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Thread: need help with FSB:DRAM ratio




  1. #1
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    Default need help with FSB:DRAM ratio

    I just read it on other website that FSB:DRAM ratio should be 1:1 for C2D processors and my current FSB:DRAM ratio is 5:8 and I want to make it 1:1 ratio..
    I have OCZ Platinum 2GB DDR2 1066 RAM.Here's the link of the RAM->Newegg.com - OCZ Platinum 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory - Desktop Memory

    CPU-Z pics
    http://i382.photobucket.com/albums/o.../cpuz/CPUz.jpg
    nd here are the pics of my BIOS settings..
    1) PC Health Status
    http://i382.photobucket.com/albums/o...8/DSC02673.jpg
    2)M.I.T Settings Part 1
    http://i382.photobucket.com/albums/o...8/DSC02674.jpg
    3)M.I.T Settings Part 2
    http://i382.photobucket.com/albums/o...8/DSC02675.jpg
    nd My PC specs:
    GIGABYTE GA P35-DS4(BIOS ver F11)
    Intel C2D E8400 @3.0GHz
    OCZ Platinum 2GB DDR2 1066

    Thank You..


  2. #2
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    Default Re: need help with FSB:DRAM ratio

    Well, assuming ur CPU is at 333mhz FSB, ud need to overclock ur RAM from 1066 to 1333 which is going to b NEAR impossible! unless u hav some sort of super RAM. Remember 1066 modules are just 800 modules which are certified to run at 1066 speeds. so ur effectively overclocking an already overclocked RAM module. It IS perfectly ok to not have a 1:1 FSB:DRAM ratio.
    Asrock P55-Extreme
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  3. #3
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    Default Re: need help with FSB:DRAM ratio


  4. #4
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    Default Re: need help with FSB:DRAM ratio

    I just read it on other website that FSB:DRAM ratio should be 1:1 for C2D processors and my current FSB:DRAM ratio is 5:8 and I want to make it 1:1 ratio..
    The 5:8 ratio is fine for Core 2 Duo Cpu's - the other website is wrong if it says the ratio "should be" 1:1.
    GA-P35C-DS3R Rev2.0 F11 bios, E8200 (@3.0Ghz), OCZ DDR3 PC3-10666 Reaper 4GB (@1200Mhz), Xonar D1, 8800GTS 512, Corsair HX520 (Single 12volt line, Max 40A), WDC 3200aaks/5000aaks in AHCI mode, Vista 64 Premium.

  5. #5
    Lsdmeasap's Avatar
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    Default Re: need help with FSB:DRAM ratio

    I agree, 1:1 is a thing of the past and is no longer the BEST way to run things.

    If you do want to run 1:1 you need to set your Memory Multi to 2.00 and raise your FSB to 533, you would need to of course likely lower your CPU multi and set some voltages as well

  6. #6
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    Default Re: need help with FSB:DRAM ratio

    Thanx for the help..
    I've decided to keep my current ratio..
    but just out of curiosity if i change my FSB speed to 533 and CPU multiplier to 6..what voltage should I set for CPU, FSB Control etc..right now all the settings are set to normal..

    Thank You..
    Last edited by A-5; 11-24-2008 at 10:01 AM. Reason: forgot to add something

  7. #7
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: need help with FSB:DRAM ratio

    All I can say is more... You would have to test until you find what works

    I would guess based on what my E3110 (Same as E8400) uses at 533 FSB, I set 1.34-1.36 Vtt and Vcore to 1.38-1.42 (BIOS setting, actual 1.32-1.36) You may need more or less

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    Default Re: need help with FSB:DRAM ratio

    Quote Originally Posted by Lsdmeasap View Post
    All I can say is more... You would have to test until you find what works

    I would guess based on what my E3110 (Same as E8400) uses at 533 FSB, I set 1.34-1.36 Vtt and Vcore to 1.38-1.42 (BIOS setting, actual 1.32-1.36) You may need more or less
    I actually find my E8200 doesn't like anything above 1.225volts and is quite happy to overclock to 3.2ghz on 1.184volts. Looking around the web, many of the E8xxx chips especially C0 stepping are quite happy on a lowish Vcore, so personally I'd look elsewhere before I started to bump up the voltage, unless i was extreme overclocking.
    GA-P35C-DS3R Rev2.0 F11 bios, E8200 (@3.0Ghz), OCZ DDR3 PC3-10666 Reaper 4GB (@1200Mhz), Xonar D1, 8800GTS 512, Corsair HX520 (Single 12volt line, Max 40A), WDC 3200aaks/5000aaks in AHCI mode, Vista 64 Premium.

  9. #9
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: need help with FSB:DRAM ratio

    Well he was wanting to run 533 FSB and most all would need more then 1.225 for sure to do that. At higher FSB or Freq for sure more voltage then 1.22 is very often needed.


    You are right though at low overclocks far less is needed, at 3.2 I can use 1.15V on my Xeon

  10. #10
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    Default Re: need help with FSB:DRAM ratio

    Quote Originally Posted by Lsdmeasap View Post
    Well he was wanting to run 533 FSB and most all would need more then 1.225 for sure to do that. At higher FSB or Freq for sure more voltage then 1.22 is very often needed.


    You are right though at low overclocks far less is needed, at 3.2 I can use 1.15V on my Xeon
    I see your Xeon has a lower upper limit compared to my E8200. It's just with all the research I've done lately, in the main even at 3.6-4Ghz, people have kept the e8xxx to under 1.25volts and those that had taken the chips beyond their upper voltage level had seen a degradation in the chip itself..

    I did see a guy who had managed 5.1Ghz at 1.784volts - but that's Not recommended for anyone lol.
    GA-P35C-DS3R Rev2.0 F11 bios, E8200 (@3.0Ghz), OCZ DDR3 PC3-10666 Reaper 4GB (@1200Mhz), Xonar D1, 8800GTS 512, Corsair HX520 (Single 12volt line, Max 40A), WDC 3200aaks/5000aaks in AHCI mode, Vista 64 Premium.

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