memory timing

W4R-H1LDW4R-H1LD Chesterfield VA
edited March 2005 in Hardware
What are the best memory timings for samsung ddr3200 ? ive got asus a7n8x barton 2500 currently 11x200 1.6v= xp3200 doing fine with this so far. I dont understand memory timings yet. Anyone mind explaining this to me or posting good links. Thanks =P current timing in bios is 8,3,3,2.5 this normal or can it be tweaked also?
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Comments

  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    Hi warchild,

    the timings you are using now are VERY moderate, even on an Intel rig they would be.

    First of all, do you ryn the cpu and memory sync? I mean, do you run the cpu as fast as you run the memory? 1:1 , 2:2 , 3:3 etc. NOT 5:4 or 6:5 or something like that.

    When that is done, try set the timings to 11,3,2 2,5 and check for stability. If that works, go 11,3,2,2. That is CONSIDERABLY better, seceral hundred megs/s better memory bandwidth.
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    ok I set it to 11,3,3,2 and it seems to be fine...I would like to know what these mean. ok when I put say that its 11,3,3,2 that is the order i see them in my mb bios
    SDRAM Active Precharge Delay=11
    SDRAM to CAS=3
    SDRAM Precharge Delay=3
    SDRAM CAS Latency=2t

    ok now how did memory benefit from going 8 to 11 in the first one and what does it mean...does goin higher up mean faster or? My mb manual couldnt be more vague about these terms and how they affect memory performance. Thanks for your time =P
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    There are a lot of myths about ram timings on different chipsets and i wouldn't be the right person to try and tell them all. I know that there are a few very good articles about timings and what they mean. All i am interested in is memory bandwidth and how to achieve it and believe me, i have gone through a few cmos resets in my days. :D

    Try 11,3,2,2 next.
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    When I did the second change ( 11,3,3,2 == from 11,3,3,2.5) my 3dmark went up a little..which is a postive sign I take it..? =) however upon trying the second 11,3,2,2 my 3dmark score went back down. I shouldve prob let you know that I only have 1 stick of memory I dont have the dual thing going on....could that be the cause of lower score...and is 3dmark what I should be testing ? Thx again
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    Weird, very strange. Must have been a 3dmark glitch.
    If you download Sisoft Sandra, you can measure the memory bandwidth. Try 11,2,2,2 next. Must be good 2700 memorys you have there.
  • ClutchClutch North Carolina New
    edited November 2003
    I'm running my Kingston Hyper X at 2.5-3-3-7 which is the aggressive settings on my NF7-s

    oh btw-- 2 sticks of 256mb 3200
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    Clutch, at what fsb?

    Those sticks will easily do 5,2,2,2 at 200.
  • Mt_GoatMt_Goat Head Cheezy Knob Pflugerville (north of Austin) Icrontian
    edited November 2003
    Yeah, they should run close to my Corsair 3200C2. I have had it up to 230fsb @ 5-2-2-2 which I though to be quite impressive.
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    mtgoat had this to say
    Yeah, they should run close to my Corsair 3200C2. I have had it up to 230fsb @ 5-2-2-2 which I though to be quite impressive.

    VERY impressive i must say.
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    Mackanz had this to say
    Weird, very strange. Must have been a 3dmark glitch.
    If you download Sisoft Sandra, you can measure the memory bandwidth. Try 11,2,2,2 next. Must be good 2700 memorys you have there.
    Ive got 3200 ill give it another try and run the Sandra. =P What about the memory frequency my choices are:
    SPD, 50%,60,66,75,80,85,100,120,125,133,150,166,200,auto

    Also cpu interface I can choose either= optimal/aggresive?

    Memory Bandwidth Bench Mark
    RAM Bandwith Int Buffered aEMMX/aSSE=2946 mb/s
    RAM Bandwith Float Buffered aEMMX/aSSE=2713 mb/s

