TechSpot

RAM operating frequency problem

By Zeratul
Aug 4, 2006
  1. Hello there,

    I'm having a problem with my PC.

    I have two RAM slots and only one bank in my motherboard

    I have to set my PC's RAM frequency to 266 MHz. If i make it 333MHz, the pc becomes completely unstable and at an unpredicted instant, it produces the cute BSOD.

    Currenlty, there's no problem. But i want to buy another RAM stick.
    If i install this new one, will my pc be stable or not?????
    Also, i want to know why my pc is unstable at ram freq.=333mhz?

    Also, when i went to purchase a new ram stick and get an overview of the prices, they asked me whether i want DDR1 or DDR2 ? >>What are these? what is pc2700 or pc2100????


    Please help me.

    After using CPU-Z, here are my PC's data::

    Name Intel Pentium 4
    Code:
    Code Name Northwood 
    Specification Intel(R) Pentium(R) 4 CPU 2.40GHz 
    Family / Model / Stepping F 2 7 
    Extended Family / Model F 2 
    Brand ID 9 
    Package mPGA-478 
    Core Stepping C1 
    Technology 0.13 um 
    Supported Instructions Sets MMX, SSE, SSE2 
    CPU Clock Speed 2422.6 MHz 
    Clock multiplier x 18.0 
    Front Side Bus Frequency 134.6 MHz 
    Bus Speed 538.4 MHz 
    L1 Data Cache 8 KBytes, 4-way set associative, 64 Bytes line size 
    L1 Trace Cache 12 Kuops, 8-way set associative 
    L2 Cache 512 KBytes, 8-way set associative, 64 Bytes line size 
    L2 Speed 2422.6 MHz (Full) 
    L2 Location On Chip 
    L2 Data Prefetch Logic yes 
    L2 Bus Width 256 bits 
    
    Mainboard and chipset

    Code:
      
    Motherboard manufacturer MICRO-STAR INC. 
    Motherboard model MS-6788, 20A 
    BIOS vendor American Megatrends Inc. 
    BIOS revision V5.4 on 07.00T 
    BIOS release date 07/02/04 
    Chipset Intel i865P/PE/G/i848P rev. A2 
    Southbridge Intel 82801EB (ICH5) rev. 02 
    Sensor chip Winbond W83627THF 
    FSB Select 533 MHz 
    Performance Mode enabled 
    
    Memory

    Code:
    DRAM Type DDR-SDRAM 
    DRAM Size 256 MBytes 
    DRAM Frequency 134.6 MHz 
    FSB:DRAM 1:1 
    CAS# Latency 2.5 clocks 
    RAS# to CAS# 4 clocks 
    RAS# Precharge 4 clocks 
    Cycle Time (TRAS) 8 clocks 
    # of memory modules 1 
    Module 0 DDR PC2700 - 256 MBytes 
    
     
  2. howard_hopkinso

    howard_hopkinso TS Rookie Posts: 24,177   +19

    Hello and welcome to Techspot.

    DDR ram is double data rate, which means the ram frequencies are as follows.

    DDR 400(pc3200)=400mhz and runs on an fsb(front side bus) speed of 200mhz.

    DDR 333(pc2700)=333mhz and runs on an fsb(front side bus) speed of 166mhz.

    DDR 266(pc2100)=266mhz and runs on an fsb(front side bus) speed of 133mhz.

    In other words your DDR333(pc2700) ram(if that`s what it is), should be set to an fsb(front side bus) speed of 166mhz. Any higher than that and you`re overclocking the ram. This is very likely to cause stability issues.

    Regards Howard :wave: :wave:
     
  3. Zeratul

    Zeratul TS Rookie Topic Starter Posts: 70

    Thank you X 2

    thanks howard for the welcome and thanks for the info.

    but i still have a question.

    after some googling, i found this:
    http://www.overclockercafe.com/Articles/DDR_vs_DDR2/index.htm

    in it, i found a comparison between ddr1 and ddr2.

    Please correct me if i'm wrong: i think it would be better for me if i want good performance and stability if i buy ddr2 + good speed IF I LATER UPGRADE MY CPU, isn't it?

    i feel that i'm wrong :) because i have some confusion (after looking at that comparison table) because they've written BUS FREQUENCY and DRAM FREQ.

    it is to be noted that the DRAM FREQ. is the one i set in the bios for my current RAM stick.

    so, which one should i buy? :confused: :suspiciou
    also, the operating voltages, ddr1=2.5 while ddr2=1.8 , can this work on my MB?

    why is ddr2 more expensive than ddr1 although their specs are interchangably good?
     
  4. howard_hopkinso

    howard_hopkinso TS Rookie Posts: 24,177   +19

    The first thing to check, is whether your mobo supports ddr2 ram.

    I suspect DDR2 is more expensive due to it being fairly new technology and the fact it gives better performance, but don`t quote me on that lol.

    Regards Howard :)
     
  5. Zeratul

    Zeratul TS Rookie Topic Starter Posts: 70

  6. howard_hopkinso

    howard_hopkinso TS Rookie Posts: 24,177   +19

    I don`t think your mobo supports DDR2. It certainly doesn`t say it does, so assume it doesn`t. Your mobo supports upto DDR400(pc3200) ram. See your mobo specs HERE.

    Regards Howard :)
     
Topic Status:
Not open for further replies.

Similar Topics

Add New Comment

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...