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Thread: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS




  1. #101
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    You may or may not need to. What is your ram running at, and what is the spec for the ram?

  2. #102
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    @lsdmeasap, since we started discussing my memory I think it's more appropriate to continue here.
    I am attaching an Everest test screen shot. Any ideas?
    I seem to have the same memory as Merman, Corsair XMS2 2x1GB CM2x1024-6400C4.

  3. #103
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  4. #104
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    @lsdmeasap, in the few days you were "away" I was reading around and trying things.
    Please see my thread for the latest changes I've done: http://forums.tweaktown.com/f69/how-...-my-cpu-31292/
    The basic thing is that the 6400C4 memory was working as 5-5-5-18 by default at 1.95V (it should at 1.8V don't know why, voltage set at Auto).
    I also noticed that the memory is working at 357MHz instead of the 400MHz because the AMD cpus use a divider, in my case for my Athlon 4850e it's CPU/7 and the 2.5GHz cpu was giving 357MHz memory freq. I also read about that and OCed my cpu to 2750MHz (x11 ratio with 250MHz fsb, left the HT at 1GHz by setting x4 multi instead of the default x5) and by actually using DDR 667 for the memory that allowed me the divider to be CPU/7 again giving me 393MHz mem freq.
    After this the memory itself has changed to 5-5-5-15 also at 1.95V and at 1T (not 2T as before).
    But any attempt of mine to set it manually to 4-4-4-12 upping the voltage to 2.05V (closest I can get to manufacturer 2.1V without going over it) is not stable.
    Please take a look at the thread and reply to it. Thanks in advance.
    GA-MA78G-DS3H rev1.0 F6; Athlon x2 4850e 2.5GHz; Corsair XMS2 CM2x2048-6400C4 2GB kit; Seagate 250GB SATA2 16MB

  5. #105
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  6. #106
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Can you Help me..
    I've got q6600(box), MSI P35 Platinum Combo , Kingston KVR1333D3N9/2G RAM 2x2(dual channel), and I want to ask you on default (AUTO) my ram works as 1066 on 7-7-7-20, but regulary should works on 9-9-9-24 with 1333 MHz . Please tell me how to set up with or without changing the FSB or the divider..soo I can get the full potential of my ram and what's best..
    tnx to all



  7. #107
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    You will HAVE to run a FSB of at least 333 to run your ram at 1333Mhz, you can then use either 4.00A or 4.00B for 1333Mhz (333x4=1333)

    You will also have to set your ram voltage of course

  8. #108

    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    On my i7/UD4P I have noticed Memtest is not a good indicator of stability at all. A number of configurations I have found can run all night in Memtest but fail in the first 5 minutes of a Prime95 blend torture test. :(

    Also, any chance you can update this for the EX58 chips/DDR3, LSDMEASAP?

    Some things I've gathered from your postings:

    tFAW ~ 30-32
    tRC = tRAS + tRP
    tWTP = tWR + tWL + 4
    Command Rate = 2N for more stability (made Prime95 run for 3 hours longer than with the 1N setting before finding an error for me...still messing with voltages and stuff though to get completely error free)
    Last edited by demonsavatar; 04-22-2009 at 12:12 AM.
    i7 920 C0/C1 3841A
    24/7 OC: 21x183Mhz = 3.84Ghz @ stock Vcore/QPI voltages
    Thermalright Ultra-120 Extreme 1366
    3x2GB OCZ DDR1600 OCZ3P1600LV6GK
    EX58-UD4P BIOS F11
    EVGA GTX 260 Core 216 SC 55nm 896-P3-1257-AR
    Antec NEO HE 550 Power Supply

  9. #109
    Lsdmeasap's Avatar
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    Memtest86+ is a fine indicator of Memory stability only, if you are failing Prime but passing memtest then you likely have other issues such as voltages (CPU or QPI/Vtt or NB) too low or something along those lines

    Yes, when I get some time (No Clue When) I will try to update this with some more relevant info for X58. Here is some more to add to your list >>

    tWTR = Write to Read (Same Rank) - tWL + 4
    tWL = Cas Latency - 1

  10. #110
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    Default Re: Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS

    How do these look?
    I haven't been able to run a tRD of under 8 since I am using 400+ FSB. Any other timings that have to be loosen to achieve that? Or is it because of the FSB? I am now running 2.40B strap. While I was at 333MHz I could do tRD of 6 with memory@1066MHz using 3.20B strap.
    Last edited by morph; 04-28-2009 at 11:47 PM.
    GA-EP45-UD3R (F12)
    Zalman CNPS-7000C-CU
    E8400@3.6GHz
    2x2GB A-DATA Vitesta 800+ CL4 Extreme Edition @ 1066MHz@2.0V (5-5-5-15)
    Asus EN9800GT Ultimate @ 810/2000/2200
    Seagate 250GB + WD 500GB + WD 640GB
    Asus DRW 1608-P
    BenQ G2010WP
    Thermaltake TR2 500W
    Windows 7 Pro x64

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