    Int Bandwidth Effency=92% estimated
    Float =84%

    *this is at the suggested 11,3,2,2 btw Ive got Memory Frequency=Auto @ cpu interface set at optimal
    Are things looking good/bad here ? running fine so far =P
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    Looks about right for 200 fsb at those timings so leave the frequency the way it is. Looks like sync to me. What is fastest, Optimal or Agressive? It's either on or off on my board. Memory frequency auto and 100 should be exactly the same but you could always try 100 instead. Good job!
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited November 2003
    Optimal = Stability, Aggressive = tuned for performance but slight risk of less stability. Should see *small* improvements from using Aggressive, virtually no risk - if a problem, just set back to Optimal.
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    If it makes the same difference as on the NF7, DEFINATLY set it to Agressive. Cpu interface on, on the NF7 is almost a must.
  • DisvengeanceDisvengeance
    edited November 2003
    Sorry to intrude with my question

    my corsair xms pc3200 is right now at 2,3,3,6 and when i set it to 2,2,2,5 it doesnt load windows, perhaps more volts?
  • WuGgaRoOWuGgaRoO Not in the shower Icrontian
    edited November 2003
    id say up the voltage...u can run ram with extra voltage quiote easily withu it messing up....but nothing ovver *.75....
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited November 2003
    Corsair will soak up 3.1v and higher (Maybe 3.3v) without even flinching.
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    They can eat way over 3 volts without a hickup. Infact, they like it.

    I have never used below max available vmem on any mainboard i have. No point. Ram doesn't get warm anyway.
  • MJOMJO Denmark New
    edited November 2003
    I read this on another forum.
    As for the memory timings spoken about before when someone said that 2 2 2 6 was better well they dont have an NForce2 running Dual, if they do set it to 2 2 2 11 and be amazed.

    What is this all about?
    I thought lower was better?
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited November 2003
    It's about finding the sweet spot.

    Personally I've tried 5-11, and no diff.
  • MJOMJO Denmark New
    edited November 2003
    Thought so.
    But this "outburst" puzzled me.

    Found the "tidbit" in a heated discussion in AMD's official forums.
    Seems that multiplier lock, or no multiplier lock is the question these days.
  • edcentricedcentric near Milwaukee, Wisconsin Icrontian
    edited November 2003
    When testing setting you might want to run Sandra without the buffering. The raw scores are lower, but they only reflect actual read/write. This is a good way to sort out settings.
    In general lower is better, but in some mobo/mem situations timming is an issue and slightly raising some of hte settings can actually help. As long as the CAS is kept at 2.
  • MJOMJO Denmark New
    edited November 2003
    My ram is at 2.0-2-2-6 @ 200Mhz FSB.
    It is Corsair PC3200 XMS

    I turned of buffering and scored 2319/1538 in Sandra
    With buffering on the score is 2987/2798
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    I get 11-3-2-2 runs fine but soon as I try to go 11-2-2-2 it wont even load windows...?? =/ anyone have any ideas ? :banghead:
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    You have Winbond CH5. That's why.
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    What is that......ill google it but just in case i dont see it..haha mind posting what it is here??
    thx man!! btw I took your advice and got two sticks of 256 instead of the 512....weeeeee =P
  • ketoketo Occupied. Or is it preoccupied? Icrontian
    edited November 2003
    Winbond is the actual manufacturer of the memory CHIPS. In the current generation of DDR Memory, they first released BH5 coded (their manufacturing code) modules then later on CH5. Many OEM memory manufacturers, including but not limited to Corsair OCZ Buffalo Mushkin etc, have used both modules. BH5 is found in general to clock a little higher with the tightest of timings 2-2-2-5. Some reports I have read state that CH5 has an onboard voltage regulator limiting it (2.8v?) but in any case, they're still fast modules but not *quite* as good as the BH5.
  • W4R-H1LDW4R-H1LD Chesterfield VA
    edited November 2003
    Thank ya for the info!!! so what would be the best timing considering the memory that I have.....right now Ive got it set on 8,3,2,2 :scratch:
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    8,3,2,2 is pretty good if you have no-name memory that is probably rated a lot worse.

    Can you download Sisoft Sandra and run the memory benchmark and take a screenie of it?
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited November 2003
    All four sticks of Corsair (2 x 512 modules of Corsair 3500 and 2 x 256 modules of 3200) do 230 FSB at 2/2/2.

    I've done some timing tests on my NF7-S, and I can presume statistics would be similar on all nForce2 boards.

    At 3/3/3, memory efficiency was 82%.
    At 3/3/2, memory efficiency was 85%.
    At 3/2/2, memory efficiency was 86%.
    At 2/2/2, memory efficiency was 97%.

    Enabling CPU interface gave 99% efficiency.

    200MHz FSB.
  • TheLostSwedeTheLostSwede Trondheim, Norway Icrontian
    edited November 2003
    Thrax is very correct and i did some more comparisons.
    This is at 10X250 fsb and to the left, timings 10,4,4,cas 2.5 was used.

    To the right, 10,4,3cas 2.5 was used. Both passed memtest (w00t, finally 250 fsb stable)
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