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Thread: Help me tweak my ram timings?




  1. #1
    Join Date
    Dec 2008
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    Default Help me tweak my ram timings?

    Here is my ram. G.Skill 1066 (F2-8500CL5-4GBPK)

    I finally got my OC stable and now I'm moving on to tweaking my ram.

    Right now I have these current settings.

    MCH Frequency Latch - 400mhz
    System Memory Multiplier 2.00D

    CAS Latency Time [5]
    tRCD [5]
    tRP [5]
    TRAS [15]

    DRAM Voltage - 2.000v

    tRRD - 4
    tWTR - 4
    tWR - 8
    tRFC - 68
    tRTP - 4

    Driving Strength - 800
    Static tRead Value - 9


    I have never messed with these advanced timings before so I'm not exactly sure how low (tight) I can go?
    Q9550 @ 3.825ghz (450x8.5)
    Gigabyte GA-EP45-DS3L

    G.Skill DDR2 1066
    4gb
    Visiontek HD 4870x2

    x2 WD6400AAKS

    Silverstone DA800 800w

    Cooler Master Hyper 212

    Vista Ultimate SP1 64-bit

  2. #2
    owcraftsman is offline Junior Member
    Join Date
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    Location
    Cape Coral, FL
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    Default Re: Help me tweak my ram timings?

    First you need some tools
    Download is available at Memtest86+ - Advanced Memory Diagnostic Tool

    Official Forum : http://forum.memtest.org
    You need to make small changes in bios and test the changes. Keep a log.
    All systems even with exact same hardware are different so there is no magic fix here.
    Trial and error is you best bet. Read some guides too, look for your processor and mobo reviews and read them. Google is my best friend! Yours too!

    Here is a general guide to get you going.

    Remember this... lower values leads to higher voltages

    tCL Sometimes you can set this to tCL -1 you have 1066 memory running at 800 no?
    tRCD, set this to the same value as tCL or use tCL -1.
    try different values and go with the lowest number you can get away with without the need for excessive memory voltage.
    tRP set this to the same value as tCL or use tCL -1.
    tRAS never set lower than tRCD + tCL + 2.
    tRAS set lower than tRCD + tCL + 2.
    Command Rate 1t/2t see mfg doc very litte gain one way or the other
    tRC one of the most important timings set it no lower than tCL + tRAS + 2.
    Even small reductions in this timing can bring about large decreases in memory access latencies
    tWR Tighten this to 10 if you can. Some memory will go as low as 8 if you feed it enough voltage
    tWTR leave auto
    tFAW Try setting this to whatever you use for tRC.
    tRD some real gains can be had here for the experienced tweaker use auto otherwise but with the intel chipset I heard stories of using memset to lower this timing in windows to get significent gains.search google and read up
    tRPT auto
    tRFC of at least 72 Go too far though and you will be greeted with a BSOD during OS load.
    tREFauto

    Good Luck!
    Last edited by owcraftsman; 01-09-2009 at 01:39 PM. Reason: my typing sucks

  3. #3
    owcraftsman is offline Junior Member
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  4. #4
    Join Date
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    Default Re: Help me tweak my ram timings?

    Sorry for the late response a few things came up at work and this little project was set to the side. I'll give it a go this weekend [time permitting] Yes I'm running 1066 memory at 800. So I presume I'm safe to tighten these timings up a bit. tCL and tRCD should be safe at -1? I'll google around a bit and post back with anymore questions should I have any. Thanks for the help.
    Q9550 @ 3.825ghz (450x8.5)
    Gigabyte GA-EP45-DS3L

    G.Skill DDR2 1066
    4gb
    Visiontek HD 4870x2

    x2 WD6400AAKS

    Silverstone DA800 800w

    Cooler Master Hyper 212

    Vista Ultimate SP1 64-bit

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