
    Width : 64-bit
    Error Correction Capability : No
    Max. Burst Length : 8
    Refresh : Reduced (.5x)7.8 µs, Self Refresh
    Voltage : SSTL 1.8v
    Prefetch Buffer : 4-bit
    Manufacture : 2000
    Supported Frequencies : 270 MHz, 400 MHz
    CAS Latency (tCL) : 4 clocks @270 MHz, 5 clocks @400 MHz
    RAS to CAS (tRCD) : 4 clocks @270 MHz, 5 clocks @400 MHz
    RAS Precharge (tRP) : 4 clocks @270 MHz, 5 clocks @400 MHz
    Cycle Time (tRAS) : 13 clocks @270 MHz, 18 clocks @400 MHz
    Min TRC : 15 clocks @270 MHz, 22 clocks @400 MHz

    EPP Profile #1 : Full Performance
    Voltage Level : 2.1V
    Address Command Rate : 2T
    Cycle Time : 2.5ns @400 MHz
    CAS Latency (tCL) : 4 clocks
    RAS to CAS (tRCD) : 4 clocks
    RAS Precharge (tRP) : 4 clocks
    Cycle Time (tRAS) : 12 clocks
    tRC : 102 clocks
    tWR : 26 clocks

    Information SPD EEPROM (DIMM_B1) :
    Manufacturer : Corsair
    Part Number : CM2X1024-6400C4
    Serial Number : Unspecified
    Type : DDR2-SDRAM PC2-6400 (399 MHz) - [DDR2-800]
    Format : Regular UDIMM (133.35 x 3)
    Size : 1024 MB (1 ranks, 8 banks)
    Module Buffered : No
    Module Registered : No
    Module SLi Ready (EPP) : Yes
    Width : 64-bit
    Error Correction Capability : No
    Max. Burst Length : 8
    Refresh : Reduced (.5x)7.8 µs, Self Refresh
    Voltage : SSTL 1.8v
    Prefetch Buffer : 4-bit
    Manufacture : 2000
    Supported Frequencies : 270 MHz, 400 MHz
    CAS Latency (tCL) : 4 clocks @270 MHz, 5 clocks @400 MHz
    RAS to CAS (tRCD) : 4 clocks @270 MHz, 5 clocks @400 MHz
    RAS Precharge (tRP) : 4 clocks @270 MHz, 5 clocks @400 MHz
    Cycle Time (tRAS) : 13 clocks @270 MHz, 18 clocks @400 MHz
    Min TRC : 15 clocks @270 MHz, 22 clocks @400 MHz

    EPP Profile #1 : Full Performance
    Voltage Level : 2.1V
    Address Command Rate : 2T
    Cycle Time : 2.5ns @400 MHz
    CAS Latency (tCL) : 4 clocks
    RAS to CAS (tRCD) : 4 clocks
    RAS Precharge (tRP) : 4 clocks
    Cycle Time (tRAS) : 12 clocks
    tRC : 102 clocks
    tWR : 26 clocks

    Memory Controller Information :
    Memory Controller : Standard, SDRAM
    Number of connectors : 4
    Max. Module Size : 1024 MB
    Max. Memory Size : 4096 MB
    Supported Speed : 70ns, 60ns, 50ns
    Supported Voltages : 2.9v
    Error Detection Method : 64-bit ECC
    Error Correction Capability : None
    Current/Supported Interleave : 1-way/1-way
     
  2. woody1191

    woody1191 TS Rookie Posts: 572

    Ok please take note of this above since it is DDR2 Memory you have a Double Frequency, DDR stands for Double Data Rate.

    So for example DDR 400mhz RAM would be just 400mhz Bus Frequency while if it was DDR2 it would be 800mhz (Multiplied By 2) and if DDR3 it would be 1200mhz (Multiplied By 3).

    Do you see what happens there?

    Hopefully that answers your Question.
     
  3. xXxZxXx

    xXxZxXx TS Rookie Topic Starter Posts: 77

    Oh ok, so being that it says that, my memory is actually running at 800 MHz?
     
  4. woody1191

    woody1191 TS Rookie Posts: 572

    Yes your Memory is running at 800Mhz based on the Information above.
     
  5. xXxZxXx

    xXxZxXx TS Rookie Topic Starter Posts: 77

    Alrighty, thanks.
     
  6. Tedster

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

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