memory performance boost

Discussion in 'Windows Desktop Systems' started by valicu2000, Aug 25, 2003.

  1. valicu2000

    valicu2000 Guest

    Hi there!
    If you have a lately PC3200 DDR SDRAM memory module and a smart mainboard, I recommend you to slow down the memory form the BIOS from 400 MHz to 266MHz, and also to decrease the CAS from 2.5 to 2 or even 1.5. A good tweak form BIOS is setting the COMMAND RATE from 2 to 1 (if the memory supports it).

    Good luck to you!
  2. silky62678

    silky62678 Guest

    How can u tell if u have a smart mobo ? I guess a better question is, what do u mean by "smart" mobo ?
  3. Taurus

    Taurus hardware monkey

    Sacramento, CA
    umm, the best speed to have your memory running at depends on the chipset and the frontside bus. valicu's advice isn't thought out very well.
  4. Daviepants

    Daviepants Guest

    It's too vague.

    What should my settings be if I have an NForce2 Chipset?
  5. Taurus

    Taurus hardware monkey

    Sacramento, CA
    if you're utilizing dual-ddr (two sticks), then it's probably best to set the memory frequency to the same speed as your cpu's bus speed. then after that, finding your best timings is a matter of trial and error.
  6. valicu2000

    valicu2000 Guest

    First of all be sure that in the BIOS you can lower the CAS latency to 1.5 and set the command rate to T1. You see a higher frequency RAM gives a higher bandwidth...BUT the 2.1 GB/s bandwidth (which corresponds to 266 MHz, or 133 FSB) is more than enough. The problem remains the speed. The RAM is not working in the same time with the cpu, there is a delay between read/write which time the CPU must wait. So lowering this time gives a better performance at the sacrifice of bandwidth.
    I have made a test: I have this 512MB DDR SAMSUNG PC 400@CL 2.5...I set it to work at PC 266 and CL 1.5. I was astonished. There was a great increase in performance...even a 500 MHz faster CPU wouldn't do that.
    There are some memory tweaks I saw on the net...and all comes from the mobo's BIOS:
    1> BANK INTERLEAVING should be set to 4
    2> BURST LENGTH sould be set to 8
    3>also the RAS, CAS must be set to lower values

    All this depend on what kind of BIOS your mobo has.
    As far as I know nFORCE2 based mobos are using dual channel DDR which is almost as a RAID for HDD. The ting is that you must use 2 identical memory modules, and both set to work at the same parameters.
    There is another option - ONLY FOR OVERCLOCKERS - you can raise the RAM's voltage and set a higher FSB. THIS IS ONLY IF YOU KNOW WHAT YOU ARE DOING. YOU CAN DAMAGE YOUR RAM OR MOBO.
  7. valicu2000

    valicu2000 Guest

    I have a SOLTEK SL-75 FRV mobo(KT 400). I say that it is smart because it:
    1> has FIRESTORM OVERCLOCKING - it raises the cpu' FSB by 1 Mhz and tests the stability, until it reaches the limit

    2> can change the multiplier rate (I overclocked my 2200+ to 2400+, raising the voltage to 1.675, and setting the multiplier from 13.5 to was impossible to raise the FSB higher than 143 MHz)

    3> can set RAM' s CAS to 1.5
  8. RagnaroK

    RagnaroK Must be dreaming...

    That's true though! My epox nforce2 board ran at 166MHz while my dual ddr-333 RAM sticks ran at 133MHz. I decided to change it to 166MHz (sync with bus speed) and I got a half-a-gig increase in memory bandwidth. :D :D